IEC 61753-061-2:2020

Fibre optic interconnecting devices and passive components - Performance standard - Part 061-2: Single-mode fibre optic pigtailed style polarization independent isolators for category C - Controlled environments

IEC 61753-061-2:2020 contains the minimum test and measurement requirements and severities which a fibre optic isolator as specified by IEC 61202-1 satisfies in order to be categorized as meeting the requirements of isolators used in controlled environments as specified in IEC 61753-1. The requirements cover single-mode pigtailed style polarization independent isolators for category C used in controlled environments. This second edition cancels and replaces the first edition published in 2012 and constitutes a technical revision. This edition includes the following significant technical changes with respect to the previous edition:
- addition of the detail high optical power test procedures and the condition in Annex B;
- change of test conditions harmonizing with IEC 61753-1:2018;
- addition of category CHD;
- addition of the detailed measurements conditions in Annex C;
- change of clause structure accordance with the latest ISO/IEC Directives, Part 2.
The content of the corrigendum 1 (2025-05) has been included in this copy.

Dispositifs d'interconnexion et composants passifs fibroniques - Norme de performance - Partie 061-2 : Isolateurs fibroniques à fibres unimodales munis de fibres amorces non connectorisées pour la catégorie C - Environnements contrôlés

IEC 61753-061-2:2020 contient les sévérités et les exigences minimales de mesure et d'essai auxquelles un isolateur fibronique tel que spécifié dans l'IEC 61202-1 est tenu de satisfaire afin d'être considéré comme conforme aux exigences des isolateurs utilisés dans des environnements contrôlés tel que spécifié dans l'IEC 61753-1. Les exigences couvrent les isolateurs à fibres unimodales munis de fibres amorces non connectorisées pour la catégorie C utilisés dans des environnements contrôlés. Cette deuxième édition annule et remplace la première édition parue en 2012 et constitue une révision technique. Cette édition inclut les modifications techniques majeures suivantes par rapport à l'édition précédente:
- ajout des détails et des conditions des procédures d'essai à puissance optique élevée dans l'Annexe B;
- modification des conditions d'essai en harmonisation avec l'IEC 61753-1:2018;
- ajout de la catégorie CHD;
- ajout des conditions de mesure détaillées dans l'Annexe C;
- modification de la structure des articles conformément aux dernières Directives ISO/IEC, Partie 2.
Le contenu du corrigendum 1 (2025-05) a été pris en considération dans cet exemplaire.

General Information

• Status: Published
• Publication Date: 08-Apr-2020
• ICS: 33.180.10 - Fibres and cables
• Technical Committee: SC 86B - Fibre optic interconnecting devices and passive components
• Drafting Committee: WG 7 - TC 86/SC 86B/WG 7
• Current Stage: PPUB - Publication issued
• Start Date: 09-Apr-2020
• Completion Date: 08-May-2020

Relations

• Corrected By: IEC 61753-061-2:2020/COR1:2025 - Corrigendum 1 - Fibre optic interconnecting devices and passive components - Performance standard - Part 061-2: Single-mode fibre optic pigtailed style polarization independent isolators for category C - Controlled environments
• Effective Date: 26-Oct-2025
• Revises: IEC 61753-061-2:2012 - Fibre optic interconnecting devices and passive components - Performance standard - Part 061-2: Non-connectorized single-mode fibre optic pigtailed isolators for category C - Controlled environments
• Effective Date: 05-Sep-2023

Overview

IEC 61753-061-2:2020 is an IEC performance standard that specifies the minimum test and measurement requirements and severities for single‑mode fibre optic pigtailed polarization independent isolators intended for category C - controlled environments. It defines how non‑connectorized, single‑mode pigtail isolators (as specified by IEC 61202-1) should be prepared, tested and reported so they can be classified as meeting controlled‑environment performance. Edition 2.0 (2020) is a technical revision that also incorporates Corrigendum 1.

Key topics and requirements

• Scope and sample preparation
  • Applies to non‑connectorized, single‑mode, fibre‑pigtail style polarization independent isolators.
  • Samples shall be terminated on single‑mode fibres per IEC 60793-2-50 and cable formats per IEC 60794-2-50.
• Minimum tests and severities
  • Test methods referenced from the IEC 61300 series (environmental, mechanical and optical test procedures).
  • Includes examinations/measurements such as polarization dependence loss, attenuation/return loss, transient loss and polarization mode dispersion measurements in accordance with the referenced IEC procedures.
• New/updated technical content (Edition 2)
  • Annex B: detailed high optical power test procedures and conditions for forward, backward and bidirectional input tests.
  • Harmonized test conditions with IEC 61753‑1:2018.
  • Addition of category CHD and more detailed measurement conditions in Annex C.
  • Clause structure updated per the latest ISO/IEC Directives.
• Test reporting
  • Requirements for sample size, test details and the format of test reports are specified (see Tables and Annex A).

Practical applications and users

• Who uses IEC 61753-061-2:
  • Fibre optic component manufacturers (qualification and production verification of pigtailed isolators).
  • Independent test laboratories performing performance and environmental qualification.
  • Procurement, OEMs and system integrators specifying isolators for indoor/controlled environments (data centers, central offices, lab equipment, optical amplifiers).
  • Quality and reliability engineers ensuring components meet controlled‑environment performance classes.
• Practical value:
  • Ensures consistent, reproducible verification of isolator performance under mechanical, thermal, humidity and high optical power stress.
  • Facilitates vendor comparisons and procurement specifications by standardizing test methods and severities.

Related standards

• IEC 61202‑1 (Fibre optic isolator generic specification)
• IEC 61300 series (basic test and measurement procedures)
• IEC 60793‑2‑50 and IEC 60794‑2‑50 (single‑mode fibre and indoor cable family specifications)
• IEC 61753‑1 (general performance categories and environment definitions)

Keywords: IEC 61753-061-2:2020, fibre optic isolator, polarization independent isolator, single‑mode, pigtailed, controlled environments, high optical power test, IEC 61753 series.

Standards Content (Sample)

IEC 61753-061-2 ®
Edition 2.0 2020-04
REDLINE VERSION
INTERNATIONAL
STANDARD
colour
inside
Fibre optic interconnecting devices and passive components – Performance
standard –
Part 061-2: Non-connectorized Single-mode fibre optic pigtailed style
polarization independent isolators for category C – Controlled environments

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IEC 61753-061-2 ®
Edition 2.0 2020-04
REDLINE VERSION
INTERNATIONAL
STANDARD
colour
inside
Fibre optic interconnecting devices and passive components – Performance

standard –
Part 061-2: Non-connectorized Single-mode fibre optic pigtailed style

polarization independent isolators for category C – Controlled environments

INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
ICS 33.180.10 ISBN 978-2-8322-8188-8

– 2 – IEC 61753-061-2:2020 RLV © IEC 2020
CONTENTS
FOREWORD . 3
1 Scope . 5
2 Normative references . 5
3 Terms and definitions . 6
4 Test . 6
5 Test report . 7
6 Performance requirements. 7
6.1 Sample size . 7
6.2 Test details and requirements . 7
Annex A (normative) Sample size . 18
Annex B (normative) High power test procedure of fibre optic isolators . 19
B.1 General . 19
B.2 Forward input test . 19
B.2.1 Forward input test set-up . 19
B.2.2 Forward input test procedure . 19
B.3 Backward input test . 20
B.3.1 Backward input test set-up. 20
B.3.2 Backward input test procedure . 20
B.4 Both direction input test . 20
B.4.1 Both direction input test set-up . 20
B.4.2 Both direction input test procedure . 21
Annex C (informative) Example of detailed measurement conditions including test
details and requirements . 22
Bibliography . 24

Figure B.1 – Test set-up of forward input test. 19
Figure B.2 – Test set-up of the backward input test. 20
Figure B.3 – Test set-up of both direction input test . 21

Table 1 – Single-mode spectral bands . 7
Table – Test details and requirements .
Table 2 – Test details and requirements for category C . 11
HD
Table 3 – Test details and requirements for category C . 14
Table A.1 – Sample size . 18
Table C.1 – Example of detailed measurement conditions. 22
Table C.2 – Example of detailed measurement conditions for before, during (if required)
and after the environmental tests . 23

INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
FIBRE OPTIC INTERCONNECTING DEVICES AND
PASSIVE COMPONENTS – PERFORMANCE STANDARD –

Part 061-2: Non-connectorized Single-mode fibre optic pigtailed style
polarization independent isolators for category C –
Controlled environments
FOREWORD
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– 4 – IEC 61753-061-2:2020 RLV © IEC 2020
International Standard IEC 61753-061-2 has been prepared by subcommittee 86B: Fibre optic
interconnecting devices and passive components, of IEC technical committee 86: Fibre optics.
This second edition cancels and replaces the first edition published in 2012 and constitutes a
technical revision.
This edition includes the following significant technical changes with respect to the previous
edition:
a) addition of the detail high optical power test procedures and the condition in Annex B;
b) change of test conditions harmonizing with IEC 61753-1:2018;
HD
c) addition of category C ;
d) addition of the detailed measurements conditions in Annex C;
e) change of clause structure accordance with the latest ISO/IEC Directives, Part 2.
The text of this International Standard is based on the following documents:
FDIS Report on voting
86B/4270/FDIS 86B/4284/RVD
Full information on the voting for the approval of this International Standard can be found in the
report on voting indicated in the above table.
This document has been drafted in accordance with the ISO/IEC Directives, Part 2.
A list of all parts of the IEC 61753 series, published under the general title Fibre optic
interconnecting devices and passive components – Performance standard, can be found on the
IEC website.
Future standards will carry the new general title as cited above. Titles of existing standards in
this series will be updated at the time of the next edition.
The committee has decided that the contents of this document will remain unchanged until the
stability date indicated on the IEC website under "http://webstore.iec.ch" in the data related to
the specific document. At this date, the document will be
• reconfirmed,
• withdrawn,
• replaced by a revised edition, or
• amended.
IMPORTANT – The 'colour inside' logo on the cover page of this publication indicates
that it contains colours which are considered to be useful for the correct understanding
of its contents. Users should therefore print this document using a colour printer.

FIBRE OPTIC INTERCONNECTING DEVICES AND
PASSIVE COMPONENTS – PERFORMANCE STANDARD –

Part 061-2: Non-connectorized Single-mode fibre optic pigtailed style
polarization independent isolators for category C –
Controlled environments
1 Scope
This part of IEC 61753 contains the minimum test and measurement requirements and
severities which a fibre optic isolator as specified by IEC 61202-1 should satisfy satisfies in
order to be categorized as meeting the requirements of isolators used in controlled
environments as specified in IEC 61753-1. The requirements cover non-connectorized
single-mode fibre optic pigtailed style polarization independent isolators for category C used in
controlled environments.
2 Normative references
The following documents are referred to in the text in such a way that some or all of their content
constitutes requirements of this document. For dated references, only the edition cited applies.
For undated references, the latest edition of the referenced document (including any
amendments) applies.
IEC 60793-2-50:2008, Optical fibres – Part 2-50: Product specifications – Sectional
specification for class B single-mode fibres
IEC 60794-2-50, Optical fibre cables – Part 2-50: Indoor cables – Family specification for
simplex and duplex cables for use in terminated cable assemblies
IEC 61202-1, Fibre optic interconnecting devices and passive components – Fibre optic
isolators – Part 1: Generic specification
IEC 61300-2-1, Fibre optic interconnecting devices and passive components – Basic test and
measurement procedures – Part 2-1: Tests – Vibration (sinusoidal)
IEC 61300-2-4, Fibre optic interconnecting devices and passive components – Basic test and
measurement procedures – Part 2-4: Tests – Fibre/ or cable retention
IEC 61300-2-5, Fibre optic interconnecting devices and passive components – Basic test and
measurement procedures – Part 2-5: Tests – Torsion
IEC 61300-2-9, Fibre optic interconnecting devices and passive components – Basic test and
measurement procedures – Part 2-9: Tests – Shock
IEC 61300-2-14 , Fibre optic interconnecting devices and passive components – Basic test and
measurement procedures – Part 2-14: Tests – High optical power
IEC 61300-2-17, Fibre optic interconnecting devices and passive components – Basic test and
measurement procedures – Part 2-17: Tests – Cold
———————
A new third edition is due to be published.

– 6 – IEC 61753-061-2:2020 RLV © IEC 2020
IEC 61300-2-18, Fibre optic interconnecting devices and passive components – Basic test and
measurement procedures – Part 2-18: Tests – Dry heat – High temperature endurance
IEC 61300-2-19, Fibre optic interconnecting devices and passive components – Basic test and
measurement procedures – Part 2-19: Tests – Damp heat (steady state)
IEC 61300-2-22, Fibre optic interconnecting devices and passive components – Basic test and
measurement procedures – Part 2-22: Tests – Change of temperature
IEC 61300-2-42, Fibre optic interconnecting devices and passive components – Basic test and
measurement procedures – Part 2-42: Tests – Static side load for connectors strain relief
IEC 61300-2-44, Fibre optic interconnecting devices and passive components – Basic test and
measurement procedures – Part 2-44: Tests – Flexing of the strain relief of fibre optic devices
IEC 61300-3-2, Fibre optic interconnecting devices and passive components – Basic test and
measurement procedures – Part 3-2: Examinations and measurements – Polarization
dependence loss in a single-mode fibre optic device
IEC 61300-3-3, Fibre optic interconnecting devices and passive components – Basic test and
measurement procedures – Part 3-3: Examinations and measurements – Active monitoring of
changes in attenuation and return loss
IEC 61300-3-7, Fibre optic interconnecting devices and passive components – Basic test and
measurement procedures – Part 3-7: Examinations and measurements – Wavelength
dependence of attenuation and return loss of single mode components
IEC 61300-3-28, Fibre optic interconnecting devices and passive components – Basic test and
measurement procedures – Part 3-28: Examinations and measurements – Transient loss
IEC 61300-3-32, Fibre optic interconnecting devices and passive components – Basic test and
measurement procedures – Part 3-32: Examinations and measurements – Polarization mode
dispersion measurement for passive optical components
IEC TS 62627-09, Fibre optic interconnecting devices and passive components – Vocabulary
for passive optical devices
3 Terms and definitions
For the purposes of this document, the terms and definitions given in IEC 61202-1 and
IEC TS 62627-09 apply.
ISO and IEC maintain terminological databases for use in standardization at the following
addresses:
• IEC Electropedia: available at http://www.electropedia.org/
• ISO Online browsing platform: available at http://www.iso.org/obp
4 Test
All test methods are in accordance with a specific standard of the IEC 61300 series, of which
parts applicable to this document are mentioned in 6.2 (see Table 2 and Table 3).
The samples shall be terminated onto single-mode fibres as per IEC 60793-2-50:2008 category
B1.1, B1.3 or B6 B-652.B, B-652.D or B-657 in either coated fibres (primary and secondary) or
reinforced cable format as per IEC 60794-2-50.

Table 1 is intended to provide guidance on the wavelength ranges of the various spectral bands.
It is not intended for specification. Values of operating wavelength used in performance
verification shall be specified between the customer and supplier or shall be as defined in the
manufacturer’s specification.
Table 1 – Single-mode spectral bands
Band Descriptor Range
nm
O-band Original 1 260 to 1 360
E-band Extended 1 360 to 1 460
S-band Short wavelength 1 460 to 1 530
C-band Conventional 1 530 to 1 565
L-band Long wavelength 1 565 to 1 625
U-band Ultralong wavelength 1 625 to 1 675
Source: ITU-T G.Supplement 39 [1] .

5 Test report
Fully documented test reports and supporting evidence shall be prepared and be available for
inspections as evidence that the tests have been carried out and complied with.
6 Performance requirements
6.1 Sample size
Sample sizes for the tests are defined in Annex A.
6.2 Test details and requirements
A minimum length of fibre or cable of 2,0 m per port shall be included in prepared for all climatic
and environmental tests.
HD
Test details and requirements for category C and C are shown in Table 2 and Table 3,
respectively. An example of test details and requirements including detailed measurements
conditions is shown in Annex C (informative).
———————
Numbers in square brackets refer to the Bibliography

– 8 – IEC 61753-061-2:2020 RLV © IEC 2020
Table 2 – Test details and requirements
No Tests Requirements Details
1 Attenuation Launch fibre length:
≤ 0,7 dB (single stage) ≥ 2,0 m
(insertion loss)
≤ 0,8 dB (double stage) Polarization state Any polarization
IEC 61300-3-7
Measurement
± 0,1 dB
uncertainty
2 Isolation Launch fibre length:
≥20 dB (single stage) ≥ 2,0 m
IEC 61300-3-7
≥40 dB (double stage)
Polarization state Any polarization
Measurement
± 0,3 dB (single stage)
uncertainty
± 0,5 dB (double stage)
Note IEC 61300-3-7 defines the
method to measure insertion
loss. However it can apply to
the measurement of isolation,
because in the case of an
isolator, isolation is the
insertion loss measured in the
opposite direction to test no. 1
3 Return loss Launch fibre length:
≥ 55 dB ≥ 2,0 m
IEC 61300-3-7
Polarization state Any polarization

Measurement
± 1 dB
uncertainty
Note All ports not under test shall be
optically terminated to avoid
unwanted reflections
contributing to the
measurement
4 Polarization ≤ 0,10 dB (single stage) Launch fibre length: ≥2,0 m
dependent
≤ 0,15 dB (double stage) Measurement
± 0,02 dB
loss
uncertainty
IEC 61300-3-2
5 Polarization Launch fibre length:
≤0,20 ps (single stage) ≥ 2,0 m
mode dispersion
≤0,10 ps (double stage)
Measurement ± 0,05 ps
IEC 61300-3-32
uncertainty
6 High optical Before and after the test, the limits Optical power 300 mW
power of insertion loss, isolation and
Wavelength 1 550 nm
return loss of test no. 1, 2 and 3
IEC 61300-2-14
shall be met.
Duration of the optical 30 min
During the test, the insertion loss
power exposure
change is monitored. During and
after the test, the insertion loss
Temperature: 60 °C ± 2° C
change shall be within ± 0,3 dB of
the initial value.
+2
Relative humidity:
93 % RH
−3
During the test, the isolation
change is monitored. The sum of
Note A different wavelength is
the initial value and the change of
acceptable when there is a
the isolation shall be within the
negotiation between customer
value defined at test no. 2.
and supplier
During the test, the return loss
change is monitored. The sum of
the initial value and the change of
the return loss shall be within the
value defined at test no. 3
7 Cold Before and after the test, the limits Temperature: -10° C ± 2° C
of insertion loss, isolation and
IEC 61300-2-17
Duration of exposure: 96 h
return loss of test no. 1, 2 and 3

shall be met.
The insertion loss change after the
test shall be within ± 0,3 dB of the
initial value
8 High Before and after the test, the limits Temperature: +60° C ± 2° C
temperature of insertion loss, isolation and
Duration of exposure: 96 h
endurance return loss of test no. 1, 2 and 3
shall be met.
IEC 61300-2-18
The insertion loss change after the
test shall be within ± 0,3 dB of the
initial value
9 Damp heat Before and after the test, the limits Temperature: +40 ± 2 °C
of insertion loss, isolation and
(steady state)
return loss of test no. 1, 2 and 3
Relative humidity: +2
93 % RH
−3
shall be met.
IEC 61300-2-19
During the test, the insertion loss
Duration of exposure: 96 h
change is monitored. During and
after the test, the insertion loss
change shall be within ± 0,3 dB of

the initial value.
During the test, the isolation
change is monitored. The sum of
the initial value and the change of
the isolation shall be within the
value defined at test no. 2
10 Change of Before and after the test, the limits High temperature:
+60 ± 2 °C
temperature of insertion loss, isolation and
return loss of test no. 1, 2 and 3 Low temperature: -10 ± 2 °C
IEC 61300-2-22
shall be met.
Number of cycles: Cycles 5
During the test, the insertion loss
Duration at extreme 60 min
change is monitored. During and
temperature:
after the test, the insertion loss
change shall be within ± 0,3 dB of
Rate of change: 1 °C/min
the initial value.
During the test, the isolation
change is monitored. The sum of
the initial value and the change of
the isolation shall be within the
value defined at test no. 2
11 Vibration Before and after the test, the limits Frequency range: 10 Hz - 55 Hz
of insertion loss, isolation and
IEC 61300-2-1
Number of axes: 3 orthogonal axes
return loss of test no. 1, 2 and 3
shall be met.
IEC 61300-3-28
Number of sweeps: 15 /axis
During the test, the insertion loss
Sweep rate: 1 octave/min
change is monitored. During and
after the test, the insertion loss
Amplitude: 0,75 mm
change shall be within ± 0,3 dB of
the initial value.
During the test, the isolation
change is monitored. The sum of

the initial value and the change of
the isolation shall be within the
value defined at test no. 2
12 Before and after the test, the limits Acceleration: 5 000 m/s
of insertion loss, isolation and
Duration: 1 ms, half sine pulse
return loss of test no. 1, 2 and 3
shall be met.
Number of axis: 3 axes in 2 directions
The insertion loss change after the
Number of shocks: 2 shocks per axis, 12 shock
test shall be within ± 0,3 dB of the
in total
initial value
13 Optical fibre Before and after the test, the limits Tensile force: 2 N for reinforced cable

– 10 – IEC 61753-061-2:2020 RLV © IEC 2020
cable flexing of insertion loss, isolation and
Number of cycles: 30 cycles ± 90°
return loss of test no. 1, 2 and 3
IEC 61300-2-44
shall be met.
The insertion loss change after the
test shall be within ± 0,3 dB of the
initial value
14 Fibre/cable Before and after the test, the limits Magnitude and rate of
(10 ± 1) N at 5 N/s for reinforced
retention of insertion loss, isolation and application: cables.
return loss of test no. 1, 2 and 3
IEC 61300-2-4
(5,0 ± 0,5) N at 0,5 N/s for
shall be met.
secondary coated fibres.
The insertion loss change after the
(2,0 ± 0,2) N at 0,5 N/s for
test shall be within ± 0,3 dB of the
initial value primary coated fibres.
Duration of the test 120 s duration at 10 N.
60 s duration at 2 N or 5 N.
Point of application of 0,3 m from the exit point of the
tensile load: fibre / cable from the specimen.
Method of mounting: The sample shall be rigidly
mounted such that the load is
only applied to the fibre/cable
retention mechanism
15 Static side load Before and after the test, the limits Magnitude and 1 N for 1 h for reinforced cable
of insertion loss, isolation and duration of the tensile
IEC 61300-2-42 0,2 N for 5 min for secondary
return loss of test no. 1, 2 and 3 load:
coated fibres
shall be met.
Direction of Two mutually perpendicular
The insertion loss change after the
application: directions
test shall be within ± 0,3 dB of the
initial value
Table 2 – Test details and requirements for category C
No Tests Requirements Details
1 Insertion loss ≤ 0,7 dB (single stage) Launch fibre length: ≥ 2,0 m
(attenuation)
≤ 0,8 dB (double stage)
Condition: Insertion loss (attenuation) shall be
IEC 61300-3-7
met over operating wavelength
range and all state of polarization
IEC 61300-3-2
(SOP).
Refer Table C.1,
Measurement ≤ 0,1 dB
No.1.
uncertainty:
2 Isolation ≥ 20 dB (single stage) Launch fibre length: ≥ 2,0 m
IEC 61300-3-7 ≥ 40 dB (double stage) Isolation shall be met over
Condition:
operating wavelength range and all
IEC 61300-3-2
SOP.
Refer Table C.1,
Measurement
≤ 0,3 dB (single stage)
No.2.
uncertainty:
≤ 0,5 dB (double stage)
NOTE IEC 61300-3-7 is the test
method to measure the wavelength
dependence of attenuation.
However, it can apply to the
measurement of isolation, because
in the case of an isolator, isolation
is the wavelength dependent
attenuation measured in the
opposite direction to test no. 1.
3 Return loss ≥ 55 dB Launch fibre length: ≥ 2,0 m
IEC 61300-3-7 Condition: Return loss shall be met over
operating wavelength range.
Refer Table C.1,
No.3.
Measurement ≤ 1 dB
uncertainty:
The port not under test shall be
optically terminated to avoid
unwanted reflections contributing to
the measurement.
4 Polarization ≤ 0,10 dB (single stage) Launch fibre length: ≥ 2,0 m
dependent
≤ 0,15 dB (double stage) Condition: PDL shall be met over operating
loss
wavelength range.
PDL
Measurement ≤ 0,02 dB
IEC 61300-3-2
uncertainty:
5 Polarization ≤ 0,20 ps (single stage) Launch fibre length: ≥ 2,0 m
mode dispersion
≤ 0,10 ps (double stage)
Measurement ≤ 0,05 ps
PMD
uncertainty:
IEC 61300-3-32
– 12 – IEC 61753-061-2:2020 RLV © IEC 2020
No Tests Requirements Details
6 High optical Before and after the test, the Test set-up and Annex B
power limits of insertion loss procedure:
(attenuation), isolation, return
IEC 61300-2-14 Optical power: 300 mW
loss and PDL of test no. 1, 2, 3
and 4 shall be met.
IEC 61300-3-3
SOP of the light Average SOP (depolarized)
source:
During the forward input test,
Refer Annex B.
the insertion loss (attenuation)
Wavelength: 1 550 nm for C-band
change is monitored. During
and after the test, the insertion
1 580 nm for L-band
loss change shall be within
NOTE A different wavelength is
±0,3 dB of the initial value.
acceptable when there is a
During the backward input test,
negotiation between customer and
the isolation change is
supplier.
monitored. The sum of the
Duration of the
30 min
initial value and the change of
optical power
the isolation shall be within the
exposure:
value defined at test no. 2.
Temperature: 60 °C ± 2 °C
During the forward input test,
the return loss change is
Relative humidity: +2
93 % RH
monitored. The sum of the
−3
initial value and the change of
the return loss shall be within
NOTE This test condition focuses
the value defined at test no. 3.
to standard optical isolators.
The insertion loss
(attenuation), isolation and
return loss shall be measured
after launching an optical
power of 300 mW
simultaneously in both forward
and backward directions. After
the test, the insertion loss
change shall be within ±0,3 dB
of the initial value. After the
test, the sum of the initial value
and the change of the isolation
shall be within the value
defined at test no. 2. After the
test, the sum of the initial value
and the change of the return
loss shall be within the value
defined at test no. 3.
7 Cold Before and after the test, the Temperature: −10 °C ± 2 °C
limits of insertion loss
IEC 61300-2-17
Duration of 96 h
(attenuation), isolation, return
exposure:
loss and PDL of test no. 1, 2, 3
and 4 shall be met.
The insertion loss change after
the test shall be within ±0,3 dB
of the initial value.
8 Dry heat – High Before and after the test, the Temperature: +60 °C ± 2 °C
temperature limits of insertion loss
Duration of 96 h
endurance (attenuation), isolation, return
exposure:
loss and PDL of test no. 1, 2, 3
IEC 61300-2-18
and 4 shall be met.
The insertion loss (attenuation)
change after the test shall be
within ±0,3 dB of the initial
value.
9 Damp heat Before and after the test, the Temperature: +40°C ± 2 °C
(steady state) limits of insertion loss
Relative humidity: +2
93 % RH
(attenuation), isolation, return
−3
IEC 61300-2-19
loss and PDL of test no. 1, 2, 3
and 4 shall be met.
IEC 61300-3-3 Duration of 96 h
exposure:
During and after the test, the
Refer Annex C
insertion loss (attenuation)
change shall be within ±0,3 dB
of the initial value.
No Tests Requirements Details
10 Change of Before and after the test, the High temperature: +60°C ± 2 °C
temperature limits of insertion loss
Low temperature: −10°C ± 2 °C
(attenuation), isolation, return
IEC 61300-2-22
loss and PDL of test no. 1, 2, 3
Number of cycles: Cycles 5
and 4 shall be met.
IEC 61300-3-3
Duration at extreme 60 min
During and after the test, the
Refer Annex C
temperature:
insertion loss (attenuation)
change shall be within ±0,3 dB
Rate of change: 1 °C /min
of the initial value.
The sum of the initial value and
the change of the isolation shall
be within the value defined at
test no. 2.
Before and after the test, the
11 Vibration Frequency range: 10 Hz to 55 Hz
limits of insertion loss
IEC 61300-2-1 Number of axes: 3 orthogonal axes
(attenuation), isolation, return
loss and PDL of test no. 1, 2, 3
IEC 61300-3-28
Number of sweeps: 15 /axis
and 4 shall be met.
Refer Annex C
Sweep rate: 1 octave/min
During and after the test, the
insertion loss (attenuation)
Amplitude: 0,75 mm
change shall be within ±0,3 dB
of the initial value.
12 Shock Before and after the test, the Acceleration: 5 000 m/s
limits of insertion loss
IEC 61300-2-9 Duration: 1 ms, half sine pulse
(attenuation) , isolation, return
loss and PDL of test no. 1, 2, 3
Number of axis: 3 axes in 2 directions
and 4 shall be met.
Number of shocks: 2 shocks per axis, 12 shocks
The insertion loss change after
in total
the test shall be within ±0,3 dB
of the initial value.
Flexing of the Before and after the test, the Tensile force: 2 N for reinforced cable
strain relief of limits of insertion loss
Number of cycles: 50 cycles
fibre optic (attenuation), isolation, return
devices loss and PDL of test no. 1, 2, 3 Angle: ±90°
IEC 61300-2-44 and 4 shall be met.
The insertion loss (attenuation)
change after the test shall be
within ±0,3 dB of the initial
value
Fibre/cable Before and after the test, the Magnitude and rate 10 N ± 1 N at 5 N/s for reinforced
retention limits of insertion loss of application: cables
(attenuation), isolation and
IEC 61300-2-4 5,0 N ± 0,5 N at 0,5 N/s for
return loss of test no. 1, 2, 3
secondary coated fibres
and 4 shall be met.
2,0 N ± 0,2 N at 0,5 N/s for primary
During and after the test,
coated fibres
insertion loss (attenuation)
change shall be within ±0,3 dB
Duration of the test: 60 s
of the initial value.
Before and after the test, the Magnitude and
15 Static side load 1 N for 1 h for reinforced cable
limits of insertion loss duration of the
IEC 61300-2-42 0,2 N for 5 min for secondary
(attenuation), isolation, return tensile load:
coated fibres
loss and PDL of test no. 1, 2, 3
and 4 shall be met. Direction of Two mutually perpendicular
application: directions
The insertion loss change after
the test shall be within ±0,3 dB
of the initial value.
Before and after the test, the Magnitude of the
16 Torsion Load: 5 N for cables
limits of insertion loss torsion/twist:
IEC 61300-2-5 2,0 N for primary coated and
(attenuation), isolation, return
buffered fibres
loss and PDL of test no. 1, 2, 3
and 4 shall be met. Angle and cycles: Angle: ±180°
The insertion loss (attenuation) Number of cycles: 10
change after the test shall be
Fibre/cable clamping distance:
Test condition:
within ±0,3 dB of the initial
25 cm ± 5 cm
value.
– 14 – IEC 61753-061-2:2020 RLV © IEC 2020
HD
Table 3 – Test details and requirements for category C
No Tests Requirements Details
1 Insertion loss ≤ 0,7 dB (single stage) Launch fibre length: ≥ 2,0 m
(attenuation) ≤ 0,8 dB (double stage) Condition: Attenuation (insertion loss) shall be
met over operating wavelength
IEC 61300-3-7
range and all state of polarization
(SOP).
IEC 61300-3-2
Measurement ≤ 0,1 dB
Refer Table C.1,
uncertainty:
No.1.
2 Isolation ≥ 20 dB (single stage) Launch fibre length: ≥ 2,0 m
IEC 61300-3-7 ≥ 40 dB (double stage) Condition: Isolation shall be met over
operating wavelength range and all
IEC 61300-3-2
SOP.
Refer Table C.1,
Measurement ≤ 0,3 dB (single stage)
No.2.
uncertainty:
≤ 0,5 dB (double stage)
NOTE IEC 61300-3-7 defines the
method to measure insertion loss.
However, it can apply to the
measurement of isolation, because
in the case of an isolator, isolation
is the insertion loss measured in the
opposite direction to test no. 1.
3 Return loss ≥ 55 dB Launch fibre length: ≥ 2,0 m
IEC 61300-3-7
Condition: Return loss shall be met over
operating wavelength range.
Refer Table C.1,
No.3.
Measurement ≤ 1 dB
uncertainty:
The port not under test shall be
optically terminated to avoid
unwanted reflections contributing to
the measurement
4 Polarization ≤ 0,10 dB (single stage) Launch fibre length: ≥ 2,0 m
dependent loss
≤ 0,15 dB (double stage)
Condition: PDL shall be met over operating
IEC 61300-3-2
wavelength range.
Measurement ≤ 0,02 dB
uncertainty:
5 Polarization ≤ 0,20 ps (single stage) Launch fibre length: ≥ 2,0 m
mode dispersion
≤ 0,10 ps (double stage)
Measurement ≤ 0,05 ps
IEC 61300-3-32
uncertainty:
No Tests Requirements Details
6 High optical Before and after the test, the Test set-up and Annex B
power limits of insertion loss procedure:
(attenuation), isolation, return
IEC 61300-2-14
Optical power: 300 mW
loss and PDL of test no. 1, 2, 3
and 4 shall be met.
IEC 61300-3-3
SOP of the light Average SOP (depolarized)
source:
During the forward input test,
Refer Annex B.
the insertion loss (attenuaton)
Wavelength: 1 550 nm for C-band
change is monitored. During
and after the test, the insertion
1 580 nm for L-band
loss (attenuation) change shall
NOTE A different wavelength is
be within ±0,3 dB of the initial
acceptable when there is a
value.
negotiation between customer and
During the backward input test,
supplier
the isolation change is
Duration of the 30 min
monitored. The sum of the
optical power
initial value and the change of
the isolation shall be within the exposure:
value defined at test no. 2.
Temperature: 60 °C ± 2 °C
During the forward input test,
Relative humidity: +2
93 % RH
the return loss change is
−3
monitored. The sum of the
initial value and the change of

NOTE Thiis test condition focuses
the return loss shall be within
to standard optical isolators.
the value defined at test no. 3.
The insertion loss
(attenuation), isolation and
return loss shall be measured
after launching an optical
power of 300 mW
simultaneously in both forward
and backward directions. After
the test, the insertion loss
(attenuation) change shall be
within ±0,3 dB of the initial
value. After the test, the sum of
the initial value and the change
of the isolation shall be within
the value defined at test no. 2.
After the test, the sum of the
initial value and the change of
the return loss shall be within
the value defined at test no. 3.
7 Cold Before and after the test, the Temperature: −10 °C ± 2 °C
limits of insertion loss
IEC 61300-2-17
Duration of 96 h
(attenuation), isolation, return
exposure:
loss and PDL of test no. 1, 2, 3
and 4 shall be met.
The insertion loss (attenuation)
change after the test shall be
within ±0,3 dB of the initial
value.
8 High temperature Before and after the test, the Temperature: +70 °C ± 2 °C
endurance limits of insertion loss
Duration of 96 h
(attenuation), isolation, return
IEC 61300-2-18
exposure:
loss and PDL of test no. 1, 2, 3
and 4 shall be met.
The insertion loss (attenuation)
change after the test shall be
within ±0,3 dB of the initial
value.
– 16 – IEC 61753-061-2:2020 RLV © IEC 2020
No Tests Requirements Details
9 Damp heat Before and after the test, the Temperature: +40°C ± 2 °C
(steady state) limits of insertion loss
+2
Relative humidity:
(attenuation), isolation, return 93 % RH
−3
IEC 61300-2-19
loss and PDL of test no. 1, 2, 3
and 4 shall be met.
IEC 61300-3-3 Duration of 96 h
exposure:
During and after the test, the
Reger Annex C
insertion loss (attenuation)
change shall be within ±0,3 dB
of the initial value.
10 Change of Before and after the test, the High temperature: +70°C ± 2 °C
temperature limits of insertion loss
Low temperature: −10°C ± 2 °C
(attenuaton), isolation, return
IEC 61300-2-22
loss and PDL of test no. 1, 2, 3
Number of cycles: Cycles 5
and 4 shall be met.
IEC 61300-3-3
Duration at extreme 60 min
During and after the test, the
Refer Annex C
temperature:
insertion loss (attenuation)
change shall be within ±0,3 dB
Rate of change: 1 °C/min
of the initial value.
The sum of the initial value and
the change of the isolation shall
be within the value defined at
test no. 2.
11 Vibration Before and after the test, the Frequency range: 10 Hz to 55 Hz
limits of insertion loss
IEC 61300-2-1
Number of axes: 3 orthogonal axes
(attenuation), isolation, return
loss and PDL of test no. 1, 2, 3
IEC 61300-3-28
Number of sweeps: 15 /axis
and 4 shall be met.
Refer Annex C.
Sweep rate: 1 octave/min
During and after the test, the
insertion loss (attenuation)
Amplitude: 0,75 mm
change shall be within ±0,3 dB
of the initial value.
12 Shock Before and after the test, the Acceleration: 5 000 m/s
limits of insertion loss
IEC 61300-2-9 Duration: 1 ms, half sine pulse
(attenuation), isolation, return
loss and PDL of test no. 1, 2, 3
Number of axis: 3 axes in 2 directions
and 4 shall be met.
Number of shocks: 2 shocks per axis, 12 shocks
The insertion loss (attenuation)
in total
change after the test shall be
within ±0,3 dB of the initial
value.
13 Flexing of the Before and after the test, the Tensile force: 2 N for reinforced cable
strain relief of limits of insertion loss
Number of cycles: 50 cycles
fibre optic (attenuation), isolation, return
devices loss and PDL of test no. 1, 2, 3
Angle: ±90°
IEC 61300-2-44 and 4 shall be met.
The insertion loss change after
the test shall be within ±0,3 dB
of the initial value
14 Fibre/cable Before and after the test, the Magnitude and rate 10 N ± 1 N at 5 N/s for reinforced
retention limits of insertion loss of application: cables
(attenuation), isolation and
IEC 61300-2-4 5,0 N ± 0,5 N at 0,5 N/s for
return loss of test no. 1, 2, 3
secondary coated fibres
and 4 shall be met.
2,0 N ± ,2 N at 0,5 N/s for primary
During and after the test,
coated fibres
insertion loss (attenuation)
change shall be within ±0,3 dB
Duration of the test: 60 s
of the initial value.
No Tests Requirements Details
15 Static side load Before and after the test, the Magnitude and 1 N for 1 h for reinforced cable
limits of insertion loss duration of the
IEC 61300-2-42 0,2 N for 5 min for secondary
(attenuation), isolation, return tensile load:
coated fibres
loss and PDL of test no. 1, 2, 3
and 4 shall be met.
Direction of Two mutually perpendicular
application: directions
The insertion loss (attenuation)
change after the test shall be
within ±0,3 dB of the initial
value.
16 Torsion Before and after the test, the Magnitude of the Load: 5 N for cables
limits of insertion loss torsion/twist:
IEC 61300-2-5 2,0 N for primary coated and
(attenuation), isolation, return
buffered fibres
loss and PDL of test no. 1, 2, 3
and 4 shall be met.
Angle and cycles: Angle: ±180°
The insertion loss (attenuation)
Number of cycles: 10
change after the test shall be
within ±0,3 dB of the initial
Test condition: Fibre/cable clamping distance:
value.
25 cm ± 5 cm
– 18 – IEC 61753-061-2:2020 RLV © IEC 2020
Annex A
(normative)
Sample size
The
...

IEC 61753-061-2 ®
Edition 2.0 2020-04
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
Fibre optic interconnecting devices and passive components – Performance
standard –
Part 061-2: Single-mode fibre optic pigtailed style polarization independent
isolators for category C – Controlled environments

Dispositifs d'interconnexion et composants passifs fibroniques – Norme de
performance –
Partie 061-2: Isolateurs fibroniques à fibres unimodales munis de fibres amorces
non connectorisées pour la catégorie C – Environnements contrôlés

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IEC 61753-061-2 ®
Edition 2.0 2020-04
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
Fibre optic interconnecting devices and passive components – Performance

standard –
Part 061-2: Single-mode fibre optic pigtailed style polarization independent

isolators for category C – Controlled environments

Dispositifs d'interconnexion et composants passifs fibroniques – Norme de

performance –
Partie 061-2: Isolateurs fibroniques à fibres unimodales munis de fibres amorces

non connectorisées pour la catégorie C – Environnements contrôlés

INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
INTERNATIONALE
ICS 33.180.10 ISBN 978-2-8322-8108-6

– 2 – IEC 61753-061-2:2020 © IEC 2020
CONTENTS
FOREWORD . 3
1 Scope . 5
2 Normative references . 5
3 Terms and definitions . 6
4 Test . 6
5 Test report . 7
6 Performance requirements. 7
6.1 Sample size . 7
6.2 Test details and requirements . 7
Annex A (normative) Sample size . 15
Annex B (normative) High power test procedure of fibre optic isolators . 16
B.1 General . 16
B.2 Forward input test . 16
B.2.1 Forward input test set-up . 16
B.2.2 Forward input test procedure . 16
B.3 Backward input test . 17
B.3.1 Backward input test set-up. 17
B.3.2 Backward input test procedure . 17
B.4 Both direction input test . 17
B.4.1 Both direction input test set-up . 17
B.4.2 Both direction input test procedure . 18
Annex C (informative) Example of detailed measurement conditions including test
details and requirements . 19
Bibliography . 21

Figure B.1 – Test set-up of forward input test. 16
Figure B.2 – Test set-up of the backward input test. 17
Figure B.3 – Test set-up of both direction input test . 18

Table 1 – Single-mode spectral bands . 7
Table 2 – Test details and requirements for category C . 8
HD
Table 3 – Test details and requirements for category C . 11
Table A.1 – Sample size . 15
Table C.1 – Example of detailed measurement conditions. 19
Table C.2 – Example of detailed measurement conditions for before, during (if required)
and after the environmental tests . 20

INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
FIBRE OPTIC INTERCONNECTING DEVICES AND
PASSIVE COMPONENTS – PERFORMANCE STANDARD –

Part 061-2: Single-mode fibre optic pigtailed style
polarization independent isolators for category C –
Controlled environments
FOREWORD
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9) Attention is drawn to the possibility that some of the elements of this IEC Publication may be the subject of patent
rights. IEC shall not be held responsible for identifying any or all such patent rights.
International Standard IEC 61753-061-2 has been prepared by subcommittee 86B: Fibre optic
interconnecting devices and passive components, of IEC technical committee 86: Fibre optics.
This second edition cancels and replaces the first edition published in 2012 and constitutes a
technical revision.
This edition includes the following significant technical changes with respect to the previous
edition:
a) addition of the detail high optical power test procedures and the condition in Annex B;
b) change of test conditions harmonizing with IEC 61753-1:2018;
HD
c) addition of category C ;
d) addition of the detailed measurements conditions in Annex C;
e) change of clause structure accordance with the latest ISO/IEC Directives, Part 2.

– 4 – IEC 61753-061-2:2020 © IEC 2020
The text of this International Standard is based on the following documents:
FDIS Report on voting
86B/4270/FDIS 86B/4284/RVD
Full information on the voting for the approval of this International Standard can be found in the
report on voting indicated in the above table.
This document has been drafted in accordance with the ISO/IEC Directives, Part 2.
A list of all parts of the IEC 61753 series, published under the general title Fibre optic
interconnecting devices and passive components – Performance standard, can be found on the
IEC website.
Future standards will carry the new general title as cited above. Titles of existing standards in
this series will be updated at the time of the next edition.
The committee has decided that the contents of this document will remain unchanged until the
stability date indicated on the IEC website under "http://webstore.iec.ch" in the data related to
the specific document. At this date, the document will be
• reconfirmed,
• withdrawn,
• replaced by a revised edition, or
• amended.
FIBRE OPTIC INTERCONNECTING DEVICES AND
PASSIVE COMPONENTS – PERFORMANCE STANDARD –

Part 061-2: Single-mode fibre optic pigtailed style
polarization independent isolators for category C –
Controlled environments
1 Scope
This part of IEC 61753 contains the minimum test and measurement requirements and
severities which a fibre optic isolator as specified by IEC 61202-1 satisfies in order to be
categorized as meeting the requirements of isolators used in controlled environments as
specified in IEC 61753-1. The requirements cover single-mode pigtailed style polarization
independent isolators for category C used in controlled environments.
2 Normative references
The following documents are referred to in the text in such a way that some or all of their content
constitutes requirements of this document. For dated references, only the edition cited applies.
For undated references, the latest edition of the referenced document (including any
amendments) applies.
IEC 60793-2-50, Optical fibres – Part 2-50: Product specifications – Sectional specification for
class B single-mode fibres
IEC 60794-2-50, Optical fibre cables – Part 2-50: Indoor cables – Family specification for
simplex and duplex cables for use in terminated cable assemblies
IEC 61202-1, Fibre optic interconnecting devices and passive components – Fibre optic
isolators – Part 1: Generic specification
IEC 61300-2-1, Fibre optic interconnecting devices and passive components – Basic test and
measurement procedures – Part 2-1: Tests – Vibration (sinusoidal)
IEC 61300-2-4, Fibre optic interconnecting devices and passive components – Basic test and
measurement procedures – Part 2-4: Tests – Fibre or cable retention
IEC 61300-2-5, Fibre optic interconnecting devices and passive components – Basic test and
measurement procedures – Part 2-5: Tests – Torsion
IEC 61300-2-9, Fibre optic interconnecting devices and passive components – Basic test and
measurement procedures – Part 2-9: Tests – Shock
IEC 61300-2-14, Fibre optic interconnecting devices and passive components – Basic test and
measurement procedures – Part 2-14: Tests – High optical power
IEC 61300-2-17, Fibre optic interconnecting devices and passive components – Basic test and
measurement procedures – Part 2-17: Tests – Cold
IEC 61300-2-18, Fibre optic interconnecting devices and passive components – Basic test and
measurement procedures – Part 2-18: Tests – Dry heat – High temperature endurance

– 6 – IEC 61753-061-2:2020 © IEC 2020
IEC 61300-2-19, Fibre optic interconnecting devices and passive components – Basic test and
measurement procedures – Part 2-19: Tests – Damp heat (steady state)
IEC 61300-2-22, Fibre optic interconnecting devices and passive components – Basic test and
measurement procedures – Part 2-22: Tests – Change of temperature
IEC 61300-2-42, Fibre optic interconnecting devices and passive components – Basic test and
measurement procedures – Part 2-42: Tests – Static side load for strain relief
IEC 61300-2-44, Fibre optic interconnecting devices and passive components – Basic test and
measurement procedures – Part 2-44: Tests – Flexing of the strain relief of fibre optic devices
IEC 61300-3-2, Fibre optic interconnecting devices and passive components – Basic test and
measurement procedures – Part 3-2: Examinations and measurements – Polarization
dependence loss in a single-mode fibre optic device
IEC 61300-3-3, Fibre optic interconnecting devices and passive components – Basic test and
measurement procedures – Part 3-3: Examinations and measurements – Active monitoring of
changes in attenuation and return loss
IEC 61300-3-7, Fibre optic interconnecting devices and passive components – Basic test and
measurement procedures – Part 3-7: Examinations and measurements – Wavelength
dependence of attenuation and return loss of single mode components
IEC 61300-3-28, Fibre optic interconnecting devices and passive components – Basic test and
measurement procedures – Part 3-28: Examinations and measurements – Transient loss
IEC 61300-3-32, Fibre optic interconnecting devices and passive components – Basic test and
measurement procedures – Part 3-32: Examinations and measurements – Polarization mode
dispersion measurement for passive optical components
IEC TS 62627-09, Fibre optic interconnecting devices and passive components – Vocabulary
for passive optical devices
3 Terms and definitions
For the purposes of this document, the terms and definitions given in IEC 61202-1 and
IEC TS 62627-09 apply.
ISO and IEC maintain terminological databases for use in standardization at the following
addresses:
• IEC Electropedia: available at http://www.electropedia.org/
• ISO Online browsing platform: available at http://www.iso.org/obp
4 Test
All test methods are in accordance with a specific standard of the IEC 61300 series, of which
parts applicable to this document are mentioned in 6.2 (see Table 2 and Table 3).
The samples shall be terminated onto single-mode fibres as per IEC 60793-2-50 category
B-652.B, B-652.D or B-657 in either coated fibres (primary and secondary) or reinforced cable
format as per IEC 60794-2-50.
Table 1 is intended to provide guidance on the wavelength ranges of the various spectral bands.
It is not intended for specification. Values of operating wavelength used in performance
verification shall be specified between the customer and supplier or shall be as defined in the
manufacturer’s specification.
Table 1 – Single-mode spectral bands
Band Descriptor Range
nm
O-band Original 1 260 to 1 360
E-band Extended 1 360 to 1 460
S-band Short wavelength 1 460 to 1 530
C-band Conventional 1 530 to 1 565
L-band Long wavelength 1 565 to 1 625
U-band Ultralong wavelength 1 625 to 1 675
Source: ITU-T G.Supplement 39.

5 Test report
Fully documented test reports and supporting evidence shall be prepared and be available for
inspections as evidence that the tests have been carried out and complied with.
6 Performance requirements
6.1 Sample size
Sample sizes for the tests are defined in Annex A.
6.2 Test details and requirements
A minimum length of fibre or cable of 2,0 m per port shall be prepared for all tests.
HD
Test details and requirements for category C and C are shown in Table 2 and Table 3,
respectively. An example of test details and requirements including detailed measurements
conditions is shown in Annex C (informative).

– 8 – IEC 61753-061-2:2020 © IEC 2020
Table 2 – Test details and requirements for category C
No Tests Requirements Details
1 Insertion loss ≤ 0,7 dB (single stage) Launch fibre length: ≥ 2,0 m
(attenuation)
≤ 0,8 dB (double stage) Insertion loss (attenuation) shall be
Condition:
IEC 61300-3-7
met over operating wavelength
range and all state of polarization
IEC 61300-3-2
(SOP).
Refer Table C.1,
Measurement ≤ 0,1 dB
No.1.
uncertainty:
2 Isolation ≥ 20 dB (single stage) Launch fibre length: ≥ 2,0 m
IEC 61300-3-7 ≥ 40 dB (double stage) Condition: Isolation shall be met over
operating wavelength range and all
IEC 61300-3-2
SOP.
Refer Table C.1,
Measurement ≤ 0,3 dB (single stage)
No.2.
uncertainty:
≤ 0,5 dB (double stage)
NOTE IEC 61300-3-7 is the test

method to measure the wavelength
dependence of attenuation.
However, it can apply to the
measurement of isolation, because
in the case of an isolator, isolation
is the wavelength dependent
attenuation measured in the
opposite direction to test no. 1.
3 Return loss ≥ 55 dB Launch fibre length: ≥ 2,0 m
IEC 61300-3-7 Return loss shall be met over
Condition:
operating wavelength range.
Refer Table C.1,
No.3.
Measurement ≤ 1 dB
uncertainty:
The port not under test shall be
optically terminated to avoid
unwanted reflections contributing to
the measurement.
4 Polarization ≤ 0,10 dB (single stage) Launch fibre length: ≥ 2,0 m
dependent
≤ 0,15 dB (double stage) Condition: PDL shall be met over operating
loss
wavelength range.
PDL
Measurement ≤ 0,02 dB
IEC 61300-3-2
uncertainty:
5 Polarization ≤ 0,20 ps (single stage) Launch fibre length: ≥ 2,0 m
mode dispersion
≤ 0,10 ps (double stage)
Measurement ≤ 0,05 ps
PMD uncertainty:
IEC 61300-3-32
No Tests Requirements Details
6 High optical Before and after the test, the Test set-up and Annex B
power limits of insertion loss procedure:
(attenuation), isolation, return
IEC 61300-2-14 Optical power: 300 mW
loss and PDL of test no. 1, 2, 3
and 4 shall be met.
IEC 61300-3-3
SOP of the light Average SOP (depolarized)
source:
During the forward input test,
Refer Annex B.
the insertion loss (attenuation)
Wavelength: 1 550 nm for C-band
change is monitored. During
and after the test, the insertion
1 580 nm for L-band
loss change shall be within
NOTE A different wavelength is
±0,3 dB of the initial value.
acceptable when there is a
During the backward input test,
negotiation between customer and
the isolation change is
supplier.
monitored. The sum of the
Duration of the
30 min
initial value and the change of
optical power
the isolation shall be within the
exposure:
value defined at test no. 2.
Temperature: 60 °C ± 2 °C
During the forward input test,
the return loss change is
Relative humidity: +2
93 % RH
monitored. The sum of the
−3
initial value and the change of
the return loss shall be within
NOTE This test condition focuses
the value defined at test no. 3.
to standard optical isolators.
The insertion loss
(attenuation), isolation and
return loss shall be measured
after launching an optical
power of 300 mW
simultaneously in both forward
and backward directions. After
the test, the insertion loss
change shall be within ±0,3 dB
of the initial value. After the
test, the sum of the initial value
and the change of the isolation
shall be within the value
defined at test no. 2. After the
test, the sum of the initial value
and the change of the return
loss shall be within the value
defined at test no. 3.
7 Cold Before and after the test, the Temperature: −10 °C ± 2 °C
limits of insertion loss
IEC 61300-2-17
Duration of 96 h
(attenuation), isolation, return
exposure:
loss and PDL of test no. 1, 2, 3
and 4 shall be met.
The insertion loss change after
the test shall be within ±0,3 dB
of the initial value.
8 Dry heat – High Before and after the test, the Temperature: +60 °C ± 2 °C
temperature limits of insertion loss
Duration of 96 h
endurance (attenuation), isolation, return
exposure:
loss and PDL of test no. 1, 2, 3
IEC 61300-2-18
and 4 shall be met.
The insertion loss (attenuation)
change after the test shall be
within ±0,3 dB of the initial
value.
9 Damp heat Before and after the test, the Temperature: +40°C ± 2 °C
(steady state) limits of insertion loss
Relative humidity: +2
93 % RH
(attenuation), isolation, return
−3
IEC 61300-2-19
loss and PDL of test no. 1, 2, 3
and 4 shall be met.
Duration of
IEC 61300-3-3 96 h
exposure:
During and after the test, the
Refer Annex C
insertion loss (attenuation)
change shall be within ±0,3 dB
of the initial value.
– 10 – IEC 61753-061-2:2020 © IEC 2020
No Tests Requirements Details
10 Change of Before and after the test, the High temperature: +60°C ± 2 °C
temperature limits of insertion loss
Low temperature: −10°C ± 2 °C
(attenuation), isolation, return
IEC 61300-2-22
loss and PDL of test no. 1, 2, 3
Number of cycles: Cycles 5
and 4 shall be met.
IEC 61300-3-3
Duration at extreme 60 min
During and after the test, the
Refer Annex C
temperature:
insertion loss (attenuation)
change shall be within ±0,3 dB
Rate of change: 1 °C /min
of the initial value.
The sum of the initial value and
the change of the isolation shall
be within the value defined at
test no. 2.
Before and after the test, the
11 Vibration Frequency range: 10 Hz to 55 Hz
limits of insertion loss
IEC 61300-2-1 Number of axes: 3 orthogonal axes
(attenuation), isolation, return
loss and PDL of test no. 1, 2, 3
IEC 61300-3-28
Number of sweeps: 15 /axis
and 4 shall be met.
Refer Annex C
Sweep rate: 1 octave/min
During and after the test, the
insertion loss (attenuation)
Amplitude: 0,75 mm
change shall be within ±0,3 dB
of the initial value.
12 Shock Before and after the test, the Acceleration: 5 000 m/s
limits of insertion loss
IEC 61300-2-9 Duration: 1 ms, half sine pulse
(attenuation) , isolation, return
loss and PDL of test no. 1, 2, 3
Number of axis: 3 axes in 2 directions
and 4 shall be met.
Number of shocks: 2 shocks per axis, 12 shocks
The insertion loss change after
in total
the test shall be within ±0,3 dB
of the initial value.
Flexing of the Before and after the test, the Tensile force: 2 N for reinforced cable
strain relief of limits of insertion loss
Number of cycles: 50 cycles
fibre optic (attenuation), isolation, return
devices loss and PDL of test no. 1, 2, 3 Angle: ±90°
IEC 61300-2-44 and 4 shall be met.
The insertion loss (attenuation)
change after the test shall be
within ±0,3 dB of the initial
value
Fibre/cable Before and after the test, the Magnitude and rate 10 N ± 1 N at 5 N/s for reinforced
retention limits of insertion loss of application: cables
(attenuation), isolation and
IEC 61300-2-4 5,0 N ± 0,5 N at 0,5 N/s for
return loss of test no. 1, 2, 3
secondary coated fibres
and 4 shall be met.
2,0 N ± 0,2 N at 0,5 N/s for primary
During and after the test,
coated fibres
insertion loss (attenuation)
change shall be within ±0,3 dB
Duration of the test: 60 s
of the initial value.
Before and after the test, the Magnitude and
15 Static side load 1 N for 1 h for reinforced cable
limits of insertion loss duration of the
IEC 61300-2-42 0,2 N for 5 min for secondary
(attenuation), isolation, return tensile load:
coated fibres
loss and PDL of test no. 1, 2, 3
and 4 shall be met. Direction of Two mutually perpendicular
application: directions
The insertion loss change after
the test shall be within ±0,3 dB
of the initial value.
Before and after the test, the Magnitude of the
16 Torsion Load: 5 N for cables
limits of insertion loss torsion/twist:
IEC 61300-2-5 2,0 N for primary coated and
(attenuation), isolation, return
buffered fibres
loss and PDL of test no. 1, 2, 3
and 4 shall be met. Angle and cycles: Angle: ±180°
The insertion loss (attenuation) Number of cycles: 10
change after the test shall be
Fibre/cable clamping distance:
Test condition:
within ±0,3 dB of the initial
25 cm ± 5 cm
value.
HD
Table 3 – Test details and requirements for category C
No Tests Requirements Details
1 Insertion loss ≤ 0,7 dB (single stage) Launch fibre length: ≥ 2,0 m
(attenuation) ≤ 0,8 dB (double stage) Condition: Attenuation (insertion loss) shall be
met over operating wavelength
IEC 61300-3-7
range and all state of polarization
(SOP).
IEC 61300-3-2
Measurement ≤ 0,1 dB
Refer Table C.1,
uncertainty:
No.1.
2 Isolation ≥ 20 dB (single stage) Launch fibre length: ≥ 2,0 m
IEC 61300-3-7 ≥ 40 dB (double stage) Condition: Isolation shall be met over
operating wavelength range and all
IEC 61300-3-2
SOP.
Refer Table C.1,
Measurement ≤ 0,3 dB (single stage)
No.2.
uncertainty:
≤ 0,5 dB (double stage)
NOTE IEC 61300-3-7 defines the
method to measure insertion loss.
However, it can apply to the
measurement of isolation, because
in the case of an isolator, isolation
is the insertion loss measured in the
opposite direction to test no. 1.
3 Return loss ≥ 55 dB Launch fibre length: ≥ 2,0 m
IEC 61300-3-7
Condition: Return loss shall be met over
operating wavelength range.
Refer Table C.1,
No.3.
Measurement ≤ 1 dB
uncertainty:
The port not under test shall be
optically terminated to avoid
unwanted reflections contributing to
the measurement
4 Polarization ≤ 0,10 dB (single stage) Launch fibre length: ≥ 2,0 m
dependent loss
≤ 0,15 dB (double stage)
Condition: PDL shall be met over operating
IEC 61300-3-2
wavelength range.
Measurement ≤ 0,02 dB
uncertainty:
5 Polarization ≤ 0,20 ps (single stage) Launch fibre length: ≥ 2,0 m
mode dispersion
≤ 0,10 ps (double stage)
Measurement ≤ 0,05 ps
IEC 61300-3-32
uncertainty:
– 12 – IEC 61753-061-2:2020 © IEC 2020
No Tests Requirements Details
6 High optical Before and after the test, the Test set-up and Annex B
power limits of insertion loss procedure:
(attenuation), isolation, return
IEC 61300-2-14
Optical power: 300 mW
loss and PDL of test no. 1, 2, 3
and 4 shall be met.
IEC 61300-3-3
SOP of the light Average SOP (depolarized)
source:
During the forward input test,
Refer Annex B.
the insertion loss (attenuaton)
Wavelength: 1 550 nm for C-band
change is monitored. During
and after the test, the insertion
1 580 nm for L-band
loss (attenuation) change shall
NOTE A different wavelength is
be within ±0,3 dB of the initial
acceptable when there is a
value.
negotiation between customer and
During the backward input test,
supplier
the isolation change is
Duration of the 30 min
monitored. The sum of the
optical power
initial value and the change of
the isolation shall be within the exposure:
value defined at test no. 2.
Temperature: 60 °C ± 2 °C
During the forward input test,
Relative humidity: +2
93 % RH
the return loss change is
−3
monitored. The sum of the
initial value and the change of

NOTE Thiis test condition focuses
the return loss shall be within
to standard optical isolators.
the value defined at test no. 3.
The insertion loss
(attenuation), isolation and
return loss shall be measured
after launching an optical
power of 300 mW
simultaneously in both forward
and backward directions. After
the test, the insertion loss
(attenuation) change shall be
within ±0,3 dB of the initial
value. After the test, the sum of
the initial value and the change
of the isolation shall be within
the value defined at test no. 2.
After the test, the sum of the
initial value and the change of
the return loss shall be within
the value defined at test no. 3.
7 Cold Before and after the test, the Temperature: −10 °C ± 2 °C
limits of insertion loss
IEC 61300-2-17
Duration of 96 h
(attenuation), isolation, return
exposure:
loss and PDL of test no. 1, 2, 3
and 4 shall be met.
The insertion loss (attenuation)
change after the test shall be
within ±0,3 dB of the initial
value.
8 High temperature Before and after the test, the Temperature: +70 °C ± 2 °C
endurance limits of insertion loss
Duration of 96 h
(attenuation), isolation, return
IEC 61300-2-18
exposure:
loss and PDL of test no. 1, 2, 3
and 4 shall be met.
The insertion loss (attenuation)
change after the test shall be
within ±0,3 dB of the initial
value.
No Tests Requirements Details
9 Damp heat Before and after the test, the Temperature: +40°C ± 2 °C
(steady state) limits of insertion loss
+2
Relative humidity:
93 % RH
(attenuation), isolation, return
−3
IEC 61300-2-19
loss and PDL of test no. 1, 2, 3
and 4 shall be met.
Duration of 96 h
IEC 61300-3-3
exposure:
During and after the test, the
Reger Annex C
insertion loss (attenuation)
change shall be within ±0,3 dB
of the initial value.
10 Change of Before and after the test, the High temperature: +70°C ± 2 °C
temperature limits of insertion loss
Low temperature: −10°C ± 2 °C
(attenuaton), isolation, return
IEC 61300-2-22
loss and PDL of test no. 1, 2, 3
Number of cycles: Cycles 5
and 4 shall be met.
IEC 61300-3-3
Duration at extreme 60 min
During and after the test, the
Refer Annex C
temperature:
insertion loss (attenuation)
change shall be within ±0,3 dB
Rate of change: 1 °C/min
of the initial value.
The sum of the initial value and
the change of the isolation shall
be within the value defined at
test no. 2.
11 Vibration Before and after the test, the Frequency range: 10 Hz to 55 Hz
limits of insertion loss
IEC 61300-2-1
Number of axes: 3 orthogonal axes
(attenuation), isolation, return
loss and PDL of test no. 1, 2, 3
IEC 61300-3-28
Number of sweeps: 15 /axis
and 4 shall be met.
Refer Annex C.
Sweep rate: 1 octave/min
During and after the test, the
insertion loss (attenuation)
Amplitude: 0,75 mm
change shall be within ±0,3 dB
of the initial value.
12 Shock Before and after the test, the Acceleration: 5 000 m/s
limits of insertion loss
IEC 61300-2-9 Duration: 1 ms, half sine pulse
(attenuation), isolation, return
loss and PDL of test no. 1, 2, 3
Number of axis: 3 axes in 2 directions
and 4 shall be met.
Number of shocks: 2 shocks per axis, 12 shocks
The insertion loss (attenuation)
in total
change after the test shall be
within ±0,3 dB of the initial
value.
13 Flexing of the Before and after the test, the Tensile force: 2 N for reinforced cable
strain relief of limits of insertion loss
Number of cycles: 50 cycles
fibre optic (attenuation), isolation, return
devices loss and PDL of test no. 1, 2, 3
Angle: ±90°
IEC 61300-2-44 and 4 shall be met.
The insertion loss change after
the test shall be within ±0,3 dB
of the initial value
14 Fibre/cable Before and after the test, the Magnitude and rate 10 N ± 1 N at 5 N/s for reinforced
retention limits of insertion loss of application: cables
(attenuation), isolation and
IEC 61300-2-4 5,0 N ± 0,5 N at 0,5 N/s for
return loss of test no. 1, 2, 3
secondary coated fibres
and 4 shall be met.
2,0 N ± ,2 N at 0,5 N/s for primary
During and after the test,
coated fibres
insertion loss (attenuation)
change shall be within ±0,3 dB
Duration of the test: 60 s
of the initial value.
– 14 – IEC 61753-061-2:2020 © IEC 2020
No Tests Requirements Details
15 Static side load Before and after the test, the Magnitude and 1 N for 1 h for reinforced cable
limits of insertion loss duration of the
IEC 61300-2-42 0,2 N for 5 min for secondary
(attenuation), isolation, return tensile load:
coated fibres
loss and PDL of test no. 1, 2, 3
and 4 shall be met.
Direction of Two mutually perpendicular
application: directions
The insertion loss (attenuation)
change after the test shall be
within ±0,3 dB of the initial
value.
16 Torsion Before and after the test, the Magnitude of the Load: 5 N for cables
limits of insertion loss torsion/twist:
IEC 61300-2-5 2,0 N for primary coated and
(attenuation), isolation, return
buffered fibres
loss and PDL of test no. 1, 2, 3
and 4 shall be met.
Angle and cycles: Angle: ±180°
The insertion loss (attenuation)
Number of cycles: 10
change after the test shall be
within ±0,3 dB of the initial
Test condition: Fibre/cable clamping distance:
value.
25 cm ± 5 cm
Annex A
(normative)
Sample size
The number of samples to be evaluated for each test is defined in the sample size column in
Table A.1.
Table A.1 – Sample size
Test number Test Sample size
1 Insertion loss 12
2 Isolation 12
3 Return loss 12
4 Polarization dependent loss 12
5 Polarization mode dispersion 12
6 High optical power 6
7 Cold 6
8 High temperature endurance 6
9 Damp heat (steady state) 6
10 Change of temperature 6
11 Vibration 6
12 Shock 6
13 Optical fibre cable flexing 6
14 Fibre/cable retention 6
15 Static side load 6
16 Torsion 6
– 16 – IEC 61753-061-2:2020 © IEC 2020
Annex B
(normative)
High power test procedure of fibre optic isolators
B.1 General
Annex B contains a high-power test procedure for fibre optic isolators. The test consists of three
steps: 1) forward input, 2) backward input and 3) both directions input.
B.2 Forward input test
B.2.1 Forward input test set-up
Figure B.1 shows the test set-up of the forward input test.

Key
S light source
BD branching device
DUT device under test
D detector
Figure B.1 – Test set-up of forward input test
B.2.2 Forward input test procedure
a) Connect light source, S, branching device, BD, device under test, the DUT and detectors, D,
shown in Figure B.1. Take care the direction of the DUT when connecting.
b) Turn on all apparatus.
c) Monitor the input power change at D1, insertion loss change at D2 and the return loss
change at D3.
d) Turn off all apparatus.
B.3 Backward input test
B.3.1 Backward input test set-up
Figure B.2 shows the test set-up of backward input test.

Key
S light source
BD branching device
DUT device under test
D detector
T termination
Figure B.2 – Test set-up of the backward input test
B.3.2 Backward input test procedure
a) Connect light source, S, branching device, BD, device under test, the DUT detectors, D, and
termination, T shown in Figure B.2. Take care of the direction of the DUT when connecting.
b) Turn on all apparatus.
c) Monitor the input power change at D1 and isolation change at D2.
d) Turn off all apparatus.
B.4 Both direction input test
B.4.1 Both direction input test set-up
Figure B.3 shows the test set-up of the both-direction input test.

– 18 – IEC 61753-061-2:2020 © IEC 2020
Key
S light source
ISO optical Isolator
BD branching device
DUT device under test
D detector
T termination
Figure B.3 – Test set-up of both direction input test
B.4.2 Both direction input test procedure
a) Measure insertion loss, return loss and isolation of the DUT.
b) Connect light source, S, branching device, BD, device under test, the DUT detectors, D, and
termination, T shown in Figure B.3. Take care of the direction of the DUT when connecting.
c) Turn on all apparatus.
d) Monitor the input powers of S1 and S2 at D1 and D2, respectively.
e) Turn off all apparatus.
f) Remove DUT from the test set-up. Then measure insertion loss, return loss, isolation and
PDL.
Annex C
(informative)
Example of detailed measurement conditions
including test details and requirements
Fibre optic isolators have relatively larger polarization dependent loss (PDL), wavelength
dependent loss (WDL), wavelength dependent isolation, and temperature dependent isolation
than other passive optical components, such as non-wavelength selective branching devices,
spatial switches. Therefore, users generally require optical performances, such as insertion loss,
isolation, including over all state of polarization (SOP), over operating wavelength range and
operating temperature range.
Table C.1 shows an example of the detailed measurement conditions to clarify the optical
performances over all SOP, operating wavelength range and operating temperature range.
Table C.1 – Example of detailed measurement conditions
No Tests Detailed measurement conditions
1 Insertion loss Launch fibre ≥ 2,0 m
(attenuation) length:
Polarization state Average state of polarization (SOP) (depolarized) with
and wavelength IEC 61300-3-7 over the operating wavelength range.
All SOP with IEC 61300-3-2 at the shortest, the centre and the
longest wavelengths.
Calculation Insertion loss is calculated by the sum of attenuation with average
SOP (depolarized) and the half of PDL by IEC 61300-3-2.
2 Isolation Launch fibre ≥ 2,0 m
length:
Polarization state Average SOP (depolarized) with IEC 61300-3-7 over the operating
and wavelength wavelength range.
All SOP with IEC 61300-3-2 at the shortest, the centre and the
longest wavelengths.
Calculation Isolation is calculated by the sum of isolation with average SOP
(depolarized) and the half of polarization dependence of isolation
by IEC 61300-3-2.
3 Return loss Lau
...