IEC 61753-056-2:2012

Fibre optic interconnecting devices and passive components - Performance standard - Part 056-2: Single mode fibre pigtailed style optical fuse for category C - Controlled environment

IEC 61753-056-2:2012 contains the minimum initial test and measurement requirements and severities which a fibre optical fuse satisfies in order for it to be categorised as meeting the requirements of single mode fibre pigtailed style optical fuse used in controlled environments. Optical performance specified in this document relates to in-line type configurations fuses only. Keywords: initial test and measurement requirements, single mode fibre pigtailed style optical fuse

Dispositifs d'interconnexion et composants passifs fibroniques - Norme de qualité de fonctionnement - Partie 056-2: Fusible optique du type fibre amorce à fibre unimodale pour catégorie C - Environnement contrôlé

IEC 61753-056-2: 2012 contient les exigences et les sévérités initiales minimales d’essai et de mesure auxquelles un fusible optique est tenu de satisfaire pour entrer dans une catégorie satisfaisant aux exigences du fusible optique du type fibre amorce à fibre unimodale, utilisé dans des environnements contrôlés. La performance optique spécifiée dans le présent document concerne des fusibles ayant des configurations de type en ligne uniquement.
Mots clés: exigences mesure et initiale d’essai, fusible optique du type fibre amorce à fibre unimodale

General Information

• Status: Published
• Publication Date: 03-Dec-2012
• ICS: 33.180.20 - Fibre optic interconnecting devices
• 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: 04-Dec-2012
• Completion Date: 31-Dec-2012

Overview

IEC 61753-056-2:2012 is the IEC performance standard for single mode fibre pigtailed style optical fuses intended for category C – controlled environments. It defines the minimum initial test and measurement requirements and severities that an in-line type optical fuse must satisfy to be classified against this category. The standard focuses on optical performance, qualification testing, reporting and product characterization for single‑mode, pigtailed, in‑line optical fuses.

Key topics and technical requirements

• Scope and configuration: Applies to single‑mode, fibre‑pigtailed, in‑line optical fuses used in controlled environments. Optical fuse behavior (permanent blocking at a predetermined power threshold) and wavelength independence across the specified spectral range are noted.
• Test plan and reports: Tests are defined in accordance with the IEC 61300 series; fully documented test reports and supporting evidence are required.
• Performance metrics (examples from Table 1):
  • Insertion loss: Measured over 1520 nm to 1625 nm; typical requirement ≤ 1.5 dB under specified launch and power conditions.
  • Return loss: Grade-based requirements (e.g., ≥ 35 dB for Grade T, up to ≥ 60 dB for Grade V) measured per IEC 61300-3-7.
  • Polarization dependent loss (PDL): Tight limits (e.g., ≤ 0.2 dB) measured per IEC 61300-3-2.
• Environmental & mechanical testing: Includes vibration, shock, cold, dry heat, damp heat, change of temperature, static side load, cable retention and strain relief flexing - referencing relevant IEC 61300 parts.
• Sampling, dimensions and thresholds: Sample size and product sourcing rules are in Annex A; power thresholds and maximum allowed power details in Annex B; example dimensions in Annex C; test set‑ups and procedures in Annex D.
• Safety / patent note: The introduction draws attention to possible patent claims related to optical fuse technology; users should consult referenced patent information if required.

Applications and who uses this standard

• Component manufacturers - for design verification, production qualification and datasheet claims for single‑mode pigtailed optical fuses.
• Test laboratories and QA teams - to perform mandated initial tests, generate compliant test reports, and classify devices by grade.
• System integrators and network operators - to specify and procure optical fuses with verified insertion loss, return loss and threshold characteristics for controlled environment installations (e.g., central offices, equipment racks).
• Procurement and compliance - for contract specifications, acceptance testing and interoperability assurance.

Related standards

• IEC 61300 series (basic test and measurement procedures)
• IEC 60869-1 (generic info on optical fuses)
• IEC 60793-2-50 (single‑mode fibre product specs)

Keywords: IEC 61753-056-2, initial test and measurement requirements, single mode fibre pigtailed style optical fuse, optical fuse performance, controlled environment.

Standards Content (Sample)

IEC 61753-056-2 ®
Edition 1.0 2012-12
INTERNATIONAL
STANDARD
Fibre optic interconnecting devices and passive components – Performance
standard –
Part 056-2: Single mode fibre pigtailed style optical fuse for category C –
Controlled environment
All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized in any form
or by any means, electronic or mechanical, including photocopying and microfilm, without permission in writing from
either IEC or IEC's member National Committee in the country of the requester.
If you have any questions about IEC copyright or have an enquiry about obtaining additional rights to this publication,
please contact the address below or your local IEC member National Committee for further information.

IEC Central Office Tel.: [phone]
3, rue de Varembé Fax: [phone]
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Switzerland www.iec.ch
About the IEC
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International Standards for all electrical, electronic and related technologies.

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IEC 61753-056-2 ®
Edition 1.0 2012-12
INTERNATIONAL
STANDARD
Fibre optic interconnecting devices and passive components – Performance

standard –
Part 056-2: Single mode fibre pigtailed style optical fuse for category C –

Controlled environment
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
PRICE CODE
R
ICS 33.180.20 ISBN 978-2-83220-515-0

– 2 – 61753-056-2 © IEC:2012(E)
CONTENTS
FOREWORD . 3
INTRODUCTION . 5
1 Scope . 6
2 Normative references . 6
3 Tests . 7
4 Test reports . 7
5 Performance requirements . 7
5.1 Sample size, sequencing and grouping. 7
5.2 Dimensions . 7
5.3 Test details and requirements . 8
Annex A (normative) Sample size and product sourcing requirements . 14
Annex B (normative) Power thresholds for optical fuses . 15
Annex C (informative) Example of dimensions for optical fuses . 16
Annex D (normative) Testing of optical fuses . 17

Figure C.1 – Optical fuse, in-line configuration, regularly without connectors . 16
Figure D.1 – Test set-up schematics . 17
Figure D.2 – Example of power threshold and blocking attenuation at threshold

measurements for sample 1280A of an optical fuse . 18
Figure D.3 – Response time curve of an optical fuse. 19
Figure D.4 – Response time testing set-up. 19

Table 1 – Performance requirements for optical fuses . 8
Table A.1 – Sample size and product sourcing requirements . 14
Table B.1 – Powers for optical fuses, single-mode . 15

61753-056-2 © IEC:2012(E) – 3 –
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
FIBRE OPTIC INTERCONNECTING DEVICES
AND PASSIVE COMPONENTS –
PERFORMANCE STANDARD –
Part 056-2: Single mode fibre pigtailed
style optical fuse for category C –
Controlled environment
FOREWORD
1) The International Electrotechnical Commission (IEC) is a worldwide organization for standardization comprising
all national electrotechnical committees (IEC National Committees). The object of IEC is to promote
international co-operation on all questions concerning standardization in the electrical and electronic fields. To
this end and in addition to other activities, IEC publishes International Standards, Technical Specifications,
Technical Reports, Publicly Available Specifications (PAS) and Guides (hereafter referred to as “IEC
Publication(s)”). Their preparation is entrusted to technical committees; any IEC National Committee interested
in the subject dealt with may participate in this preparatory work. International, governmental and non-
governmental organizations liaising with the IEC also participate in this preparation. IEC collaborates closely
with the International Organization for Standardization (ISO) in accordance with conditions determined by
agreement between the two organizations.
2) The formal decisions or agreements of IEC on technical matters express, as nearly as possible, an international
consensus of opinion on the relevant subjects since each technical committee has representation from all
interested IEC National Committees.
3) IEC Publications have the form of recommendations for international use and are accepted by IEC National
Committees in that sense. While all reasonable efforts are made to ensure that the technical content of IEC
Publications is accurate, IEC cannot be held responsible for the way in which they are used or for any
misinterpretation by any end user.
4) In order to promote international uniformity, IEC National Committees undertake to apply IEC Publications
transparently to the maximum extent possible in their national and regional publications. Any divergence
between any IEC Publication and the corresponding national or regional publication shall be clearly indicated in
the latter.
5) IEC itself does not provide any attestation of conformity. Independent certification bodies provide conformity
assessment services and, in some areas, access to IEC marks of conformity. IEC is not responsible for any
services carried out by independent certification bodies.
6) All users should ensure that they have the latest edition of this publication.
7) No liability shall attach to IEC or its directors, employees, servants or agents including individual experts and
members of its technical committees and IEC National Committees for any personal injury, property damage or
other damage of any nature whatsoever, whether direct or indirect, or for costs (including legal fees) and
expenses arising out of the publication, use of, or reliance upon, this IEC Publication or any other IEC
Publications.
8) Attention is drawn to the Normative references cited in this publication. Use of the referenced publications is
indispensable for the correct application of this publication.
International Standard IEC 61753-056-2 has been prepared by subcommittee SC86B: Fibre
optic interconnecting devices and passive components, of IEC technical committee TC86:
Fibre optics.
The text of this standard is based on the following documents:
FDIS Report on voting
86B/3500/FDIS 86B/3544/RVD
Full information on the voting for the approval of this standard can be found in the report on
voting indicated in the above table.
This publication has been drafted in accordance with the ISO/IEC Directives, Part 2.

– 4 – 61753-056-2 © IEC:2012(E)
A list of all parts in 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.
The committee has decided that the contents of this publication will remain unchanged until
the stability date indicated on the IEC web site under "http://webstore.iec.ch" in the data
related to the specific publication. At this date, the publication will be
• reconfirmed,
• withdrawn,
• replaced by a revised edition, or
• amended.
A bilingual version of this publication may be issued at a later date.

61753-056-2 © IEC:2012(E) – 5 –
INTRODUCTION
1) The International Electrotechnical Commission (IEC) draws attention to the fact that it is
claimed that compliance with this document may involve the use of a patent concerning
optical fuse.
IEC takes no position concerning the evidence, validity and scope of this patent right.
The holder of this patent right has assured the IEC that he/she is willing to negotiate
licences either free of charge or under reasonable and non-discriminatory terms and
conditions with applicants throughout the world. In this respect, the statement of the
holder of this patent right is registered with IEC. Information may be obtained from:
KiloLambda technologies, Ltd.
22a Wallenberg street,
Tel-Aviv 69719,
Israel
Attention is drawn to the possibility that some of the elements of this document may be the
subject of patent rights other than those identified above. IEC shall not be held
responsible for identifying any or all such patent rights.
ISO (www.iso.org/patents) and IEC (http://patents.iec.ch) maintain on-line data bases of
patents relevant to their standards. Users are encouraged to consult these data bases for
the most up-to-date information concerning patents.
US patent US-7162,114 B2, Optical Energy switching device and method", granted
January 9, 2007.
Japan patent 4376632, Optical Energy switching device and method", granted September
18, 2009.
2) The optical fuse is a passive device, designed to protect equipment and fibre cables from
damage due to optical overpower, spikes and surges. The optical fuse produces a
controlled, permanent, signal blocking at a predetermined power threshold in an optical
fibre transmission line. The optical fuse is wavelength independent over its entire specified
spectral range. IEC 60869-1 contains generic information on optical fuses. The optical
fuse has a maximum allowed power input P . Beyond this power it is dysfunctional
in max
and can let light through. Numerical values for P are given in Annex B.
in max
– 6 – 61753-056-2 © IEC:2012(E)
FIBRE OPTIC INTERCONNECTING DEVICES
AND PASSIVE COMPONENTS –
PERFORMANCE STANDARD –
Part 056-2: Single mode fibre pigtailed
style optical fuse for category C –
Controlled environment
1 Scope
This part of IEC 61753 contains the minimum initial test and measurement requirements and
severities which a fibre optical fuse satisfies in order for it to be categorised as meeting the
requirements of single mode fibre pigtailed style optical fuse used in controlled environments.
Optical performance specified in this document relates to in-line type configurations fuses
only.
2 Normative references
The following documents, in whole or in part, are normatively referenced in this document and
are indispensable for its application. 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 60869-1, Fibre optic interconnecting devices and passive components – Fibre optic
passive power control devices – Part 1: Generic specification
IEC 61300-1, Fibre optic interconnecting devices and passive components – Basic test and
measurement procedures – Part 1: General and guidance
IEC 61300-2-1, Fibre optic interconnecting devices and passive components – Basic test and
measurement procedures – Part 2-1: Tests – Vibration (sinusoidal)
IEC 613000-2-4, Fibre optic interconnecting devices and passive components – Basic test
and measurement procedures – Part 2-4: Fibre/cable retention
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
___________
To be published.
61753-056-2 © IEC:2012(E) – 7 –
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
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
dependent 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 61300-3-32, 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
3 Tests
All test methods are in accordance with the IEC 61300 series.
All tests are to be carried out to validate performance over the required operating wavelength
and power range. As a result, single or multiple spectral bands may be chosen for the
qualification in addition to threshold power.
4 Test reports
Fully documented test reports and supporting evidence shall be prepared and shall be
available for inspection as evidence that the tests have been carried out and complied with.
5 Performance requirements
5.1 Sample size, sequencing and grouping
Sample sizes for the tests are defined in Annex A.
5.2 Dimensions
Dimensions shall comply with either an appropriate IEC interface standard or with those given
in appropriate manufacturers’ drawings, where the IEC interface standard does not exist or
cannot be used.
– 8 – 61753-056-2 © IEC:2012(E)
5.3 Test details and requirements
Table 1 specifies the optical environmental and mechanical performance requirements and
test methods for optical fuses pertaining to this standard.
Compliance to this standard requires demonstration of the ability to meet the performance
requirement in Table 1.
Table 1 – Performance requirements for optical fuses (1 of 6)
No. Tests Requirements Details
1 Insertion loss Operating wavelength range: Method: IEC 61300-3-7, test sample configuration
1 520 nm to1 625 nm according to Method B2.1

Insertion loss ≤ 1,5 dB Launch patchcord ≥ 2 m. Only the fundamental mode shall
length: propagate at the fuse interface and at the
Insertion loss is measured
detector.
with input power ≤ –5 dBm
Launch conditions: The wavelength of the source shall be longer
than cut-off wavelength of the fibre.
Source power Less than or equal or equal ± 0,05 dB over
stability:
the measuring period or at least 1 h
Wavelength range: 1 520 nm to 1 625 nm
Total uncertainty
≤ ± 0,05 dB
2 Return loss Method: IEC 61300-3-7 measurement, Method 1
≥ 35 dB Grade T
below power OCWR for grades T,R, U
≥ 40 dB Grade R
threshold
IEC 61300-3-7, measurement method 1
≥ 50 dB Grade U
OFDR for grade V
≥ 60 dB Grade V
Source: LD 1 520 nm and 1 625 nm
Return loss is measured with
Test every sample with the two wavelengths.
input power ≤ –5 dBm
Total uncertainty ≤± 2 dB
3 Return loss Method: IEC 61300-3-7, measurement method 1
≥ 30 dB
above power OCWR
Return loss is measured with
threshold, after
inpu
...

IEC 61753-056-2 ®
Edition 1.0 2012-12
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
Fibre optic interconnecting devices and passive components – Performance
standard –
Part 056-2: Single mode fibre pigtailed style optical fuse for category C –
Controlled environment
Dispositifs d’interconnexion et composants passifs fibroniques – Norme de
performance
Partie 056-2: Fusible optique du type fibre amorce à fibre unimodale pour
catégorie C – Environnement contrôlé

All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized in any form
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International Standards for all electrical, electronic and related technologies.

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IEC 61753-056-2 ®
Edition 1.0 2012-12
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
Fibre optic interconnecting devices and passive components – Performance

standard –
Part 056-2: Single mode fibre pigtailed style optical fuse for category C –

Controlled environment
Dispositifs d’interconnexion et composants passifs fibroniques – Norme de

performance
Partie 056-2: Fusible optique du type fibre amorce à fibre unimodale pour

catégorie C – Environnement contrôlé

INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
INTERNATIONALE
ICS 33.180.20 ISBN 978-2-8322-7221-3

– 2 – IEC 61753-056-2:2012 © IEC 2012
CONTENTS
FOREWORD . 3
INTRODUCTION . 5
1 Scope . 6
2 Normative references . 6
3 Tests . 7
4 Test reports . 7
5 Performance requirements. 7
5.1 Sample size, sequencing and grouping . 7
5.2 Dimensions . 7
5.3 Test details and requirements . 8
Annex A (normative) Sample size and product sourcing requirements . 14
Annex B (normative) Power thresholds for optical fuses . 15
Annex C (informative) Example of dimensions for optical fuses . 16
Annex D (normative) Testing of optical fuses . 17

Figure C.1 – Optical fuse, in-line configuration, regularly without connectors . 16
Figure D.1 – Test set-up schematics . 17
Figure D.2 – Example of power threshold and blocking attenuation at threshold
measurements for sample 1280A of an optical fuse . 18
Figure D.3 – Response time curve of an optical fuse. 19
Figure D.4 – Response time testing set-up. 19

Table 1 – Performance requirements for optical fuses . 8
Table A.1 – Sample size and product sourcing requirements . 14
Table B.1 – Powers for optical fuses, single-mode . 15

INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
FIBRE OPTIC INTERCONNECTING DEVICES
AND PASSIVE COMPONENTS –
PERFORMANCE STANDARD –
Part 056-2: Single mode fibre pigtailed
style optical fuse for category C –
Controlled environment
FOREWORD
1) The International Electrotechnical Commission (IEC) is a worldwide organization for standardization comprising
all national electrotechnical committees (IEC National Committees). The object of IEC is to promote
international co-operation on all questions concerning standardization in the electrical and electronic fields. To
this end and in addition to other activities, IEC publishes International Standards, Technical Specifications,
Technical Reports, Publicly Available Specifications (PAS) and Guides (hereafter referred to as “IEC
Publication(s)”). Their preparation is entrusted to technical committees; any IEC National Committee interested
in the subject dealt with may participate in this preparatory work. International, governmental and non-
governmental organizations liaising with the IEC also participate in this preparation. IEC collaborates closely
with the International Organization for Standardization (ISO) in accordance with conditions determined by
agreement between the two organizations.
2) The formal decisions or agreements of IEC on technical matters express, as nearly as possible, an international
consensus of opinion on the relevant subjects since each technical committee has representation from all
interested IEC National Committees.
3) IEC Publications have the form of recommendations for international use and are accepted by IEC National
Committees in that sense. While all reasonable efforts are made to ensure that the technical content of IEC
Publications is accurate, IEC cannot be held responsible for the way in which they are used or for any
misinterpretation by any end user.
4) In order to promote international uniformity, IEC National Committees undertake to apply IEC Publications
transparently to the maximum extent possible in their national and regional publications. Any divergence
between any IEC Publication and the corresponding national or regional publication shall be clearly indicated in
the latter.
5) IEC itself does not provide any attestation of conformity. Independent certification bodies provide conformity
assessment services and, in some areas, access to IEC marks of conformity. IEC is not responsible for any
services carried out by independent certification bodies.
6) All users should ensure that they have the latest edition of this publication.
7) No liability shall attach to IEC or its directors, employees, servants or agents including individual experts and
members of its technical committees and IEC National Committees for any personal injury, property damage or
other damage of any nature whatsoever, whether direct or indirect, or for costs (including legal fees) and
expenses arising out of the publication, use of, or reliance upon, this IEC Publication or any other IEC
Publications.
8) Attention is drawn to the Normative references cited in this publication. Use of the referenced publications is
indispensable for the correct application of this publication.
International Standard IEC 61753-056-2 has been prepared by subcommittee SC86B: Fibre
optic interconnecting devices and passive components, of IEC technical committee TC86:
Fibre optics.
This bilingual version (2019-07) corresponds to the monolingual English version, published
in 2012-12.
The text of this standard is based on the following documents:
FDIS Report on voting
86B/3500/FDIS 86B/3544/RVD
Full information on the voting for the approval of this standard can be found in the report on
voting indicated in the above table.

– 4 – IEC 61753-056-2:2012 © IEC 2012
The French version of this standard has not been voted upon.
This publication has been drafted in accordance with the ISO/IEC Directives, Part 2.
A list of all parts in 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.
The committee has decided that the contents of this publication will remain unchanged until
the stability date indicated on the IEC web site under "http://webstore.iec.ch" in the data
related to the specific publication. At this date, the publication will be
• reconfirmed,
• withdrawn,
• replaced by a revised edition, or
• amended.
INTRODUCTION
1) The International Electrotechnical Commission (IEC) draws attention to the fact that it is
claimed that compliance with this document may involve the use of a patent concerning
optical fuse.
IEC takes no position concerning the evidence, validity and scope of this patent right.
The holder of this patent right has assured the IEC that he/she is willing to negotiate
licences either free of charge or under reasonable and non-discriminatory terms and
conditions with applicants throughout the world. In this respect, the statement of the
holder of this patent right is registered with IEC. Information may be obtained from:
KiloLambda technologies, Ltd.
22a Wallenberg street,
Tel-Aviv 69719,
Israel
Attention is drawn to the possibility that some of the elements of this document may be the
subject of patent rights other than those identified above. IEC shall not be held
responsible for identifying any or all such patent rights.
ISO (www.iso.org/patents) and IEC (http://patents.iec.ch) maintain on-line data bases of
patents relevant to their standards. Users are encouraged to consult these data bases for
the most up-to-date information concerning patents.
US patent US-7162,114 B2, Optical Energy switching device and method", granted
January 9, 2007.
Japan patent 4376632, Optical Energy switching device and method", granted September
18, 2009.
2) The optical fuse is a passive device, designed to protect equipment and fibre cables from
damage due to optical overpower, spikes and surges. The optical fuse produces a
controlled, permanent, signal blocking at a predetermined power threshold in an optical
fibre transmission line. The optical fuse is wavelength independent over its entire specified
spectral range. IEC 60869-1 contains generic information on optical fuses. The optical
fuse has a maximum allowed power input P . Beyond this power it is dysfunctional
in max
and can let light through. Numerical values for P are given in Annex B.
in max
– 6 – IEC 61753-056-2:2012 © IEC 2012
FIBRE OPTIC INTERCONNECTING DEVICES
AND PASSIVE COMPONENTS –
PERFORMANCE STANDARD –
Part 056-2: Single mode fibre pigtailed
style optical fuse for category C –
Controlled environment
1 Scope
This part of IEC 61753 contains the minimum initial test and measurement requirements and
severities which a fibre optical fuse satisfies in order for it to be categorised as meeting the
requirements of single mode fibre pigtailed style optical fuse used in controlled environments.
Optical performance specified in this document relates to in-line type configurations fuses
only.
2 Normative references
The following documents, in whole or in part, are normatively referenced in this document and
are indispensable for its application. 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 60869-1, Fibre optic interconnecting devices and passive components – Fibre optic
passive power control devices – Part 1: Generic specification
IEC 61300-1, Fibre optic interconnecting devices and passive components – Basic test and
measurement procedures – Part 1: General and guidance
IEC 61300-2-1, Fibre optic interconnecting devices and passive components – Basic test and
measurement procedures – Part 2-1: Tests – Vibration (sinusoidal)
IEC 613000-2-4, Fibre optic interconnecting devices and passive components – Basic test
and measurement procedures – Part 2-4: Fibre/cable retention
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
___________
To be published.
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
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
dependent 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 61300-3-32, 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
3 Tests
All test methods are in accordance with the IEC 61300 series.
All tests are to be carried out to validate performance over the required operating wavelength
and power range. As a result, single or multiple spectral bands may be chosen for the
qualification in addition to threshold power.
4 Test reports
Fully documented test reports and supporting evidence shall be prepared and shall be
available for inspection as evidence that the tests have been carried out and complied with.
5 Performance requirements
5.1 Sample size, sequencing and grouping
Sample sizes for the tests are defined in Annex A.
5.2 Dimensions
Dimensions shall comply with either an appropriate IEC interface standard or with those given
in appropriate manufacturers’ drawings, where the IEC interface standard does not exist or
cannot be used.
– 8 – IEC 61753-056-2:2012 © IEC 2012
5.3 Test details and requirements
Table 1 specifies the optical environmental and mechanical performance requirements and
test methods for optical fuses pertaining to this standard.
Compliance to this standard requires demonstration of the ability to meet the performance
requirement in Table 1.
Table 1 – Performance requirements for optical fuses (1 of 6)
No. Tests Requirements Details
1 Insertion loss Operating wavelength range: Method: IEC 61300-3-7, test sample configuration
1 520 nm to1 625 nm according to Method B2.1

Insertion loss ≤ 1,5 dB Launch patchcord ≥ 2 m. Only the fundamental mode shall
length:
propagate at the fuse interface and at the
Insertion loss is measured
detector.
with input power ≤ –5 dBm
Launch conditions: The wavelength of the source shall be longer
than cut-off wavelength of the fibre.
Source power Less than or equal or equal ± 0,05 dB over
stability:
the measuring period or at least 1 h
Wavelength range: 1 520 nm to 1 625 nm
Total uncertainty ≤ ± 0,05 dB
2 Return loss Method: IEC 61300-3-7 measurement, Method 1
≥ 35 dB Grade T
below power OCWR for grades T,R, U
≥ 40 dB Grade R
threshold
IEC 61300-3-7, measurement method 1
≥ 50 dB Grade U
OFDR for grade V
≥ 60 dB Grade0 V
Source: LD 1 520 nm and 1 625 nm
Return loss is measured with
Test every sample with the two wavelengths.
input power ≤ –5 dBm
Total uncertainty
≤± 2 dB
3 Return loss Method: IEC 61300-3-7, measurement method 1
≥ 30 dB
above power OCWR
Return loss is measured with
threshold, after
Source: LD 1 520 nm and 1 625 nm
input power ≤ –5 dBm
fuse response
Test every sample with the two wavelengths.

Total uncertainty ≤ ± 2 dB
4 Polarization ≤0,2 dB Method: IEC 61300-3-2, all polarization methods
dependent loss
Over the specified operating
Optical source 1 550 nm ± 10 nm

wavelength range Wavelength:
The samples shall be
Total uncertainty: ≤ ± 0,05 dB over the dynamic range to be
terminated onto single-mode
measured
fibres as per IEC 60793-2-
50, Type B 1.1, in either
coated fibres (primary and
secondary) or reinforced
cable format
5 Polarization Method: IEC 61300-3-32, MPS method
≤ 0,2 ps
mode dispersion
Over the specified operating Optical source 1 550 nm ± 10 nm
wavelength range Wavelength:
Total uncertainty:
≤ ± 0,05 dB over the dynamic range to be
measured
Table 1 (2 of 6)
No. Tests Requirements Details
6 High optical The fuse will not change its Method: IEC 61300-2-14
power insertion and return loss up
Optical source
1 550 nm ± 10 nm
to power threshold
Below power Wavelength:
threshold Before and after the test the
Test power: 3 dB below power threshold
Insertion loss shall meet the
requirements of test 1
Test temperature:
25 °C ± 2 °C
Before and after the test the
Test duration: Long-term test: 96 h at test power
return loss shall meet the
requirements of test 2
The insertion loss change
during the test shall be
within ± 0,5 dB of the initial
value
7 High optical The fuse will block the Method: IEC 61300-2-14
power power from power threshold
to ≥ 30 dBm input power or
Optical source 1 550 nm ± 10 nm
Above power
higher value specified in
Wavelength:
threshold
Annex B
(destructive Test power: 3 dB above power threshold
Before the test the Insertion
test)
loss shall meet the
requirements of test 1
Test temperature:
25 °C ± 2 °C
After and during the test the
Insertion loss shall meet the
requirements of test 9
Test duration: Long-term test: 96 h at test power
Before and after the test the
return loss shall meet the
requirements of test 2
8 Power threshold Method: See Annex D for detailed test description.
The tolerance is ± 1 dB from
the specified optical fuse
(destructive The test power input is 1 dB to 3 dB above
power threshold
test) power threshold and the blocking attenuation
is measured accordingly.
The fuse will meet the power
threshold requirements as
Samples from every batch will be
specified when operated at
destructively tested, all will comply.
the 3 specified temperatures
Optical source 1 550 nm
Wavelength:
Test temperature:
10 °C ± 2 °C
25 °C ± 2 °C
60 °C ± 2 °C
9 Blocking >30 dB Method: See Annex D for detailed test description.
attenuation at
The fuse will  meet the The test power input is 1 to 3 dB above
threshold
requirement as specified, power threshold and the blocking attenuation
(destructive when operated at the 3 is measured accordingly.
test) specified temperatures for
Samples from every batch will be
the specified duration
destructively tested, all will comply.
Optical source 1 550 nm
Wavelength:
Test duration: 96 h at test power
Test temperature:
10 °C ± 2 °C
25 °C ± 2 °C
60 °C ± 2 °C
– 10 – IEC 61753-056-2:2012 © IEC 2012
Table 1 (3 of 6)
No. Tests Requirements Details
10 Response time Method: See Annex D for detailed test description.
<100 µs
The test power input is 1 dB to 3 dB above
The fuse will meet the
requirement as specified, power threshold and the blocking attenuation
when operated at the 3 is measured accordingly.
specified temperatures
Samples from every batch will be
destructively tested, all will comply.
Optical source 1 550 nm
Wavelength:
Test temperature:
10 °C ± 2 °C
25 °C ± 2 °C
60 °C ± 2 °C
11 Damp heat By the end of the test the
Method: IEC 61300-2-19
Insertion loss shall meet the
(steady state)
During the test the change in Insertion loss
requirements of test 1
shall be measured by test method
By the end of the test the IEC 61300-3-3.

return loss shall meet the
Pre conditioning Standard atmospheric conditions as defined
requirements of test 2
procedure: in IEC 61300-1 for 2 h
The insertion loss change
Temperature:
+ 40 ± 2 °C
during the test shall be
within ± 0,5 dB of the initial
+2
Relative humidity:
93 % RH
value. Insertion loss is
−3
measured with input power
≤ –5 dBm
Duration of 96 h
exposure:
After the test the power
threshold shall meet the
Specimen optically Yes
requirements of test 8
functioning:
Optical source 1 550 nm
Wavelength:
Optical power: 3 dB lower than power threshold, as defined
in Annex B
Recovery Allow specimens to return to standard
procedure: atmospheric conditions defined in
IEC 61300-1 in 2 h.
Table 1 (4 of 6)
No. Tests Requirements Details
12 Change of By the end of the test the Method: IEC 61300-2-22
temperature insertion loss shall meet the
During the test the change in Insertion loss
requirements of test 1
shall be measured by test method
By the end of the test the IEC 61300-3-3.
return loss shall meet the
Pre conditioning Standard atmospheric conditions as defined
requirements of test 2
procedure: in IEC 61300-1 for 2 h
The insertion loss change
High temperature:
+ 60 ± 2 °C
during the test shall be
within ± 0,5 dB of the initial
Low temperature: –10 ± 2 °C
value. Insertion loss is
measured with input power
Duration at 1 h
≤ –5 dBm
extreme
temperature:
After the test the power
threshold shall meet the
Temperature rate 1 °C/min
requirements of test 8
of change:
Number of cycles: 5
Specimen optically Yes
functioning:
Maximum sampling 15 min
interval during the
test:
Optical source 1 550 nm
Wavelength:
Optical power: 3 dB lower than power threshold, as defined
in Annex B
Recovery Allow specimens to return to standard
procedure: atmospheric conditions defined in
IEC 61300-1 in 2 h.
13 Dry heat-high By the end of the test the Method: IEC 61300-2-18
temperature insertion loss shall meet the

During the test the change in insertion loss
endurance requirements of test 1
shall be measured by test method
By the end of the test the IEC 61300-3-3.
return loss shall meet the
Pre conditioning Standard atmospheric conditions as defined
requirements of test 2
procedure: in IEC 61300-1 for 2 h
The insertion loss change
High temperature: + 60 ± 2 °C
during the test shall be
within ± 0,5 dB of the initial
Duration at 96 h
value. Insertion loss is
extreme
measured with input power
temperature:
≤ –5 dBm
Specimen optically Yes
After the test the power
functioning:
threshold shall meet the
requirements of test 8
Optical source 1 550 nm
Wavelength:
Optical power: 3 dB lower than power threshold, as defined
in Annex B
Recovery Allow specimens to return to standard
procedure: atmospheric conditions defined in
IEC 61300-1 in 2 h.
– 12 – IEC 61753-056-2:2012 © IEC 2012
Table 1 (5 of 6)
No. Tests Requirements Details
14 Cold By the end of the test the Method: IEC 61300-2-17.
insertion loss shall meet the
During the test the change in insertion loss
requirements of test 1
shall be measured by test method

By the end of the test the IEC 61300-3-3.
return loss shall meet the
Pre conditioning Standard atmospheric conditions as defined
requirements of test 2
procedure: in IEC 61300-1 for 2 h
The insertion loss change
Low temperature: -10 ± 2 °C
during the test shall be
within ± 0,5 dB of the initial
Duration at 96 h
value. Insertion loss is
extreme
measured with input power ≤
temperature:
–5 dBm
Specimen optically Yes
After the test the power
functioning:
threshold shall meet the
requirements of test 8
Optical source 1 550 nm
Wavelength:
Optical power: 3 dB lower than power threshold, as defined
in Annex B
Maximum sampling 1 h
interval during the
test:
Recovery Allow specimens to return to standard
procedure: atmospheric conditions defined in
IEC 61300-1 in 2 h.
15 Vibration After the test the insertion Method: IEC 61300-2-1
loss shall meet the
(Sinusoidal) During the test the change in insertion loss
requirements of test 1
shall be measured by test method

After the test the return loss IEC 61300-3-3.
shall meet the requirements
Frequency range: 10 – 55 Hz
of test 2
Vibration 0,75 mm
The insertion loss change
amplitude:
during the test shall be
within ± 0,5 dB of the initial
Number of cycles: 15
value. Insertion loss is
measured with input power
Rate of change: 1 octave/min
≤ –5 dBm
Number of axes: 3 orthogonal axes
After the test the power
Specimen optically No
threshold shall meet the
functioning:
requirements of test 8
Optical power: 3 dB lower than power threshold, as defined

in Annex B
Optical source
1 550 nm
Wavelength
Shock After the test the insertion Method: IEC 61300-2-9
loss shall meet the
Acceleration force: 500 g
requirements of test 1
Number of axes: 3 axes, 2 directions
After the test the return loss
shall meet the requirements
Number of cycles: 2 shocks per direction, 12 shocks total
of test 2
Duration per axis: Nominal 1 ms duration, half sine pulse
After the test the power
threshold shall meet the
Measurements Before, after each axis, and after the test
requirements of test 8
required:
Specimen optically No
functioning:
Optical source 1 550 nm
Wavelength
Optical power: 3 dB lower than power threshold, as defined
in Annex B
Table 1 (6 of 6)
No. Tests Requirements Details
17 Static side After the test the insertion Method: IEC 61300-2-42
load loss shall meet the
Magnitude of the 1 N for 1 h for reinforced cable
requirements of test 1
load:
0,2 N for 5 min for secondary coated fibres
After the test the return loss
shall meet the requirements
Rate of load 0,5 N/s
of test 2
application:
Above measurements
carried out in power
≤ –5 dBm
Load application 0,3 m from the end of the device and two
point: mutually perpendicular directions as

permitted by the product design
Specimen optically No
functioning:
Optical source 1 550 nm
Wavelength:
18 Fibre/cable By the end of the test the Method: IEC 61300-2-4.
retention insertion loss shall meet the
Magnitude of the
requirements of test 1
load:
10 N ± 1 N at 5 N/s for reinforced cables
By the end of the test the
return loss shall meet the
5,0 N ± 0,5 N at 0,5 N/s for secondary coated
requirements of test 2
fibres
The insertion loss change
2,0 N ± 0,2 N at 0,5 N/s for primary coated
during the test shall be
fibres
within ± 0,5 dB of the initial
value. Insertion loss is
Load application 0,3 m from point where the fibre/cable exits
measured with input power ≤
point: from the specimen
–5 dBm
Duration of the 120 s duration at 10 N

load:
60 s duration at 2 N or 5 N
Method of The sample shall be rigidly mounted such that
mounting: the load is only applied to the fibre/cable
retention mechanism.
Specimen optically Yes
functioning:
Optical source 1 550 nm
Wavelength:
Optical power: 3 dB lower than power threshold, as defined
in Annex B
19 Optical fibre After the test the insertion Method: IEC 61300-2-44
cable flexing loss shall meet the

requirements of test 1
Magnitude of the 2 N for reinforced cable
After the test the return loss
load:
shall meet the requirements
of test 2
Angle of deflection
± 90°
per cycle:
Number of cycles: 30
Specimen optically No
functioning:
Method of The sample shall be rigidly mounted such that
mounting: the load is only applied to the fibre/cable.
Static side load shall be applied in two mutually perpendicular directions as permitted by the product design. For
example, a product with a base plate extending beyond the fibre exit may prohibit loading in that direction.

– 14 – IEC 61753-056-2:2012 © IEC 2012
Annex A
(normative)
Sample size and product sourcing requirements
Table A.1 gives sample size and product sourcing requirements.
Table A.1 – Sample size and product sourcing requirements
No. Test Sample size Source
N/A Dimensional 10 New
1 Insertion loss 80 New
2 Return loss below power threshold (against two fusion 80 Test 1

splices )
3 Return loss above power threshold (against two fusion 12 Test 8 or 9

splices )
4 Polarization dependent loss 4 Test 2
5 Polarization mode dispersion 4 Test 4
6 High optical power. Below power threshold 4 Test 5
7 High optical power. Above power threshold 4 Test 2
8 Power threshold, (destructive test) 12 Test 2
4 samples at each temperature
9 Blocking attenuation at threshold, (destructive test) 12 Test 2
10 Response time, (destructive test) 12 Test 2
11 Damp heat (steady state) 4 Test 2
12 Change of temperature 4 Test 2
13 High temperature endurance 4 Test 2
14 Cold 4 Test 2
Vibration (sinusoidal)
15 4 Test 2
16 Shock 4 Test 2
17 Static side load 4 Test 2
18 Fibre/cable retention 4 Test 2
19 Optical fibre cable flexing 4 Test 2
NOTE Tests 5 to 19 may be performed at any order. Samples for tests 5 to 18 should be randomly selected from
the samples of tests 2 and 4. Some tests are destructive and the samples cannot be used for any further testing.
Tests 8 and 9 are performed on the same samples or on different samples.

Annex B
(normative)
Power thresholds for optical fuses
Table B.1 gives powers for optical fuses, single-mode.
Table B.1 – Powers for optical fuses, single-mode
Power threshold Recommended power for Maximum allowed
normal CW work power input, P
in max
dBm dBm dBm
18 Up to 15 Up to 36
19 Up to 16 Up to 36
20 Up to 17 Up to 36
21 Up to 18 Up to 36
22 Up to 19 Up to 36
23 Up to 20 Up to 36
24 Up to 21 Up to 36
25 Up to 22 Up to 36
26 Up to 23 Up to 36
27 Up to 24 Up to 36
28 Up to 25 Up to 36
29 Up to 26 Up to 36
30 Up to 27 Up to 36
NOTE P of 36 dBm is the maximum allowed power input into an optical fuses having
in max
power threshold up to 30 dBm. Beyond this power it is dysfunctional and can let light
through.
– 16 – IEC 61753-056-2:2012 © IEC 2012
Annex C
(informative)
Example of dimensions for optical fuses
The optical fuse configurations are shown in Figure C.1.

NOTE Typical dimensions are 6 mm diameter and 50 mm length.
Figure C.1 – Optical fuse, in-line configuration, regularly without connectors

Annex D
(normative)
Testing of optical fuses
D.1 Introductory remark
Testing of the optical fuse functionality and measuring its parameters are described in this
Annex. Testing of the following parameters, which do not appear in regular IEC standards, is
described:
• power threshold;
• blocking attenuation at threshold;
• response time.
The fuse is a safety device and only destructive testing can test its functionality; it is not
functional any more after exposure to powers over the threshold. The actual test requires high
power, and needs a dedicated test setup, designed for these measurements.
An example of a test carried out on an optical fuse will be given in this Annex, where the
optical fuse parameters are
• power threshold: (each fuse in the batch)  20 dBm ± 1dB;
• blocking attenuation at threshold >30 dB;
• response time: <100 µs.
D.2 Power threshold and blocking attenuation at threshold measurement
Measuring the threshold power is the first and most important functional test of the optical
fuse, calling to expose the rated e.g. 20 dBm optical fuse to slowly varying powers starting at
10 dBm and up to 36 dBm. The powers needed call for an oscillator (e.g. diode laser) followed
by fibre amplifiers, as demonstrated in Figure D.1.

Figure D.1 – Test set-up schematics
The power measured by the detector, as a function of input power, is providing both, the
threshold power as well as the blocking attenuation at threshold of the DUT. The insertion
loss for low and high power is provided as well.
___________
This Annex will be deleted when an IEC standard for a test method for an optical fuse is published.

– 18 – IEC 61753-056-2:2012 © IEC 2012
Figure D.2 shows a curve of the change of the IL against the P . The change of the IL that
in
occurs at threshold can be seen, the IL change from ~0 dB to >50 dB, giving more than five
orders of magnitude "protection", or blocking attenuation at threshold, being > 30 dB needed
in this example. The values of the insertion loss before and after activation are part of the
collected results.
Figure D.2 – Example of power threshold and blocking attenuation
at threshold measurements for sample 1280A of an optical fuse
D.3 Response time measurement
The response time of the optical fuse is defined as the total time where the optical fuse output
power level is higher than the predetermined optical fuse power threshold by + 1 dB. Here the
input pulse duration is 1 ms long, having a rise time of ~10 µs and a steady state power of
fuse power threshold + 3 dB. Figure D.3 illustrates the parameters.
In this case, rise time is the elapsed time for input power to reach 90 % of its steady-state
value from the time it starts.

Figure D.3 – Response time curve of an optical fuse
Schematics of the test set-up and description are shown in Figure D.4:

Figure D.4 – Response time testing set-up
A 1 550 nm wavelength laser provides the input signal, which is amplified and regenerated by
the optical pulse generator unit, controlled by a designated software program. Output power is
measured and presented graphically using an oscilloscope. Analysis of the data is carried out
using standard mathematical software.
Since the test is carried out at three different temperatures, the minimal specified temperature,
the maximal specified temperature and the average specified temperature of the optical fuse.
The DUT is placed in a thermal chamber having a stable temperature as required.
___________
– 20 – IEC 61753-056-2:2012 © IEC 2012
SOMMAIRE
AVANT-PROPOS . 21
INTRODUCTION . 23
1 Domaine d’application . 24
2 Références normatives . 24
3 Essais . 25
4 Rapports d’essai . 25
5 Exigences de performance . 25
5.1 Nombre d’échantillons, séquencement et groupement. 25
5.2 Dimensions . 26
5.3 Détails et exigences des essais . 26
Annexe A (normative) 
Exigences relatives au nombre d’échantillons et à l’origine des
produits . 33
Annexe B (normative) Seuils de puissance pour les fusibles optiques . 34
Annexe C (informative) Exemple de dimensions de fusibles optiques . 35
Annexe D (normative) Essai des fusibles optiques . 36

Figure C.1 – Fusible optique en configuration en ligne, sans connecteurs . 35
Figure D.1 – Schéma du montage d’essai . 36
Figure D.2 – Exemple de mesure de seuil de puissance et d’affaiblissement du blocage
au seuil pour l’échantillon 1280A d’un fusible optique . 37
Figure D.3 – Courbe du temps de réponse d’un fusible optique . 38
Figure D.4 – Montage pour l’essai du temps de réponse . 38

Tableau 1 – Exigences de performance des fusibles optiques (1 sur 7) . 26
Tableau A.1 – Exigences relatives au nombre d’échantillons et à l’origine des produits . 33
Tableau B.1 – Puissances pour les fusibles optiques destinés aux fibres unimodales . 34

COMMISSION ÉLECTROTECHNIQUE INTERNATIONALE
____________
DISPOSITIFS D’INTERCONNEXION
ET COMPOSANTS PASSIFS FIBRONIQUES –
NORME DE PERFORMANCE –
Partie 056-2: Fusible optique du type fibre amorce
à fibre unimodale pour catégorie C –
Environnement contrôlé
AVANT-PROPOS
1) La Commission Electrotechnique Internationale (IEC) est une organisation mondiale de normalisation
composée de l'ensemble des comités électrotechniques nationaux (Comités nationaux de l’IE
...