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 61300-3-7:2021 describes methods available to measure the wavelength dependence of attenuation and return loss of two-port, single mode passive optical components. It is not, however, applicable to dense wavelength division multiplexing (DWDM) devices. Measurement methods of wavelength dependence of attenuation of DWDM devices are described in IEC 61300-3-29. There are two measurement cases described in this document:
a) measurement of attenuation only;
b) measurement of attenuation and return loss at the same time.
This third edition cancels and replaces the second edition published in 2009. This edition constitutes a technical revision. This edition includes the following significant technical changes with respect to the previous edition:
a) reduction of the number of alternative methods proposed to bring in-line with industry practice;
b) re-statement of the equations for insertion loss and return loss using logarithmic forms more common in the industry;
c) additional recommendations with respect to the creation of fibre terminations;
d) additional discussion on the characterization of the optical sources used in this document;
e) simplification of bi-directional testing;
f) removal of separate return loss only measurement procedures.

Dispositifs d’interconnexion et composants passifs fibroniques - Procédures fondamentales d'essais et de mesures - Partie 3-7: Examens et mesures - Affaiblissement et affaiblissement de réflexion des composants unimodaux en fonction de la longueur d’onde

IEC 61300-3-7:2021 décrit les méthodes disponibles de mesure de l’affaiblissement et de l’affaiblissement de réflexion des composants optiques passifs unimodaux à deux ports en fonction de la longueur d'onde. Elle n’est toutefois pas applicable aux dispositifs de multiplexage par répartition en longueurs d'onde à forte densité (DWDM_dense wavelength division multiplexing). Les méthodes de mesure de l’affaiblissement des dispositifs DWDM en fonction de la longueur d'onde sont décrites dans l’IEC 61300-3-29.
Le présent document décrit deux cas de mesure:
a) mesurage de l’affaiblissement uniquement;
b) mesurage simultané de l’affaiblissement et de l’affaiblissement de réflexion.
Cette troisième édition annule et remplace la deuxième édition parue en 2009. Cette édition constitue une révision technique. Cette édition inclut les modifications techniques majeures suivantes par rapport à l'édition précédente:
a) réduction du nombre de méthodes alternatives proposées afin de les rendre conformes à la pratique industrielle;
b) nouvel énoncé des équations relatives à la perte d’insertion et à l’affaiblissement de réflexion utilisant des formes logarithmiques plus courantes dans le secteur de l’industrie;
c) recommandations supplémentaires concernant la création de terminaisons de fibres;
d) analyse complémentaire de la caractérisation des sources optiques utilisées dans la présente norme;
d) simplification des essais bidirectionnels;
e) suppression de procédures de mesure distinctes par affaiblissement de réflexion uniquement.

General Information

Status
Published
Publication Date
06-Jul-2021
Current Stage
PPUB - Publication issued
Completion Date
07-Jul-2021
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IEC 61300-3-7:2021 - 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
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IEC 61300-3-7
Edition 3.0 2021-07
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
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
Dispositifs d’interconnexion et composants passifs fibroniques – Procédures
fondamentales d'essais et de mesures –
Partie 3-7: Examens et mesures – Affaiblissement et affaiblissement de réflexion
des composants unimodaux en fonction de la longueur d’onde
IEC 61300-3-7:2021-07(en-fr)
---------------------- Page: 1 ----------------------
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---------------------- Page: 2 ----------------------
IEC 61300-3-7
Edition 3.0 2021-07
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
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
Dispositifs d’interconnexion et composants passifs fibroniques – Procédures
fondamentales d'essais et de mesures –
Partie 3-7: Examens et mesures – Affaiblissement et affaiblissement de réflexion
des composants unimodaux en fonction de la longueur d’onde
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
INTERNATIONALE
ICS 33.180.20 ISBN 978-2-8322-1052-1

Warning! Make sure that you obtained this publication from an authorized distributor.

Attention! Veuillez vous assurer que vous avez obtenu cette publication via un distributeur agréé.

® Registered trademark of the International Electrotechnical Commission
Marque déposée de la Commission Electrotechnique Internationale
---------------------- Page: 3 ----------------------
– 2 – IEC 61300-3-7:2021 © IEC 2021
CONTENTS

FOREWORD ........................................................................................................................... 5

1 Scope .............................................................................................................................. 7

2 Normative references ...................................................................................................... 7

3 Terms, definitions, abbreviated terms and quantity symbols ............................................ 7

3.1 Terms and definitions .............................................................................................. 7

3.2 Abbreviated terms ................................................................................................... 8

3.3 Quantity symbols .................................................................................................... 9

4 General description ......................................................................................................... 9

4.1 General ................................................................................................................... 9

4.2 Light source and detector conditions ....................................................................... 9

4.3 General explanation of attenuation and return loss ............................................... 10

4.3.1 Attenuation .................................................................................................... 10

4.3.2 Return loss .................................................................................................... 10

4.4 Device under test (DUT) ....................................................................................... 11

4.5 Measurement methods .......................................................................................... 12

5 Apparatus ...................................................................................................................... 12

5.1 General ................................................................................................................. 12

5.2 Optical source ....................................................................................................... 13

5.2.1 Method A – Broadband light source (BBS) ..................................................... 13

5.2.2 Method B – Tuneable narrowband light source (TNLS) .................................. 13

5.2.3 Method C – Set of multiple fixed narrowband light sources (NLS) .................. 13

5.3 Depolarizer ........................................................................................................... 13

5.4 Power detection systems ...................................................................................... 14

5.4.1 Method A – Tuneable narrowband detection (TND) ........................................ 14

5.4.2 Method B and C – Broadband detection (BBD) .............................................. 14

5.5 Branching device (BD) .......................................................................................... 15

5.6 Termination ........................................................................................................... 15

5.7 Temporary joint (TJ) ............................................................................................. 15

5.8 Test patch cord ..................................................................................................... 15

5.9 Reference plugs (RP)............................................................................................ 16

5.10 Reference adapters (RA) ...................................................................................... 16

6 Procedure ...................................................................................................................... 16

6.1 Method A – Broadband light source ...................................................................... 16

6.1.1 Method A1 – Attenuation only ........................................................................ 16

6.1.2 Method A2 – Attenuation and return loss ....................................................... 17

6.2 Method B – Tuneable narrowband light source ...................................................... 20

6.2.1 General ......................................................................................................... 20

6.2.2 Method B – Attenuation only .......................................................................... 21

6.2.3 Method B – Attenuation and return loss ......................................................... 21

6.3 Method C – Set of multiple fixed narrowband light sources ................................... 22

6.3.1 General ......................................................................................................... 22

6.3.2 Method C1 – Attenuation only ........................................................................ 22

6.3.3 Method C2 – Attenuation and return loss ....................................................... 22

7 Test results ................................................................................................................... 23

---------------------- Page: 4 ----------------------
IEC 61300-3-7:2021 © IEC 2021 – 3 –

8 Details to be reported .................................................................................................... 24

8.1 General ................................................................................................................. 24

8.2 Total measurement system ................................................................................... 24

8.3 Source .................................................................................................................. 24

8.3.1 Broadband light source .................................................................................. 24

8.3.2 Tuneable or discrete narrowband light source ................................................ 24

8.3.3 Depolarizer .................................................................................................... 24

8.4 Detection system .................................................................................................. 24

8.4.1 Optical power meter....................................................................................... 24

8.4.2 Optical spectrum analyzer ............................................................................. 25

8.4.3 Branching device ........................................................................................... 25

8.4.4 Termination ................................................................................................... 25

8.4.5 Temporary joint ............................................................................................. 25

8.4.6 Reference plug .............................................................................................. 25

8.4.7 Reference adapter ......................................................................................... 25

Annex A (informative) Types of passive optical components ................................................ 26

Annex B (informative) Typical light source characteristics .................................................... 27

B.1 General ................................................................................................................. 27

B.2 Broadband light source ......................................................................................... 27

B.3 Tuneable laser source .......................................................................................... 27

Annex C (informative) Terminations ..................................................................................... 29

Bibliography .......................................................................................................................... 31

Figure 1 – Generic explanation of attenuation and return loss ............................................... 11

Figure 2 – Method A1, attenuation-only, reference measurement set-up ............................... 16

Figure 3 – Method A1, attenuation-only, DUT measurement set-up ....................................... 17

Figure 4 – Method A2, attenuation and return loss, reference branching device

measurement set-up ............................................................................................................. 18

Figure 5 – Method A2, attenuation and return loss, reference measurement set-up............... 18

Figure 6 – Method A2, system background measurement set-up ........................................... 19

Figure 7 – Method A2, attenuation and return loss, DUT measurement set-up ...................... 20

Figure 8 – Method B, tuneable narrowband light source with and without depolarizer ........... 21

Figure 9 – Method C, multiple fixed narrowband sources set-up ............................................ 22

Figure 10 – Example wavelength dependent attenuation plot ................................................ 23

Table 1 – Device under test categories ................................................................................. 11

Table 2 – Measurement methods .......................................................................................... 12

Table 3 – Reference test methods ........................................................................................ 12

Table 4 – Preferred OPM parameters .................................................................................... 15

Table 5 – Steps of method A1, attenuation only .................................................................... 16

Table 6 – Steps of method A2, attenuation and return loss ................................................... 17

Table 7 – Steps of method B, attenuation only ...................................................................... 21

Table 8 – Steps of method B, attenuation and return loss ..................................................... 21

Table 9 – Steps of method C, attenuation only ...................................................................... 22

Table 10 – Steps of method C2, attenuation and return loss ................................................. 23

---------------------- Page: 5 ----------------------
– 4 – IEC 61300-3-7:2021 © IEC 2021

Table 11 – Example report for wavelength dependent attenuation and return loss ................ 23

Table A.1 – Functional summary of common passive optical components ............................. 26

Table B.1 – Types of broadband light source (BBS) and main characteristics ....................... 27

Table B.2 – Types of tuneable light source (TLS) and main characteristics ........................... 28

Table C.1 – Impact on termination values on measured return loss ....................................... 29

Table C.2 – Impact on termination values on measured return loss uncertainty ..................... 30

---------------------- Page: 6 ----------------------
IEC 61300-3-7:2021 © IEC 2021 – 5 –
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
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
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,

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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

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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

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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.

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.

IEC 61300-3-7 has been prepared by subcommittee 86B: Fibre optic interconnecting devices

and passive components, of IEC technical committee 86: Fibre optics. It is an International

Standard.

This third edition cancels and replaces the second edition published in 2009. This edition

constitutes a technical revision.

This edition includes the following significant technical changes with respect to the previous

edition:

a) reduction of the number of alternative methods proposed to bring in-line with industry

practice;

b) re-statement of the equations for insertion loss and return loss using logarithmic forms more

common in the industry;

c) additional recommendations with respect to the creation of fibre terminations;

---------------------- Page: 7 ----------------------
– 6 – IEC 61300-3-7:2021 © IEC 2021

d) additional discussion on the characterization of the optical sources used in this document;

e) simplification of bi-directional testing;
f) removal of separate return loss only measurement procedures.
The text of this International Standard is based on the following documents:
Draft Report on voting
86B/4337/CDV 86B/4425A/RVC

Full information on the voting for its approval can be found in the report on voting indicated in

the above table.
The language used for the development of this International Standard is English.

This document was drafted in accordance with ISO/IEC Directives, Part 2, and developed in

accordance with ISO/IEC Directives, Part 1 and ISO/IEC Directives, IEC Supplement, available

at www.iec.ch/members_experts/refdocs. The main document types developed by IEC are

described in greater detail at www.iec.ch/standardsdev/publications.

A list of all parts in the IEC 61300 series, published under the general title Fibre optic

interconnecting devices and passive components – Basic test and measurement procedures,

can be found on the IEC website.

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.
---------------------- Page: 8 ----------------------
IEC 61300-3-7:2021 © IEC 2021 – 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
1 Scope

This part of IEC 61300-3 describes methods available to measure the wavelength dependence

of attenuation and return loss of two-port, single mode passive optical components. It is not,

however, applicable to dense wavelength division multiplexing (DWDM) devices. Measurement

methods of wavelength dependence of attenuation of DWDM devices are described in
IEC 61300-3-29.
There are two measurement cases described in this document:
a) measurement of attenuation only;
b) measurement of attenuation and return loss at the same time.
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 60050-731, International Electrotechnical Vocabulary (IEV) – Part 731: Optical fibre

communication (available at www.electropedia.org)

IEC 60793-2-50, Optical fibres – Part 2-50: Product specifications – Sectional specification for

class B single-mode fibres

IEC 61755-2-4, Fibre optic interconnecting devices and passive components – Connector

optical interfaces – Part 2-4: Connection parameters of non-dispersion shifted single-mode

physically contacting fibres – Non-angled for reference connection applications

IEC 61755-2-5, Fibre optic interconnecting devices and passive components – Connector

optical interfaces – Part 2-5: Connection parameters of non-dispersion shifted single-mode

physically contacting fibres – Angled for reference connection applications
IEC TR 61931, Fibre optic – Terminology

IEC 62074-1, Fibre optic interconnecting devices and passive components – Fibre optic WDM

devices – Part 1: Generic specification
3 Terms, definitions, abbreviated terms and quantity symbols
3.1 Terms and definitions

For the purposes of this document, the terms and definitions given in IEC 60050-731, IEC TR

61931 and IEC 62074-1 apply.
---------------------- Page: 9 ----------------------
– 8 – IEC 61300-3-7:2021 © IEC 2021

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.
3.2 Abbreviated terms
APC angled physical contact
ASE amplified spontaneous emission
BBD broadband detector
BBS broadband light source
BD branching device
BPON broadband passive optical network
CC coherent control
CWDM coarse wavelength division multiplexing
DFB distributed feedback
DOP degree of polarization
DUT device under test
DWDM dense wavelength division multiplexing
ECL external cavity laser
EDFA erbium doped fibre amplifier
EDFL erbium doped fibre laser
EPON ethernet passive optical network
FBG fibre Bragg grating
FEC forward error correction
FP Fabry-Perot
GPON gigabit Ethernet passive optical network
IR infra-red
LD laser diode
LED light emitting diode
NLS narrow band light source
OADM optical add drop multiplexer
OFA optical fibre amplifier
OPM optical power meter
OSA optical spectrum analyzer
PDL polarization dependent loss
PON passive optical network
RA reference adapter
RBD reference branching device
RBW resolution bandwidth
RL return loss
RP reference plug
RTM reference test method
SLED super light emitting diode
SMSR side mode suppression ratio
---------------------- Page: 10 ----------------------
IEC 61300-3-7:2021 © IEC 2021 – 9 –
SOP state of polarization
SSE source spontaneous emission
TJ temporary joint
TLS tuneable laser source
TND tuneable narrow band detection
TNLS tuneable narrow band light source
UV ultra violet
WDM wave division multiplexing
3.3 Quantity symbols
array of n (k = 1 to n) wavelengths to be measured, expressed in nm

P (λ ) input optical power to the device under test (DUT) of the k wavelength to be

i k
measured, expressed in dBm

P (λ ) output optical power from the output port of the DUT of the k wavelength to be

t k
measured, expressed in dBm

P (λ ) output optical power at the input port of the DUT propagating away from the input

r k
port of the k wavelength to be measured, expressed in dBm

P ′(λ ) output optical power at the branching port of the reference branching device (RBD)

r k
propagating away from the input port of the RBD of the k wavelength to be
measured, expressed in dBm
A(λ ) attenuation of the DUT at k wavelength, expressed in dB
RL(λ ) return loss of the DUT at k wavelength, expressed in dB

RL*(λ ) calculated return loss of the DUT at k wavelength corrected for measurement

apparatus RL, expressed in dB
(λ ) return loss of the measurement apparatus at k wavelength, expressed in dB
0 k
4 General description
4.1 General

Attenuation, A(λ ), is the relative decrease of transmitted optical power due to the insertion or

addition of a component within a fibre-optic system. Return loss, RL(λ ), is the relative optical

power reflected from a component inserted within a fibre-optic system. A(λ ) and RL(λ ) are

k k

expressed in decibels (dB) and are obtained by comparing the optical power incident on the

DUT with the optical powers transmitted or reflected at the ports of the DUT. These terms are

defined in IEC TR 61931.
4.2 Light source and detector conditions

A(λ ) and RL(λ ) are measured over a wavelength range defined by the DUT specifications. The

k k

spectral properties of the measurement system should be selected for the measurement of the

attenuation performance specification of the DUT. These properties should include:

• wavelength setting resolution (wavelength difference between two adjacent data points);

• wavelength setting uncertainty;

• 3 dB spectral bandwidth of the light source or the tuneable narrowband detector (TND);

• source spontaneous emission (SSE) noise floor relative t
...

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