Optical amplifiers - Test methods - Part 1-1: Power and gain parameters - Optical spectrum analyzer method

IEC 61290-1-1:2020 is available as IEC 61290-1-1:2020 RLV which contains the International Standard and its Redline version, showing all changes of the technical content compared to the previous edition.
IEC 61290-1-1:2020 applies to all commercially available optical amplifiers (OAs) and optically amplified modules. It applies to OAs using optical fibre amplifiers (OFAs) based on either rare-earth doped fibres or on the Raman effect, semiconductor OAs (SOAs) and planar optical waveguide amplifiers (POWAs). The object of this document is to establish uniform requirements for accurate and reliable measurements, by means of the optical spectrum analyzer (OSA) test method, of the following OA parameters, as defined in IEC 61291-1:
- nominal output signal power;
- gain;
- polarization-dependent gain (PDG);
- maximum output signal power;
- maximum total output power.
In addition, this document provides the test method of:
- gain ripple (for SOAs).
NOTE All numerical values followed by (‡) are suggested values for which the measurement is assured.
The object of this document is specifically directed to single-channel amplifiers. Test methods for multichannel amplifiers are standardized in IEC 61290-10 (all parts). This fourth edition cancels and replaces the third edition published in 2015 and constitutes a technical revision. This edition includes the following significant technical change with respect to the previous edition: addition of techniques to test gain ripple of SOAs.

Amplificateurs optiques - Méthodes d'essai - Partie 1-1: Paramètres de puissance et de gain - Méthode de l'analyseur de spectre optique

IEC 61290-1-1:2020 est disponible sous forme de IEC 61290-1-1:2020 RLV qui contient la Norme internationale et sa version Redline, illustrant les modifications du contenu technique depuis l'édition précédente.
L'IEC 61290-1-1:2020 s’applique à tous les amplificateurs optiques (OA: optical amplifier) et modules à amplification optique. Elle s’applique aux amplificateurs optiques utilisant des amplificateurs à fibres optiques (OFA: optical fibre amplifier) composés de fibres dopées aux terres rares ou utilisant l’effet Raman, des amplificateurs optiques à semiconducteurs (SOA: semiconductor optical amplifier) et des amplificateurs à guide d’onde optique plan (POWA: planar optical waveguide amplifier). L'objet du présent document est d'établir des exigences uniformes pour des mesurages précis et fiables, par le biais de la méthode d'essai de l'analyseur de spectre optique (OSA: optical spectrum analyzer), des paramètres d’amplificateurs optiques donnés ci-dessous, tels qu’ils sont définis dans l'IEC 61291-1:
- puissance nominale du signal de sortie;
- gain;
- gain dépendant de la polarisation (PDG: polarization-dependent gain);
- puissance maximale du signal en sortie;
- puissance totale de sortie maximale.
En outre, la présente norme fournit la méthode d'essai suivante:
- essai d'ondulation du gain (pour amplificateurs optiques à semiconducteurs).
NOTE Toutes les valeurs numériques suivies de (‡) sont des valeurs suggérées pour lesquelles le mesurage est assuré.
L’objet du présent document est spécifiquement centré sur les amplificateurs à un seul canal. Les méthodes d'essai pour les amplificateurs à canaux multiples sont normalisées dans la série IEC 61290-10 (toutes les parties). Cette quatrième édition annule et remplace la troisième édition parue en 2015, dont elle constitue une révision technique. La présente édition inclut la modification technique majeure suivante par rapport à l'édition précédente: ajout de techniques pour soumettre aux essais l'ondulation du gain des amplificateurs optiques à semiconducteurs.

General Information

Status
Published
Publication Date
02-Sep-2020
Current Stage
PPUB - Publication issued
Completion Date
03-Sep-2020
Ref Project

Buy Standard

Standard
IEC 61290-1-1:2020 - Optical amplifiers - Test methods - Part 1-1: Power and gain parameters - Optical spectrum analyzer method
English and French language
38 pages
sale 15% off
Preview
sale 15% off
Preview

Standards Content (sample)

IEC 61290-1-1
Edition 4.0 2020-09
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
Optical amplifiers – Test methods –
Part 1-1: Power and gain parameters – Optical spectrum analyzer method
Amplificateurs optiques – Méthodes d'essai –
Partie 1-1: Paramètres de puissance et de gain – Méthode de l'analyseur de
spectre optique
IEC 61290-1-1:2020-09(en-fr)
---------------------- Page: 1 ----------------------
THIS PUBLICATION IS COPYRIGHT PROTECTED
Copyright © 2020 IEC, Geneva, Switzerland

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.

Droits de reproduction réservés. Sauf indication contraire, aucune partie de cette publication ne peut être reproduite ni

utilisée sous quelque forme que ce soit et par aucun procédé, électronique ou mécanique, y compris la photocopie et

les microfilms, sans l'accord écrit de l'IEC ou du Comité national de l'IEC du pays du demandeur. Si vous avez des

questions sur le copyright de l'IEC ou si vous désirez obtenir des droits supplémentaires sur cette publication, utilisez

les coordonnées ci-après ou contactez le Comité national de l'IEC de votre pays de résidence.

IEC Central Office Tel.: +41 22 919 02 11
3, rue de Varembé info@iec.ch
CH-1211 Geneva 20 www.iec.ch
Switzerland
About the IEC

The International Electrotechnical Commission (IEC) is the leading global organization that prepares and publishes

International Standards for all electrical, electronic and related technologies.
About IEC publications

The technical content of IEC publications is kept under constant review by the IEC. Please make sure that you have the

latest edition, a corrigendum or an amendment might have been published.

IEC publications search - webstore.iec.ch/advsearchform Electropedia - www.electropedia.org

The advanced search enables to find IEC publications by a The world's leading online dictionary on electrotechnology,

variety of criteria (reference number, text, technical containing more than 22 000 terminological entries in English

committee,…). It also gives information on projects, replaced and French, with equivalent terms in 16 additional languages.

and withdrawn publications. Also known as the International Electrotechnical Vocabulary

(IEV) online.
IEC Just Published - webstore.iec.ch/justpublished

Stay up to date on all new IEC publications. Just Published IEC Glossary - std.iec.ch/glossary

details all new publications released. Available online and once 67 000 electrotechnical terminology entries in English and

a month by email. French extracted from the Terms and Definitions clause of IEC
publications issued since 2002. Some entries have been

IEC Customer Service Centre - webstore.iec.ch/csc collected from earlier publications of IEC TC 37, 77, 86 and

If you wish to give us your feedback on this publication or need CISPR.
further assistance, please contact the Customer Service
Centre: sales@iec.ch.
A propos de l'IEC

La Commission Electrotechnique Internationale (IEC) est la première organisation mondiale qui élabore et publie des

Normes internationales pour tout ce qui a trait à l'électricité, à l'électronique et aux technologies apparentées.

A propos des publications IEC

Le contenu technique des publications IEC est constamment revu. Veuillez vous assurer que vous possédez l’édition la

plus récente, un corrigendum ou amendement peut avoir été publié.

Recherche de publications IEC - Le premier dictionnaire d'électrotechnologie en ligne au monde,

webstore.iec.ch/advsearchform avec plus de 22 000 articles terminologiques en anglais et en

La recherche avancée permet de trouver des publications IEC français, ainsi que les termes équivalents dans 16 langues

en utilisant différents critères (numéro de référence, texte, additionnelles. Egalement appelé Vocabulaire

comité d’études,…). Elle donne aussi des informations sur les Electrotechnique International (IEV) en ligne.

projets et les publications remplacées ou retirées.
Glossaire IEC - std.iec.ch/glossary

IEC Just Published - webstore.iec.ch/justpublished 67 000 entrées terminologiques électrotechniques, en anglais

Restez informé sur les nouvelles publications IEC. Just et en français, extraites des articles Termes et Définitions des

Published détaille les nouvelles publications parues. publications IEC parues depuis 2002. Plus certaines entrées

Disponible en ligne et une fois par mois par email. antérieures extraites des publications des CE 37, 77, 86 et

CISPR de l'IEC.
Service Clients - webstore.iec.ch/csc
Si vous désirez nous donner des commentaires sur cette
publication ou si vous avez des questions contactez-nous:
sales@iec.ch.
Electropedia - www.electropedia.org
---------------------- Page: 2 ----------------------
IEC 61290-1-1
Edition 4.0 2020-09
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
Optical amplifiers – Test methods –
Part 1-1: Power and gain parameters – Optical spectrum analyzer method
Amplificateurs optiques – Méthodes d'essai –
Partie 1-1: Paramètres de puissance et de gain – Méthode de l'analyseur de
spectre optique
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
INTERNATIONALE
ICS 33.180.30 ISBN 978-2-8322-8749-1

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 61290-1-1:2020 © IEC 2020
CONTENTS

FOREWORD ........................................................................................................................... 3

1 Scope .............................................................................................................................. 5

2 Normative references ...................................................................................................... 5

3 Terms, definitions, and abbreviated terms ....................................................................... 6

3.1 Terms and definitions .............................................................................................. 6

3.2 Abbreviated terms ................................................................................................... 6

4 Apparatus ........................................................................................................................ 6

4.1 Test setup ............................................................................................................... 6

4.2 Characteristics of test equipment ............................................................................ 9

5 Test sample ................................................................................................................... 11

6 Procedure ...................................................................................................................... 11

6.1 Gain and nominal output signal power .................................................................. 11

6.2 PDG variation ....................................................................................................... 12

6.3 Maximum output signal power ............................................................................... 12

6.4 Maximum total output power ................................................................................. 12

6.5 Gain ripple ............................................................................................................ 12

6.5.1 General ......................................................................................................... 12

6.5.2 Method 1 – Signal gain method ...................................................................... 13

6.5.3 Method 2 – ASE method ................................................................................ 13

6.6 Detail requirements of apparatus .......................................................................... 14

7 Calculation .................................................................................................................... 14

7.1 Nominal output signal power ................................................................................. 14

7.2 Gain ...................................................................................................................... 14

7.3 Polarization-dependent gain.................................................................................. 14

7.4 Maximum output signal power ............................................................................... 15

7.5 Maximum total output power ................................................................................. 15

7.6 Gain ripple ............................................................................................................ 15

7.6.1 Method 1 – Signal gain test method ............................................................... 15

7.6.2 Method 2 – ASE method ................................................................................ 16

8 Test results ................................................................................................................... 17

Bibliography .......................................................................................................................... 19

Figure 1 – Typical arrangement of optical spectrum analyzer test apparatus for gain

and power measurements ....................................................................................................... 7

Figure 2 – Typical arrangement of optical spectrum analyzer test apparatus for gain

ripple measurements .............................................................................................................. 8

Figure 3 – Example of gain ripple spectrum with the signal gain method ............................... 16

Figure 4 – Example of gain ripple spectrum with ASE method ............................................... 17

---------------------- Page: 4 ----------------------
IEC 61290-1-1:2020 © IEC 2020 – 3 –
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
OPTICAL AMPLIFIERS – TEST METHODS –
Part 1-1: Power and gain parameters –
Optical spectrum analyzer method
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.

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 61290-1-1 has been prepared by subcommittee 86C: Fibre optic

systems and active devices, of IEC technical committee 86: Fibre optics.

This fourth edition cancels and replaces the third edition published in 2015 and constitutes a

technical revision.

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

edition: addition of techniques to test gain ripple of SOAs.
The text of this International Standard is based on the following documents:
FDIS Report on voting
86C/1673/FDIS 86C/1687/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.
---------------------- Page: 5 ----------------------
– 4 – IEC 61290-1-1:2020 © IEC 2020

This document has been drafted in accordance with the ISO/IEC Directives, Part 2.

This document is to be used in conjunction with IEC 61290-1 and IEC 61291-1.

A list of all parts of the IEC 61290 series, published under the general title Optical amplifiers –

Test methods 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: 6 ----------------------
IEC 61290-1-1:2020 © IEC 2020 – 5 –
OPTICAL AMPLIFIERS – TEST METHODS –
Part 1-1: Power and gain parameters –
Optical spectrum analyzer method
1 Scope

This part of IEC 61290 applies to all commercially available optical amplifiers (OAs) and

optically amplified modules. It applies to OAs using optical fibre amplifiers (OFAs) based on

either rare-earth doped fibres or on the Raman effect, semiconductor OAs (SOAs) and planar

optical waveguide amplifiers (POWAs).

The object of this document is to establish uniform requirements for accurate and reliable

measurements, by means of the optical spectrum analyzer (OSA) test method, of the following

OA parameters, as defined in IEC 61291-1:
a) nominal output signal power;
b) gain;
c) polarization-dependent gain (PDG);
d) maximum output signal power;
e) maximum total output power.
In addition, this document provides the test method of:
f) gain ripple (for SOAs).

NOTE All numerical values followed by (‡) are suggested values for which the measurement is assured.

The object of this document is specifically directed to single-channel amplifiers. Test methods

for multichannel amplifiers are standardized in IEC 61290-10 (all parts) [1] .
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 61290-1, Optical amplifiers – Test methods – Part 1: Power and gain parameters

IEC 61291-1, Optical amplifiers – Part 1: Generic specification
___________
Numbers in square brackets refer to the Bibliography.
---------------------- Page: 7 ----------------------
– 6 – IEC 61290-1-1:2020 © IEC 2020
3 Terms, definitions, and abbreviated terms
3.1 Terms and definitions

For the purposes of this document, the terms and definitions given in IEC 61291-1 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
3.2 Abbreviated terms
ASE amplified spontaneous emission
DBR distributed Bragg reflector (laser diode)
DFB distributed feed-back (laser diode)
ECL external cavity laser (diode)
LED light emitting diode
OA optical amplifier
OFA optical fibre amplifier
OSA optical spectrum analyzer
PDG polarization-dependent gain
POWA planar optical waveguide amplifier
SOA semiconductor optical amplifier
4 Apparatus
4.1 Test setup

A diagram of the test set-up for gain and power measurements is given in Figure 1, showing

the set-up for calibration in Figure 1 a), the set-up for input signal power measurement in

Figure 1 b), and the set-up for output power measurement in Figure 1 c).

The test set-up for gain ripple measurements is displayed in Figure 2, showing the set-up for

calibration in Figure 2 a), the set-up for input signal power measurement in Figure 2 b), and two

different set-ups for gain ripple measurement in Figure 2 c) and Figure 2 d).
---------------------- Page: 8 ----------------------
IEC 61290-1-1:2020 © IEC 2020 – 7 –
a) – Calibration
b) – Input signal power measurement
c) – Output power measurement
Key
J1, J2 optical connector
Figure 1 – Typical arrangement of optical spectrum
analyzer test apparatus for gain and power measurements
---------------------- Page: 9 ----------------------
– 8 – IEC 61290-1-1:2020 © IEC 2020
a) – Calibration
b) – Input signal power measurement
c) – Gain ripple measurement (signal gain method)
d) – Gain ripple measurement (ASE method)
Key
J1, J2 optical connector
Figure 2 – Typical arrangement of optical spectrum
analyzer test apparatus for gain ripple measurements
---------------------- Page: 10 ----------------------
IEC 61290-1-1:2020 © IEC 2020 – 9 –
4.2 Characteristics of test equipment
The test equipment listed below, with the required characteristics, is needed.
a) Optical source
The optical source shall be either fixed wavelength or wavelength-tuneable.
– Fixed-wavelength optical source

This optical source shall generate light with a wavelength and optical power specified in

the product specification or equivalent. Unless otherwise specified, the optical source

shall emit a continuous wave with the full width at half maximum of the spectrum

narrower than 1 nm (‡). A distributed feed-back (DFB) laser, a distributed Bragg reflector

(DBR) laser, an external cavity laser (ECL) diode and a light emitting diode (LED) with

a narrow-band filter are applicable, for example. The suppression ratio for the side

modes for the DFB laser, the DBR laser, or the ECL shall be higher than 30 dB (‡). The

output power fluctuation shall be less than 0,05 dB (‡), which may be better attainable

with an optical isolator at the output port of the optical source. Spectral broadening at

the foot of the lasing spectrum shall be minimal for laser sources, and the ratio of the

source power to total spontaneous emission power of the laser shall be more than 30 dB.

– Wavelength-tuneable optical source

This optical source shall be able to generate wavelength-tuneable light within the range

specified in the product specification or equivalent. Its optical power shall be specified

in the product specification or equivalent. Unless otherwise specified, the optical source

shall emit a continuous wave with the full width at half maximum of the spectrum

narrower than 1 nm (‡). An ECL or an LED with a narrow bandpass optical filter is

applicable, for example. The suppression ratio of side modes for the ECL shall be higher

than 30 dB (‡). The output power fluctuation shall be less than 0,05 dB, which may be

more easily attainable with an optical isolator at the output port of the optical source.

Spectral broadening at the foot of the lasing spectrum shall be minimal for the ECL.

Spectral broadening at the foot of the lasing spectrum shall be minimal for laser sources,

and the ratio of the source power to total spontaneous emission power of the laser shall

be more than 30 dB.
– Narrow band wavelength-tuneable optical source

This optical source shall be able to generate wavelength-tuneable light within the range

specified in the product specification or equivalent. Its optical power shall be specified

in the product specification or equivalent. Unless otherwise specified, the optical source

shall emit a continuous wave with the full width at half maximum of the spectrum

narrower (for example, one tenth) than the gain ripple period to be measured. An ECL

or an LED with a narrow bandpass optical filter is applicable, for example. The

suppression ratio of side modes for the ECL shall be higher than 30 dB (‡). The output

power fluctuation shall be less than 0,05 dB, which may be more easily attainable with

an optical isolator at the output port of the optical source. Spectral broadening at the

foot of the lasing spectrum shall be minimal for the ECL. Spectral broadening at the foot

of the lasing spectrum shall be minimal for laser sources, and the ratio of the source

power to total spontaneous emission power of the laser shall be more than 30 dB.
The use of an LED shall be limited to small-signal gain measurements.
b) Optical power meter

It shall have a measurement uncertainty less than 0,2 dB, irrespective of the state of

polarization, within the operational wavelength bandwidth of the OA. A dynamic range 10 dB

higher than the measured gain shall be required (e.g. 40 dB).
c) Optical spectrum analyzer (OSA)

Within the operational wavelength bandwidth of the OA, the linearity of the spectral power

measurement shall be less than the desired gain uncertainty and at most 0,5 dB, and the

amplitude stability of the spectral power measurement shall be less than the desired power

uncertainty and at least less than 0,4 dB over the duration of the measurement. Polarization

dependence of the spectral power measurement shall be less than 1,0 dB. The wavelength

measurement uncertainty shall be less than 0,5 nm. A dynamic range 10 dB higher than the

---------------------- Page: 11 ----------------------
– 10 – IEC 61290-1-1:2020 © IEC 2020

measured gain shall be required (e.g. 40 dB). The spectral resolution shall be equal or less

than 1 nm.

The amplifier stability is the maximum degree of amplitude fluctuation expressed by the ratio

of the maximum and minimum optical power over the duration of the measurement.
d) Optical isolator

Optical isolators may be used to bracket the OA. The polarization-dependent loss variation

of the isolator shall be less than 0,2 dB (‡). Small wavelength dependent loss is

recommended. Optical isolation shall be more than 40 dB (‡). The reflectance from this

device shall be smaller than –40 dB (‡) at each port.
e) Variable optical attenuator

The attenuation range and stability shall be over 40 dB (‡) and less than 0,2 dB (‡),

respectively. The reflectance from this device shall be smaller than −40 dB (‡) at each port.

The attenuation stability is the maximum degree of attenuation fluctuation expressed by the

ratio of the maximum and minimum optical attenuation over the duration of the measurement

after setting a certain attenuation setpoint.
f) Polarization controller

This device shall be able to provide as input signal light all possible states of polarization

(e.g. linear, elliptical and circular). For example, the polarization controller may consist of a

linear polarizer followed by an all-fibre-type polarization controller or by a linear polarizer

followed by a quarter-wave plate rotatable by minimum of 90° and a half wave plate rotatable

by minimum of 180°. The loss variation of the polarization controller shall be less than 0,2 dB

(‡). The reflectance from this device shall be smaller than −40 dB (‡) at each port. The use

of a polarization controller is considered optional, except for the measurement of PDG, but

may also be necessary to achieve the desired uncertainty of other power and gain
parameters for OA devices exhibiting significant PDG.
g) Optical fibre jumpers

The optical fibre jumpers shall be of the same fibre category defined in IEC 60793-2-50 as

the fibres used as input and output ports of the OA, so that the mode field diameters of the

optical fibre jumpers closely match those of the input and output fibres of the OA. The

reflectance from this device shall be smaller than −40 dB (‡) at each port, and the length of

the jumper shall be shorter than 2 m. Polarization maintaining fibre shall be used for the

input fibre jumper when testing gain ripple in an SOA, if the gain ripple of the SOA is

sensitive to the state of polarization.
h) Optical connectors, J1 and J2

The connection loss repeatability shall be less than 0,4 dB. The repeatability of the

connection loss, ΔL is defined as the range of 3σ of the distribution of measured values

expressed in Formula (1):
(dB) (1)
ΔL= 3σ
where σ is the standard deviation of the measurements calculated by Formula (2):
σ Lj−L
( )
(dB) (2)
j=1
where
m is the number of measurements;
L(j) is the measurement value of the connector loss;
L is the mean value of the measurement value of the connector loss.

A minimum of ten times (m = 10) is recommended to provide a reasonable estimate of σ.

---------------------- Page: 12 ----------------------
IEC 61290-1-1:2020 © IEC 2020 – 11 –
i) Analyzer

This device shall be able to provide linear polarized light from the power emitted from the

DUT and adjust to an arbitrary polarization axis. The polarization extinction ratio shall be

more than 20 dB.
j) Non-reflective terminator

A non-reflective terminator shall be used for the ASE method of gain ripple measurement

when the SOA module does not have an isolator at the input side. The reflectance from this

device shall be smaller than −40 dB (‡) at each port.
5 Test sample

The OA under test shall operate at nominal operating conditions. If the OA is likely to cause

laser oscillations due to unwanted reflections, optical isolators shall be used to bracket the OA

under test. This will reduce signal instability and measurement uncertainty.

Except for the SOA, standard optical fibres type B-652.B or B-652.D, as defined in

IEC 60793-2-50, are recommended. However, other fibre types may be used as input/output

fibre. If fibre types other than B-652.B or B-652.D are used as input/output fibre, the mode field

diameter of the optical fibre jumpers shall closely match those of the input and output fibres of

the OA (see 4.2 g)). For measurements of the parameters of Clause 1, care shall be taken to

maintain the state of polarization of the input light during the measurement. Changes in the

polarization state of the input light can result in input optical power changes because of the

slight polarization dependency expected from all the optical components used, thus leading to

increased measurement uncertainty.
6 Procedure
6.1 Gain and nominal output signal power

This method permits the determination of gain through measurements of OA input signal power,

P , OA output power, P , and OA amplified spontaneous emission (ASE) power, P , at the

in out ASE
signal wavelength. The measurement procedures described below shall be followed:

a) set the optical source to the test wavelength specified in the product specification or

equivalent; set the optical source and the variable optical attenuator in such a way as to

provide, at the input port of the OA, the optical power P specified in the product

specification or equivalent;

b) measure P with the optical power meter, as shown in Figure 1 a), to calibrate the OSA;

c) measure P with the OSA, as shown in Figure 1 b);
d) measure P with the OSA, as shown in Fi
...

Questions, Comments and Discussion

Ask us and Technical Secretary will try to provide an answer. You can facilitate discussion about the standard in here.