Optical amplifiers - Test methods - Part 1-3: Power and gain parameters - Optical power meter method

IEC 61290-1-3:2015 applies to all commercially available optical amplifiers (OA) and optically amplified subsystems. It applies to OA using optically pumped fibres (OFA based on either rare-earth doped fibres or on the Raman effect), semiconductors (SOA), and waveguides (POWA). The object of this part of IEC 61290-1 is to establish uniform requirements for accurate and reliable measurements, by means of the optical power meter test method, of the following OA parameters, as defined in IEC 61291-1: - nominal output signal power; - gain; - polarization-dependent gain; - maximum output signal power; - maximum total output power. All numerical values followed by (‡) are suggested values for which the measurement is assured. Other values may be acceptable but should be verified. This part of IEC 61290-1 applies to single-channel amplifiers. For multichannel amplifiers, the IEC 61290-10 series applies. This third edition cancels and replaces the second edition published in 2005. This edition constitutes a technical revision. This edition includes the following significant technical changes with respect to the previous edition: - Detail description of most parameters has been described in IEC 61290-1 and removed from this part; - Description of maximum output signal power and maximum total output power are added. Keywords: optical amplifiers (OA), single-channel amplifiers, optical power meter test method

Prüfverfahren für Lichtwellenleiter-Verstärker - Teil 1-3: Optische Leistungs- und Verstärkerparameter - Verfahren mit optischem Leistungsmessgerät

Amplificateurs optiques - Méthodes d'essai - Partie 1-3: Paramètres de puissance et de gain - Méthode par appareil de mesure de la puissance optique

L'IEC 61290-1-3:2015 s'applique à tous les amplificateurs optiques (AO) et sous-systèmes à amplification optique, disponibles sur le marché. Elle s'applique aux AO utilisant des fibres pompées optiquement (AFO basé sur des fibres dopées aux terres rares ou sur l'effet Raman), des semiconducteurs (AOS), et des guides d'ondes (POWA). L'objet de la présente partie de l'IEC 61290-1 est d'établir des exigences uniformes pour des mesurages précis et fiables, par le biais de la méthode d'essai par appareil de mesure de la puissance optique, des paramètres d'AO donnés ci-dessous, tels qu'ils sont définis dans l'IEC 61291-1: - puissance nominale du signal de sortie; - gain; - gain en fonction de la polarisation; - puissance maximale du signal de sortie; - puissance totale de sortie maximale. Toutes les valeurs numériques suivies de (‡) sont des valeurs suggérées, pour lesquelles la mesure est assurée. D'autres valeurs peuvent être acceptables, mais il convient qu'elles soient vérifiées. La présente partie de l'IEC 61290-1 s'applique aux amplificateurs à un seul canal. Pour les amplificateurs à canaux multiples, la série IEC 61290-10 s'applique. Cette troisième édition annule et remplace la deuxième édition publiée en 2005. Cette édition constitue une révision technique. Cette édition inclut les modifications techniques majeures suivantes par rapport à l'édition précédente: - La description détaillée de la plupart des paramètres figure dans l'IEC 61290-1 et a donc été supprimée de la présente partie; - La description de la puissance maximale du signal de sortie et celle de la puissance totale de sortie maximale sont ajoutées. Mots clés: amplificateurs optiques (AO), aux amplificateurs à un seul canal, méthode d'essai par appareil de mesure de la puissance optique

Optični ojačevalniki - Preskusne metode - 1-3. del: Parametri moči in ojačenja - Metoda z merilnikom optične moči (IEC 61290-1-3:2015)

Ta del standarda IEC 61290-1 se uporablja za vse komercialno dostopne optične ojačevalnike (OA) in optično ojačane podsisteme. Uporablja se za optične ojačevalnike z optično črpanimi vlakni (OFA, ki temeljijo na dopiranih vlaknih redke zemljine ali Ramanovem efektu), polprevodniki (SOA) in valovodi (POWA).
OPOMBA: Uporabnost preskusnih metod iz tega standarda za razpršene Ramanove ojačevalnike je treba dodatno preučiti.
Cilj tega dela standarda IEC 61290-1 je določiti enotne zahteve za točne in zanesljive meritve z uporabo preskusne metode z merilnikom optične moči, in sicer naslednjih parametrov optičnih ojačevalnikov, kot je določeno v standardu IEC 61291-1:
a) nazivne izhodne signalne moči;
b) ojačenja;
c) ojačenja, odvisnega od polarizacije;
d) največje izhodne signalne moči;
e) največje skupne izhodne moči.
Vse številčne vrednosti, za katerimi je znak (‡), so predlagane vrednosti, za katere se zagotovi merjenje. Druge vrednosti se lahko sprejmejo, vendar naj bi se preverile.
Ta del standarda IEC 61290-1 se uporablja za enokanalne ojačevalnike. Za večkanalne ojačevalnike
se uporablja skupina standardov IEC 61290-10.

General Information

Status
Published
Publication Date
11-Jun-2015
Current Stage
6060 - Document made available
Due Date
29-Feb-2016

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Standards Content (sample)

SLOVENSKI STANDARD
SIST EN 61290-1-3:2015
01-oktober-2015
1DGRPHãþD
SIST EN 61290-1-3:2006
2SWLþQLRMDþHYDOQLNL3UHVNXVQHPHWRGHGHO3DUDPHWULPRþLLQRMDþHQMD
0HWRGD]PHULOQLNRPRSWLþQHPRþL ,(&

Optical amplifiers - Test methods - Part 1-3: Optical power and gain parameters - Optical

power meter method (IEC 61290-1-3:2015)

Prüfverfahren für Lichtwellenleiter-Verstärker - Teil 1-3: Optische Leistungs- und

Verstärkerparameter - Verfahren mit optischem Leistungsmessgerät (IEC 61290-1-
3:2015)

Amplificateurs optiques - Méthodes d'essai - Partie 1-3: Paramètres de puissance et de

gain - Méthode par appareil de mesure de la puissance optique (IEC 61290-1-3:2015)

Ta slovenski standard je istoveten z: EN 61290-1-3:2015
ICS:
33.180.30 2SWLþQLRMDþHYDOQLNL Optic amplifiers
SIST EN 61290-1-3:2015 en

2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

---------------------- Page: 1 ----------------------
SIST EN 61290-1-3:2015
---------------------- Page: 2 ----------------------
SIST EN 61290-1-3:2015
EUROPEAN STANDARD EN 61290-1-3
NORME EUROPÉENNE
EUROPÄISCHE NORM
June 2015
ICS 33.180.30 Supersedes EN 61290-1-3:2005
English Version
Optical amplifiers - Test methods - Part 1-3: Power and gain
parameters - Optical power meter method
(IEC 61290-1-3:2015)

Amplificateurs optiques - Méthodes d'essai - Partie 1-3: Prüfverfahren für Lichtwellenleiter-Verstärker - Teil 1-3:

Paramètres de puissance et de gain - Méthode par appareil Optische Leistungs- und Verstärkerparameter - Verfahren

de mesure de la puissance optique mit optischem Leistungsmessgerät
(IEC 61290-1-3:2015) (IEC 61290-1-3:2015)

This European Standard was approved by CENELEC on 2015-03-31. CENELEC members are bound to comply with the CEN/CENELEC

Internal Regulations which stipulate the conditions for giving this European Standard the status of a national standard without any alteration.

Up-to-date lists and bibliographical references concerning such national standards may be obtained on application to the CEN-CENELEC

Management Centre or to any CENELEC member.

This European Standard exists in three official versions (English, French, German). A version in any other language made by translation

under the responsibility of a CENELEC member into its own language and notified to the CEN-CENELEC Management Centre has the

same status as the official versions.

CENELEC members are the national electrotechnical committees of Austria, Belgium, Bulgaria, Croatia, Cyprus, the Czech Republic,

Denmark, Estonia, Finland, Former Yugoslav Republic of Macedonia, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia,

Lithuania, Luxembourg, Malta, the Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland,

Turkey and the United Kingdom.
European Committee for Electrotechnical Standardization
Comité Européen de Normalisation Electrotechnique
Europäisches Komitee für Elektrotechnische Normung
CEN-CENELEC Management Centre: Avenue Marnix 17, B-1000 Brussels

© 2015 CENELEC All rights of exploitation in any form and by any means reserved worldwide for CENELEC Members.

Ref. No. EN 61290-1-3:2015 E
---------------------- Page: 3 ----------------------
SIST EN 61290-1-3:2015
EN 61290-1-3:2015
Foreword

The text of document 86C/1255/CDV, future edition 3 of IEC 61290-1-3, prepared by SC 86C "Fibre

optic systems and active devices” of IEC/TC 86 “Fibre optics" was submitted to the IEC-CENELEC

parallel vote and approved by CENELEC as EN 61290-1-3:2015.
The following dates are fixed:
(dop) 2015-12-31
• latest date by which the document has to be
implemented at national level by
publication of an identical national
standard or by endorsement
• latest date by which the national (dow) 2018-03-31
standards conflicting with the
document have to be withdrawn

This document supersedes EN 61290-1-3:2005, with respect to which it constitutes a technical

revision including the following significant technical changes:

a) Detail description of most parameters has been provided in EN 61290-1 and removed from this

part;

b) Description of maximum output signal power and maximum total output power is added.

This document is to be used in conjunction with EN 61290-1.

Attention is drawn to the possibility that some of the elements of this document may be the subject of

patent rights. CENELEC [and/or CEN] shall not be held responsible for identifying any or all such

patent rights.
Endorsement notice

The text of the International Standard IEC 61290-1-3:2015 was approved by CENELEC as a

European Standard without any modification.

In the official version, for Bibliography, the following notes have to be added for the standards indicated:

IEC 60793-1-1 NOTE Harmonized as EN 60793-1-1.
IEC 60793-2-50 NOTE Harmonized as EN 60793-2-50.
IEC 60825-1 NOTE Harmonized as EN 60825-1.
IEC 60825-2 NOTE Harmonized as EN 60825-2.
IEC 60874-1 NOTE Harmonized as EN 60874-1.
IEC 61290-1-1 NOTE Harmonized as EN 61290-1-1.
IEC 61290-10 (Series) NOTE Harmonized as EN 61290-10 (Series).
---------------------- Page: 4 ----------------------
SIST EN 61290-1-3:2015
EN 61290-1-3:2015
Annex ZA
(normative)
Normative references to international publications
with their corresponding European publications

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.

NOTE 1 When an International Publication has been modified by common modifications, indicated by (mod), the relevant

EN/HD applies.

NOTE 2 Up-to-date information on the latest versions of the European Standards listed in this annex is available here:

www.cenelec.eu.
Publication Year Title EN/HD Year
IEC 60793-1-40 - Optical fibres -- Part 1-40: Measurement EN 60793-1-40 -
methods and test procedures - Attenuation
IEC 61290-1 - Optical amplifiers - Test methods - Part 1: EN 61290-1 -
Power and gain parameters
IEC 61291-1 - Optical amplifiers -- Part 1: Generic EN 61291-1 -
specification
---------------------- Page: 5 ----------------------
SIST EN 61290-1-3:2015
---------------------- Page: 6 ----------------------
SIST EN 61290-1-3:2015
IEC 61290-1-3
Edition 3.0 2015-02
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
Optical amplifiers – Test methods –
Part 1-3: Power and gain parameters – Optical power meter method
Amplificateurs optiques – Méthodes d'essai –
Partie 1-3: Paramètres de puissance et de gain – Méthode par appareil de
mesure de la puissance optique
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
INTERNATIONALE
ICS 33.180.30 ISBN 978-2-8322-2279-9

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: 7 ----------------------
SIST EN 61290-1-3:2015
– 2 – IEC 61290-1-3:2015 © IEC 2015
CONTENTS

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

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

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

3 Terms, definitions and abbreviations ............................................................................... 5

3.1 Terms and definitions .............................................................................................. 5

3.2 Abbreviations .......................................................................................................... 6

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

5 Test sample ..................................................................................................................... 9

6 Procedure ........................................................................................................................ 9

7 Calculation .................................................................................................................... 12

8 Test results ................................................................................................................... 13

Annex A (informative) Optimization of optical bandpass filter spectral width ......................... 15

Bibliography .......................................................................................................................... 16

Figure 1 – Typical arrangement of optical power meter test apparatus for

measurement .......................................................................................................................... 7

---------------------- Page: 8 ----------------------
SIST EN 61290-1-3:2015
IEC 61290-1-3:2015 © IEC 2015 – 3 –
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
OPTICAL AMPLIFIERS – TEST METHODS –
Part 1-3: Power and gain parameters –
Optical power meter 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 61290-1-3 has been prepared by subcommittee 86C: Fibre optic

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

This third edition cancels and replaces the second edition published in 2005. This edition

constitutes a technical revision.

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

edition:

a) Detail description of most parameters has been described in IEC 61290-1 and removed

from this part;

b) Description of maximum output signal power and maximum total output power are added.

---------------------- Page: 9 ----------------------
SIST EN 61290-1-3:2015
– 4 – IEC 61290-1-3:2015 © IEC 2015
The text of this standard is based on the following documents:
CDV Report on voting
86C/1255/CDV 86C/1292/RVC

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.

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

Test methods can be found on the IEC website.
This International Standard is to be used in conjunction with IEC-61290-1.

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.
___________

The first editions of some of these parts were published under the general title Optical fibre amplifiers – Basic

specification or Optical amplifier test methods.
---------------------- Page: 10 ----------------------
SIST EN 61290-1-3:2015
IEC 61290-1-3:2015 © IEC 2015 – 5 –
OPTICAL AMPLIFIERS – TEST METHODS –
Part 1-3: Power and gain parameters –
Optical power meter method
1 Scope

This part of IEC 61290-1 applies to all commercially available optical amplifiers (OA) and

optically amplified subsystems. It applies to OA using optically pumped fibres (OFA based on

either rare-earth doped fibres or on the Raman effect), semiconductors (SOA), and

waveguides (POWA).

NOTE The applicability of the test methods described in the present standard to distributed Raman amplifiers is

for further study.

The object of this part of IEC 61290-1 is to establish uniform requirements for accurate and

reliable measurements, by means of the optical power meter test method, of the following OA

parameters, as defined in IEC 61291-1:
a) nominal output signal power;
b) gain;
c) polarization-dependent gain;
d) maximum output signal power;
e) maximum total output power.

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

assured. Other values may be acceptable but should be verified.

This part of IEC 61290-1 applies to single-channel amplifiers. For multichannel amplifiers, the

IEC 61290-10 series applies.
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 60793-1-40, Optical fibres – Part 1-40: Measurement methods and test procedures –

Attenuation

IEC 61290-1, Optical amplifiers – Test methods – Part 1: Power and gain parameters

IEC 61291-1, Optical amplifiers – Part 1: Generic specification
3 Terms, definitions and abbreviations
3.1 Terms and definitions

For the purposes of this document, the terms and definitions given in IEC 61291-1 apply.

---------------------- Page: 11 ----------------------
SIST EN 61290-1-3:2015
– 6 – IEC 61290-1-3:2015 © IEC 2015
3.2 Abbreviations
ASE amplified spontaneous emission
DBR distributed Bragg reflector (laser diode)
DFB distributed feedback (laser diode)
ECL external cavity laser (diode)
FWHM full width at half maximum
LED light emitting diode
OA optical amplifier
OFA optical fibre amplifier
OSA optical spectrum analyzer
PDL polarization dependent loss
POWA planar optical waveguide amplifier
SOA semiconductor optical amplifier
4 Apparatus
A diagram of the measurement set-up is given in Figure 1.
---------------------- Page: 12 ----------------------
SIST EN 61290-1-3:2015
IEC 61290-1-3:2015 © IEC 2015 – 7 –
Optical
coupler
Optical
Polarization
Optical 1
dB power
controller
source
meter
(option)
Variable
optical
attenuator
Optical
power
meter
IEC
Figure 1a) Measurement of input signal power
Optical
coupler
Optical
Polarization
Optical
J1 J2
dB controller power
source
meter
(option)
Variable Optical
optical bandpass
filter
attenuator
Optical
power
meter
IEC
Figure 1b) Measurement of optical bandpass filter loss and jumper loss
Optical
coupler
Polarization
Optical
Optical J1
1 J2
controller OA power
source
(option)
meter
Optical
Variable
bandpass
optical
under test
filter
Optical
attenuator
power
meter
IEC
Figure 1c) Measurement of output signal power and gain
Optical
coupler
Polarization
Optical
Optical J1 J2
controller
dB OA power
source
(option) meter
Variable
optical
under test
Optical
attenuator
power
meter
IEC
Figure 1d) Measurement of total output power
Figure 1 – Typical arrangement of optical power
meter test apparatus for measurement
The test equipment listed below, with the required characteristics, is needed.

a) optical source: The optical source shall be either at fixed wavelength or wavelength-

tuneable.
---------------------- Page: 13 ----------------------
SIST EN 61290-1-3:2015
– 8 – IEC 61290-1-3:2015 © IEC 2015

– fixed-wavelength optical source: This optical source shall generate a light with a

wavelength and optical power specified in the relevant detail specification. Unless

otherwise specified, the optical source shall emit a continuous wave with FWHM of the

spectrum narrower than 1 nm (‡). A distributed feedback (DFB) laser, a distributed

Bragg reflector (DBR) laser, an external cavity laser (ECL) diode, a light emitting diode

(LED) with a narrow-band filter and a single line laser 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 a

wavelength-tuneable light within the range specified in the relevant detail specification.

Its optical power shall be specified in the relevant detail specification. Unless

otherwise specified, the optical source shall emit a continuous wave with the full width

at half maximum (FWHM) 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 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.

b) optical power meter: It shall have a measurement accuracy better than ±0,2 dB,

irrespective of the state of polarization, within the operational wavelength bandwidth of the

OA. A maximum optical input power shall be large enough [e.g. +20 dBm (‡)]. Sensitivity

shall be high enough [e.g. –40 dBm (‡)]. A dynamic range exceeding the measured gain is

required (e.g. 40 dB).

c) optical isolator: Optical isolators may be used to bracket the OA. The polarization-

dependent loss (PDL) of the isolator shall be better than 0,2 dB (‡). Optical isolation shall

be better than 40 dB (‡). The reflectance from this device shall be smaller than –40 dB (‡)

at each port.

d) variable optical attenuator: The attenuation range and stability shall be over 40 dB (‡) and

better than ± 0,1 dB (‡), respectively. The reflectance from this device shall be smaller

than –40 dB (‡) at each port.

e) 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 polarization dependent gain, but may be
necessary to achieve the desired accuracy for OA devices exhibiting significant
polarization dependent gain.

f) optical fibre jumpers: The mode field diameter of the optical fibre jumpers used should be

as close as possible to that of fibres used as input and output ports 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.

Standard optical fibres defined in IEC 60793-2-50, B1 are recommended. However, other

fiber type may be used as input/output fiber. In this case, the type of fibre will be

considered.

g) optical connectors: The connection loss repeatability shall be better than ± 0,2 dB. The

reflectance from this device shall be smaller than –40 dB (‡).

h) optical bandpass filter: The optical bandwidth (FWHM) of this device shall be less than

3 nm (‡). It shall be either wavelength-tuneable or an appropriate set of fixed bandpass

filters. During measurement, the difference between the centre wavelength of this

---------------------- Page: 14 ----------------------
SIST EN 61290-1-3:2015
IEC 61290-1-3:2015 © IEC 2015 – 9 –

bandwidth and the optical source centre wavelength shall be no more than 1,5 nm (‡). The

PDL of the bandpass filter shall be less than 0,2 dB (‡). The reflectance from this device

shall be smaller than –40 dB (‡).

NOTE 1 Optimization of optical band pass filter spectral width is discussed in Annex A.

i) optical coupler: The polarization dependence of the branching ratio of the coupler shall be

less than 0,1 dB (‡).Any unconnected port of the coupler shall be properly terminated, in

such a way as to decrease the reflectance below –40 dB (‡).

NOTE 2 The change of the state of polarization of the input light is typically negligible.

j) wavelength meter: It shall have a wavelength measurement accuracy better than 0,1 nm (‡).

If the optical source is so calibrated that the accuracy of the wavelength is better than

0,1 nm (‡), the wavelength meter is not necessary.
5 Test sample

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

oscillations due to unwanted reflections, use of optical isolators is recommended to bracket

the OA under test. This will minimize the signal instability and the measurement uncertainty.

For all parameter measurements except polarization-dependent gain, 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 may result in input optical power changes because of the

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

measurement errors.
6 Procedure

a) Nominal output signal power: The nominal output signal power is given by the minimum

output signal optical power, for an input signal optical power specified in the relevant

detail specification, and under nominal operating conditions, given in the relevant detail

specification. To find this minimum value, input and output signal power levels shall be

continuously monitored for a given duration of time and in presence of changes in the

state of polarization and other instabilities, as specified in the relevant detail specification.

The measurement procedures described below shall be followed, with reference to
Figure 1.

In order to minimize the amplified spontaneous emission (ASE) power contribution to the

signal power output from the OA, several methods may be used. The optical bandpass

filter method is given below.

1) Set the optical source at the test wavelength specified in the relevant detail

specification, measuring the input signal wavelength (e.g. with a wavelength meter).

2) Measure the branching ratio of the optical coupler through the signal power levels

exiting the two output ports with an optical power meter.

3) Measure the loss L of the optical bandpass filter and the optical fibre jumper between

the OA and the optical power meter (see Figure 1(b)) by the insertion loss technique

(see Method B in IEC 60793-1-40).

4) Activate the OA under test and evaluate the ASE power level passed through the

optical filter, PASE, by measuring the optical output power from the OA, as shown in

Figure 1(c), without input signal.

NOTE 1 In large-signal conditions, the measurement of the ASE power is sometimes omitted.

NOTE 2 For consideration of measurement uncertainty, refer to the last paragraph of Annex A, which

concerns the optimization of the optical band pass filter spectral width.

5) Set the optical source and the variable optical attenuator in such a way as to provide,

at the input port of the OA, the input optical signal power (P ) specified in the relevant

detail specification. Record the optical power (P ) measured with an optical power

meter at the other (second) output port of the optical coupler, as shown in Figure 1(a).

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SIST EN 61290-1-3:2015
– 10 – IEC 61290-1-3:2015 © IEC 2015

Instantly applying signal light into the active OA can cause the generation of an optical

surge which may damage the optical components. The input signal shall have

sufficiently small power to prevent the optical surge, when it is launched to the OA

initially. The input power shall be gradually increased to the specified level.

6) Keep the optical signal power at the OA input constant (Pin) during the following

measurements, by monitoring the second output port of the coupler and, if necessary,

setting the variable optical attenuator in such a way that the optical power (P ) exiting

the second output port of the optical coupler remains constant.

7) Connect the fibre jumpers to the input and output port of the OA under test, as shown

in Figure 1(c) and evaluate the optical output power (P ) with input signal.
out

In the case using the polarization controller, the following procedure shall be adapted.

8) Set the polarization controller at a given state of polarization as specified in the

relevant detail specification; activate the OA, and monitor, by means of the optical

power meter, the optical signal power at the output of the OA, for the specified period

of time, recording the minimum value.

9) Change the state of polarization of the input signal by means of the polarization

controller, trying to measure maximum and minimum output optical signal powers with

the optical power meter, and repeat procedure 8).

10) Repeat procedure 9) for the different states of polarization indicated in the relevant

detail specification and, finally, take the absolute minimum and maximum output
optical signal powers recorded in the various conditions: P and P .
out-min out-max

Optical connectors J1 and J2 shall not be removed during the measurement to avoid

measurement errors due to reconnection.
The measurement error shall be reduced by eliminating the effect of the ASE

simultaneously detected with the signal. This is better attainable by placing an optical

bandpass filter having the narrower passband at the output of the OA under test, as it

has been discussed in the main text. For large optical signal power levels, the optical

bandpass filter may not be necessary to achieve an accurate measurement. The use of

the optical bandpass filter is important, especially when the input signal to the OA is

small. This is be
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