IEC PAS 61300-3-38:2007

Fibre optic interconnecting devices and passive components - Basic test and measurement procedures - Part 3-38: Group delay and chromatic dispersion

The purpose of this PAS is to define the measurement methods necessary to characterize the group delay properties of passive components. From these measurements further parameters like group delay ripple, linear phase deviation, chromatic dispersion, and dispersion slope can be derived. In addition, when these measurements are made with resolved polarization, the differential group delay (DGD) can also be determined as an alternative to separate measurement with the dedicated methods of IEC 61300-3-32.

General Information

• Status: Replaced
• Publication Date: 25-Apr-2007
• ICS: 33.180.20 - Fibre optic interconnecting devices
• Technical Committee: SC 86B - Fibre optic interconnecting devices and passive components
• Drafting Committee: PT 61300-3-38 - TC 86/SC 86B/PT 61300-3-38
• Current Stage: DELPUB - Deleted Publication
• Completion Date: 30-May-2012

Relations

• Replaced By: IEC 61300-3-38:2012 - Fibre optic interconnecting devices and passive components - Basic test and measurement procedures - Part 3-38: Examinations and measurements - Group delay, chromatic dispersion and phase ripple
• Effective Date: 05-Sep-2023

Standards Content (Sample)

PUBLICLY
IEC
AVAILABLE
PAS 61300-3-38
SPECIFICATION
First edition
Pre-Standard
2007-04
Fibre optic interconnecting devices
and passive components –
Basic test and measurement procedures –

Part 3-38:
Group delay and chromatic dispersion
Reference number
IEC/PAS 61300-3-38:2007(E)
All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized in any form
or by any means, electronic or mechanical, including photocopying and microfilm, without permission in writing from
either IEC or IEC's member National Committee in the country of the requester.
If you have any questions about IEC copyright or have an enquiry about obtaining additional rights to this publication,
please contact the address below or your local IEC member National Committee for further information.

IEC Central Office
3, rue de Varembé
CH-1211 Geneva 20
Switzerland
Email: [e-mail]
Web: www.iec.ch
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 corrigenda or an amendment might have been published.
ƒ Catalogue of IEC publications: www.iec.ch/searchpub
The IEC on-line Catalogue enables you to search by a variety of criteria (reference number, text, technical committee,…).
It also gives information on projects, withdrawn and replaced publications.
ƒ IEC Just Published: www.iec.ch/online_news/justpub
Stay up to date on all new IEC publications. Just Published details twice a month all new publications released. Available
on-line and also by email.
ƒ Customer Service Centre: www.iec.ch/webstore/custserv
If you wish to give us your feedback on this publication or need further assistance, please visit the Customer Service
Centre FAQ or contact us:
Email: [e-mail]
Tel.: [phone]
Fax: [phone]
PUBLICLY
IEC
AVAILABLE
PAS 61300-3-38
SPECIFICATION
First edition
Pre-Standard
2007-04
Fibre optic interconnecting devices
and passive components –
Basic test and measurement procedures –

Part 3-38:
Group delay and chromatic dispersion

PRICE CODE
Commission Electrotechnique Internationale
U
International Electrotechnical Commission
Международная Электротехническая Комиссия
For price, see current catalogue

– 2 – PAS 61300-3-38 © IEC:2007(E)
CONTENTS
FOREWORD.4
1 Scope .6
2 Normative references .6
3 Terms, definitions and abbreviations .6
4 General description .7
5 Apparatus.7
5.1 Modulation phase method .7
5.1.1 Variable wavelength source.8
5.1.2 Tracking filter.8
5.1.3 Reference branching device (RBD1, 2) .8
5.1.4 Wavelength monitor .9
5.1.5 Device under test (DUT).9
5.1.6 Detector D1, D2 (optional).9
5.1.7 RF generator .10
5.1.8 Amplitude modulator .10
5.1.9 Phase comparator.10
5.1.10 Temporary joints (TJ1-TJ2) .10
5.1.11 Polarization controller .10
5.1.12 Reference jumper .10
5.2 Swept wavelength interferometry method .10
5.2.1 Tunable laser source (TLS) .11
5.2.2 Wavelength monitor .12
5.2.3 Reference branching devices (RBD1, 2, 3) .12
5.2.4 Detectors.12
5.2.5 Polarization controller .12
5.2.6 Polarization analyser.12
6 Measurement procedure .12
6.1 Modulation phase shift method.13
6.1.1 Measurement principle .13
6.1.2 RF modulation frequency .13
6.1.3 Test sequence .15
6.1.4 Calculation of group delay.15
6.1.5 Measurement window.15
6.2 Swept wavelength interferometry method .17
6.2.1 Measurement principle .17
6.2.2 Test sequence .17
6.2.3 Calculations of group delay .18
7 Analysis .20
7.1 Noise reduction of group delay measurement .20
7.1.1 Averaging .20
7.1.2 Spectral filtering.20
7.2 Linear phase variation .20
7.3 Chromatic dispersion .20
7.3.1 Finite difference calculation.21

PAS 61300-3-38 © IEC:2007(E) – 3 –

7.3.2 Curve fit.21
8 Test results .23
Annex A (informative) Calculation of differential group delay.24
A.1 Calculation of DGD from measurements made with the MPS method at four states
of input polarization .24
A.2 Calculation of DGD from measurements made with the MPS method while
scanning the states of input polarization (“all states method”) .25
A.3 Calculation of DGD from measurements made with the SWI method .26

Figure 1 – MPS measurement method apparatus.8
Figure 2 – SWI measurement method apparatus .11
Figure 3 – Sampling at the modulation frequency .14
Figure 4 – Measurement window centred on an ITU wavelength with a defined width. .16
Figure 5 – Measurement window determined by the insertion loss curve at 3 dB .16
Figure 6 – GD and loss spectra for a 50 GHz-channel-spacing DWDM filter. .19
Figure 7 – Calculation of CD from the differentiation of the fitted GD curve with respect
to wavelength .22
Figure 8 – Fitting of a 6th order polynomial curve by least mean squares procedure to
GD data over a 25 GHz optical BW centred on the ITU frequency .22
Figure A.1 – Mueller states on Poincaré sphere.24
Figure A.2 – DGD spectrum for a 50 GHz bandpass filter measured with 30 pm
resolution BW. .27

Table A.1 – Example of Mueller set .25

– 4 – PAS 61300-3-38 © IEC:2007(E)
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
FIBRE OPTIC INTERCONNECTING DEVICES
AND PASSIVE COMPONENTS –
BASIC TEST AND MEASUREMENT PROCEDURES –

Part 3-38: Group delay and chromatic dispersion

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 provides no marking procedure to indicate its approval and cannot be rendered responsible for any
equipment declared to be in conformity with an IEC Publication.
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.
A PAS is a technical specification not fulfilling the requirements for a standard but made
available to the public.
IEC-PAS 61300-3-38 has been processed by subcommittee 86B: Fibre optic interconnecting
devices and passive components, of IEC technical committee 86: Fibre optics.
The text of this PAS is based on the This PAS was approved for
following document: publication by the P-members of the
committee concerned as indicated in
the following document:
Draft PAS Report on voting
86B/2337/PAS 86B/2380/RVD
Following publication of this PAS, which is a pre-standard publication, the technical committee
or subcommittee concerned will transform it into an International Standard.

PAS 61300-3-38 © IEC:2007(E) – 5 –

This PAS shall remain valid for an initial maximum period of three years starting from
2007-04. The validity may be extended for a single three-year period, following which it shall
be revised to become another type of normative document or shall be withdrawn.

– 6 – PAS 61300-3-38 © IEC:2007(E)
FIBRE OPTIC INTERCONNECTING DEVICES
AND PASSIVE COMPONENTS –
B
...