IEC PAS 61300-3-29:2002

Fibre optic interconnecting devices and passive components - Basic test and measurement procedures - Part 3-29: Examinations and measurements - Measurement techniques for characterizing the amplitude of the spectral transfer function of DWDM components

This document identifies two basic measurement methods for characterising the spectral transfer functions of DWDM filter components as defined in IEC 62074-1. The transfer functions can be used to produce measurements of attenuation (A), polarisation dependent loss (PDL), isolation, centre wavelength, and bandwidth (BW).

General Information

• Status: Replaced
• Publication Date: 14-Aug-2002
• ICS: 33.180.20 - Fibre optic interconnecting devices
• Technical Committee: SC 86B - Fibre optic interconnecting devices and passive components
• Drafting Committee: WG 4 - TC 86/SC 86B/WG 4
• Current Stage: DELPUB - Deleted Publication
• Completion Date: 16-Dec-2005

Relations

• Replaced By: IEC 61300-3-29:2005 - Fibre optic interconnecting devices and passive components - Basic test and measurement procedures - Part 3-29: Examinations and measurements - Measurement techniques for characterizing the amplitude of the spectral transfer function of DWDM components
• Effective Date: 05-Sep-2023

Standards Content (Sample)

IEC/PAS 61300-3-29
Edition 1.0
2002-08
PRE-STANDARD
Fibre optic interconnecting devices
and passive components –
Basic test and measurement procedures –

Part 3-29:
Examinations and measurements –
Measurement techniques for characterizing
the amplitude of the spectral transfer
function of DWDM components
PUBLICLY AVAILABLE SPECIFICATION

INTERNATIONAL Reference number
ELECTROTECHNICAL
IEC/PAS 61300-3-29
COMMISSION
IEC/PAS 61300-3-29
Edition 1.0
2002-08
PRE-STANDARD
Fibre optic interconnecting devices
and passive components –
Basic test and measurement procedures –

Part 3-29:
Examinations and measurements –
Measurement techniques for characterizing
the amplitude of the spectral transfer
function of DWDM components
PUBLICLY AVAILABLE SPECIFICATION

INTERNATIONAL Reference number
ELECTROTECHNICAL
IEC/PAS 61300-3-29
COMMISSION
– 2 – Copyright © 2002, IEC
CONTENTS
FOREWORD.3

1 Scope .4

2 Normative references .4

3 General description .4

3.1 Terms and abbreviations.5

4 Apparatus.6

4.1 Source .7

4.1.1 Tuneable laser, Method A .7
4.1.2 Broad band source (BBS), Method B .8
4.2 Polarisation controller .8
4.3 Device under test (DUT) .8
4.3.1 Device input optics.9
4.3.2 Device output optics.9
4.4 Receiver system .9
4.4.1 Broad band detectors (D1,D2), Method A.9
4.4.2 Tuneable receiver, Method B.10
4.5 Temporary joints (TJ).10
5 Procedure .10
5.1 Preparation of specimens .10
5.2 System initialisation.11
5.3 System reference measurement.11
5.3.1 Measurement of the reference spectra for method A .11
5.3.2 Measurement of reference spectra for method B.11
5.4 Measurement of device spectra.12
6 Characterisation of the device under test .12
6.1 Determination of transfer functions.12
6.1.1 Accounting for the source variations .12
6.1.2 Calculations for the Mueller matrix method .12
6.2 Calculation of attenuation (A).13
6.3 Transmission [T(λ)] spectra measurements .13
6.3.1 Peak power calculation .14
6.3.2 Normalisation of the transfer function .15

6.3.3 Bandwidth and full spectral width .15
6.3.4 Centre wavelength .16
6.3.5 Isolation.16
6.4 Polarisation dependent losses (PDL(λ)) .17
7 Details to be specified .18
7.1 Tuning sub-system .18
7.2 Power detector .18
7.3 DUT .18
Annex A   Reflection spectrum measurements .19
Annex B   Determination of the wavelength increment parameter .22
Annex C   Determination of a mean value using the shorth function.24
Annex D  Precautions using IEC 61300-3-5 and 61300-3-7 .27

INTERNATIONAL ELECTROTECHNICAL COMMISSION

___________
FIBRE OPTIC INTERCONNECTING DEVICES

AND PASSIVE COMPONENTS –
BASIC TEST AND MEASUREMENT PROCEDURES –

Part 3-29: Examinations and measurements – Measurement techniques for

characterizing the amplitude of the spectral transfer function

of DWDM components
FOREWORD
A PAS is a technical specification not fulfilling the requirements for a standard, but made available to
the public.
IEC-PAS 61300-3-29 has been processed by sub-committee 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/1699/PAS 86B/1748/RVD
Following publication of this PAS, the technical committee or subcommittee concerned will investigate
the possibility of transforming the PAS into an International Standard.
1) The IEC (International Electrotechnical Commission) is a worldwide organization for standardization comprising
all national electrotechnical committees (IEC National Committees). The object of the 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, the IEC publishes International Standards. 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. The 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 the 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 National Committees.
3) The documents produced have the form of recommendations for international use and are published in the form
of standards, technical specifications, technical reports or guides and they are accepted by the National
Committees in that sense.
4) In order to promote international unification, IEC National Committees undertake to apply IEC International
Standards transparently to the maximum extent possible in their national and regional standards. Any
divergence between the IEC Standard and the corresponding national or regional standard shall be clearly
indicated in the latter.
5) The IEC provides no marking procedure to indicate its approval and cannot be rendered responsible for any
equipment declared to be in conformity with one of its standards.
IEC 61300 consists of the following parts, under the general title: Fibre optic interconnecting
devices and passive components – Basic test and measurement procedures:
– Part 1: General and guidance
– Part 2: Tests
– Part 3: Examinations and measurements.
This PAS shall remain valid for no longer than 3 years starting from 2002-08. The validity may
be extended for a single 3-year period, following which it shall be revised to become another
type of normative document, or shall be withdrawn.

– 4 – Copyright © 2002, IEC
FIBRE OPTIC INTERCONNECTING DEVICES

AND PASSIVE COMPONENTS –
BASIC TEST AND MEASUREMENT PROCEDURES –

Part 3-29: Examinations and measurements – Measurement techniques for

characterizing the amplitude of the spectral transfer function

of DWDM components
1 Scope
The purpose of this document is to identify two basic measurement methods for
characterising the spectral transfer functions of DWDM filter components as defined in IEC
62074-1. The transfer functions can be used to produce measurements of attenuation (A),
polarisation dependent loss (PDL), isolation, centre wavelength, and bandwidth (BW).
2 Normative references
The following normative documents contain provisions which, through reference in this text,
constitute provisions of this part of IEC 61300. All normative documents are subject to
revision and parties to agreements based on this part of IEC 61300 are recommended to
apply the most recent edition. A catalogue of current IEC and ISO standards can be found on
http://www.iec.ch/ and http://www.iso.ch/ respectively.
IEC 62074-1: Fibre Optic WDM devices – Part 1 Generic specification

IEC 61300-3-2: Fibre optic interconnecting devices and passive components – Polarisation
dependence of attenuation for single mode fibre optic devices

IEC 61300-3-5: Fibre optic interconnecting devices and passive components – Wavelength
dependence of attenuation
IEC 61300-3-7: Fibre optic interconnecting devices and passive components – Wavelength
dependence of attenuation and return loss

IEC 61300-3-12: Fibre optic interconnecting devices and passive components – Polarisation
of a single-mode fibre optic component: Matrix calculation method

3 General description
This document is complementary to the wavelength dependence of attenuation (IEC
61300-3-5), the wavelength dependence of attenuation and return loss (IEC 61300-3-7),
polarisation dependence of attenuation (IEC 61300-3-2), and the polarisation dependence of
attenuation using matrix methods (IEC 61300-3-12) test procedures. It is meant to cover any
DWDM devices described by IEC 62074-1. In general, these DWDM devices have channel
bandwidths less than 1 nm, filter response slopes greater than 100 dB/nm, and out-of-band
rejection extending over tens of nm.
The methods described in this procedure will show how to obtain the transfer function from a
single input to a single output port (single conducting path). For an m × n device, it will be
required to repeat this procedure using all possible combinations of input and output ports.

The methods described in this procedure are intended to be applicable to any wavelength

band (C, L, S, O, etc.) although examples may be shown in the C-band for illustrative

purposes.
The two methods contained in this procedure differ mainly in the way in which the wavelength

resolution is obtained. Method A uses a tuneable laser source and a broad band detector,

while Method B uses a broad band source and a tuneable receiver. Method A shall be

considered the reference test method for DWDM devices. This procedure also includes

appendixes that illustrate the following:

A. Reflection spectrum measurements

B. Determination of wavelength increment parameter
C. Determination of a mean value using the shorth function
D. Precautions in using IEC 61300-3-7 for DWDM devices

3.1 Terms and abbreviations
Many of the terms and abbreviations in this document are described in the IEC generic
standard 60050-731 and the IEC WDM component standard 62074-1. Some terms and
abbreviations specific to this measurement technique are included below.
ASE Amplified spontaneous emissions
BW Bandwidth: The spectral width of a signal or filter. In case of a laser signal
such as a tuneable laser source, the term linewidth is commonly preferred.
Often defined by the width at a set power distance from the peak power level of
the device (i.e. 3 dB BW or 1 dB BW). Must be defined as the distance
between the closest crossings on either side of the centre wavelength in the
cases where the spectral shape has more than 2 such points. The distance
between the outermost crossings can be considered the full spectral width.
δ Wavelength sampling increment during the measurement.
λ  Centre channel or nominal operating wavelength for a component
h
OWR Operating wavelength range. The specified range of wavelengths from λ to
hmin
λ centred about the nominal operating wavelength, within which a WDM
hmax
device operates.
SSE Source spontaneous emission: Broad band emissions from a laser cavity that
bear no phase relation to the cavity field. These emissions can be seen as the
baseline noise on an optical spectrum analyzer.
TLS Tuneable laser source.
– 6 – Copyright © 2002, IEC
4 Apparatus
The bas
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