SIST EN 61202-1:2004

SLOVENSKI SIST EN 61202-1:2004

STANDARD
september 2004
Izolatorji optičnih vlaken – 1. del: Splošne specifikacije (IEC 61202-1:2000)*
Fibre optic isolators - Part 1: Generic specification (IEC 61202-1:2000)
ICS 33.180.20 Referenčna številka
SIST EN 61202-1:2004(en)
©  Standard je založil in izdal Slovenski inštitut za standardizacijo. Razmnoževanje ali kopiranje celote ali delov tega dokumenta ni dovoljeno

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EUROPEAN STANDARD EN 61202-1
NORME EUROPÉENNE
EUROPÄISCHE NORM May 2000

ICS 33.180.20


English version


Fibre optic isolators
Part 1: Generic specification
(IEC 61202-1:2000)


Isolateurs à fibres optiques Lichtwellenleiter-Isolatoren
Partie 1: Spécification générique Teil 1: Fachgrundspezifikation
(CEI 61202-1:2000) (IEC 61202-1:2000)












This European Standard was approved by CENELEC on 2000-02-01. 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 Central Secretariat 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 Central Secretariat has the same status as the official versions.

CENELEC members are the national electrotechnical committees of Austria, Belgium, Czech Republic,
Denmark, Finland, France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Netherlands, Norway,
Portugal, Spain, Sweden, Switzerland and United Kingdom.

CENELEC
European Committee for Electrotechnical Standardization
Comité Européen de Normalisation Electrotechnique
Europäisches Komitee für Elektrotechnische Normung

Central Secretariat: rue de Stassart 35, B - 1050 Brussels


© 2000 CENELEC - All rights of exploitation in any form and by any means reserved worldwide for CENELEC members.

  Ref. No. EN 61202-1:2000 E

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Page 2
EN 61202-1:2000

Foreword

The text of document 86B/1269/FDIS, future edition 2 of IEC 61202-1, prepared by IEC TC 86, Fibre optics,
was submitted to the IEC-CENELEC parallel vote and was approved by CENELEC as EN 61202-1 on
2000-02-01.

The following dates were fixed:

– latest date by which the EN has to be implemented
 at national level by publication of an identical
 national standard or by endorsement (dop) 2000-11-01

– latest date by which the national standards conflicting
 with the EN have to be withdrawn (dow) 2003-02-01
Annexes designated "normative" are part of the body of the standard.
In this standard, annex ZA is normative.
Annex ZA has been added by CENELEC.
__________

Endorsement notice

The text of the International Standard IEC 61202-1:2000 was approved by CENELEC as a European
Standard without any modification.
__________

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NORME CEI
INTERNATIONALE IEC
61202-1
INTERNATIONAL
QC 830000
STANDARD
Deuxième édition
Second edition
2000-01
Isolateurs à fibres optiques –
Partie 1:
Spécification générique
Fibre optic isolators –
Part 1:
Generic specification
 IEC 2000 Droits de reproduction réservés  Copyright - all rights reserved
Aucune partie de cette publication ne peut être reproduite ni No part of this publication may be reproduced or utilized in
utilisée sous quelque forme que ce soit et par aucun procédé, any form or by any means, electronic or mechanical,
électronique ou mécanique, y compris la photo-copie et les including photocopying and microfilm, without permission in
microfilms, sans l'accord écrit de l'éditeur. writing from the publisher.
International Electrotechnical Commission 3, rue de Varembé Geneva, Switzerland
Telefax: +41 22 919 0300 e-mail: inmail@iec.ch IEC web site http://www.iec.ch
CODE PRIX
Commission Electrotechnique Internationale
U
PRICE CODE
International Electrotechnical Commission
Pour prix, voir catalogue en vigueur
For price, see current catalogue

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61202-1 © IEC:2000 – 3 –
CONTENTS
Page
FOREWORD . 7
INTRODUCTION . 11
Clause
1 General. 13
1.1 Scope . 13
1.2 Normative references. 13
1.3 Definitions . 15
2 Requirements . 21
2.1 Classification . 21
2.1.1 Type . 21
2.1.2 Style . 23
2.1.3 Variant . 25
2.1.4 Environmental category. 25
2.1.5 Assessment level . 25
2.1.6 Normative reference extensions . 27
2.2 Documentation. 29
2.2.1 Symbols. 29
2.2.2 Specification system . 29
2.2.3 Drawings. 31
2.2.4 Tests and measurements . 33
2.2.5 Test data sheets . 33
2.2.6 Instructions for use . 35
2.3 Standardization system. 35
2.3.1 Interface standards . 35
2.3.2 Performance standards . 35
2.3.3 Reliability standards. 37
2.3.4 Interlinking . 39
2.4 Design and construction . 41
2.4.1 Materials. 41
2.4.2 Workmanship . 41
2.5 Quality. 41
2.6 Performance . 41
2.7 Identification and marking . 43
2.7.1 Variant identification number. 43
2.7.2 Component marking . 43
2.7.3 Package marking . 43
2.8 Packaging. 45
2.9 Storage conditions . 45
2.10 Safety . 45

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61202-1 © IEC:2000 – 5 –
Clause Page
3 Quality assessment procedures . 45
3.1 Primary stage of manufacture . 45
3.2 Structurally similar components . 45
3.3 Qualification approval procedures. 47
3.3.1 Fixed sample procedure. 47
3.3.2 Lot-by-lot and periodic procedure. 47
3.3.3 Qualifying specimen. 47
3.3.4 Sample size . 49
3.3.5 Preparation of specimens. 49
3.3.6 Qualification testing . 49
3.3.7 Qualification failures . 49
3.3.8 Maintenance of qualification approval . 49
3.3.9 Qualification report. 49
3.4 Quality conformance inspection . 49
3.4.1 Lot-by-lot inspection. 51
3.4.2 Periodic inspection. 51
3.5 Certified records of released lots . 53
3.6 Delayed deliveries . 53
3.7 Delivery release before completion of group B tests. 53
3.8 Alternative test methods . 53
3.9 Unchecked parameters . 53

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61202-1 © IEC:2000 – 7 –
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
FIBRE OPTIC ISOLATORS –
Part 1: Generic specification
FOREWORD
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.
6) Attention is drawn to the possibility that some of the elements of this International Standard may be the subject
of patent rights. The IEC shall not be held responsible for identifying any or all such patent rights.
International Standard IEC 61202-1 has been prepared by sub-committee 86B: Fibre optic
interconnecting devices and passive components, of IEC technical committee 86: Fibre optics.
This second edition cancels and replaces the first edition, published in 1994, and constitutes
a technical revision.
The text of this standard is based on the following documents:
FDIS Report on voting
86B/1269/FDIS 86B/1293/RVD
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 3.

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61202-1 © IEC:2000 – 9 –
IEC 61202 consists of the following parts under the general title Fibre optic isolators:
Part 1: Generic specification
Part 1-1: Blank detail specification
The QC number that appears on the front cover of this publication is the specification number
in the IEC Quality Assessment System for Electronic Components (IECQ).
The committee has decided that the contents of this publication will remain unchanged until
2008. At this date, the publication will be
• reconfirmed;
• withdrawn;
• replaced by a revised edition, or
• amended.

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61202-1 © IEC:2000 – 11 –
INTRODUCTION
This part of IEC 61202 is divided into three clauses.
The first clause is entitled “General” and contains general information pertaining to this
generic specification.
The second clause is entitled “Requirements” and contains all the requirements to be met by
isolators covered by this standard, i.e. requirements for classification, the IEC specification
system, documentation, materials, workmanship, quality, performance, identification, and
packaging.
The third clause is entitled “Quality assessment procedures” and contains all of the
procedures which need to be followed for proper quality assessment of products covered by
this standard.
NOTE Test and measurement procedures are described in IEC 61300-1, IEC 61300-2 and IEC 61300-3.

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61202-1 © IEC:2000 – 13 –
FIBRE OPTIC ISOLATORS –
Part 1: Generic specification
1 General
1.1 Scope
This part of IEC 61202 applies to isolators used in the field of fibre optics, all exhibiting the
following features:
– they are non-reciprocal optical devices, in which each port is either an optical fibre or
optical fibre connector;
– they are passive components containing no opto-electronic or other transducing elements;
– they have two optical ports for directionally transmitting optical power.
This standard establishes uniform requirements for the following points:
– fibre optic isolator requirements;
– quality assessment procedures.
1.2 Normative references
The following normative documents contain provisions which, through reference in this text,
constitute provisions of this part of IEC 61202. For dated references, subsequent
amendments to, or revisions of, any of these publications do not apply. However, parties to
agreements based on this part of IEC 61202 are encouraged to investigate the possibility of
applying the most recent editions of the normative documents indicated below. For undated
references, the latest edition of the normative document referred to applies. Members of IEC
and ISO maintain registers of currently valid International Standards.
IEC Guide 102, Electronic components – Specification structures for quality assessment
(Qualification approval and capability approval)
IEC QC 001001:1998, IEC Quality Assessment System for Electronic Components (IECQ) –
Basic Rules
IEC QC 001002-2:1998, Rules of Procedure of the IEC Quality Assessment System for
Electronic Components (IECQ) – Part 2: Documentation
IEC QC 001002-3:1998, Rules of Procedure of the IEC Quality Assessment System for
Electronic Components (IECQ) – Part 3: Approval Procedures
IEC 60027 (all parts), Letter symbols to be used in electrical technology
IEC 60050(731):1991, International Electrotechnical Vocabulary (IEV) – Chapter 731: Optical
fibre communication
IEC 60410:1973, Sampling plans and procedures for inspection by attributes
IEC 60617 (all parts), Graphical symbols for diagrams
IEC 60695-2-2:1991, Fire hazard testing – Part 2: Test methods – Section 2: Needle-flame
test

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61202-1 © IEC:2000 – 15 –
IEC 60825-1:1998, Safety of laser products – Part 1: Equipment, classification, requirements
and user’s guide
IEC 61300-1:1995, Fibre optic interconnecting devices and passive components – Basic test
and measurement procedures – Part 1: General and guidance
IEC 61300-2 (all parts), Fibre optic interconnecting devices and passive components – Basic
test and measurement procedures – Part 2: Tests
IEC 61300-3 (all parts), Fibre optic interconnecting devices and passive components – Basic
test and measurement procedures – Part 3: Examinations and measurements
ISO 129:1985, Technical drawings – Dimensioning – General principles, definitions, methods
of execution and special indications
ISO 286-1:1988, ISO system of limits and fits – Part 1: Bases of tolerances, deviations and
fits
ISO 370:1975, Toleranced dimensions – Conversion from inches into millimetres and vice
versa
ISO/DIS 1101, Geometrical Product Specifications (GPS) – Geometrical tolerancing –
Generalities, definitions, symbols, indication on drawings
ISO 8601:1988, Data elements and interchange formats – Information interchange –
Representation of dates and times
1.3 Definitions
For the purposes of this part of IEC 61202, the definitions given in IEC 60050(731) apply,
together with the following definitions:
1.3.1
fibre optic isolator
non-reciprocal optical device intended to suppress backward reflections along an optical fibre
transmission line while having minimum insertion loss in the forward direction
NOTE Fibre optic isolators are commonly used to avoid reflections back into laser diodes and optical amplifiers,
which can make the laser and amplifiers oscillate unstably, and cause noise in the fibre optic transmission system.
1.3.2
bulk isolator based on magneto-optic effect
type of isolator with discrete components including a suitable magneto-optic crystal (ferro-
magnetic crystal or paramagnetic glass, diamagnetic glass, etc.), of which the fundamental
principle is based on magneto-optic effect
EXAMPLE For instance, it consists of the following discrete components: a polarizer, a 45°
Faraday rotator and an analyser. The azimuthal angle between the polarizer and the analyser
is set at 45°. It also has its own magnetic circuit, coupling devices, etc. The incident light, with
linear polarization, will produce a 45° rotation with respect to its polarization plane in the
rotator element and pass through the isolator with lower insertion loss while the backward
light is blocked regardless of its polarization state.

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61202-1 © IEC:2000 – 17 –
1.3.3
all-fibre isolator
type of isolator in which the magneto-optic effect is produced in the optical fibre itself
1.3.4
integrated optical waveguide isolator
type of isolator with thin epitaxial magneto-optic crystal layers or electro-optic crystal layers
on a suitable substrate to obtain non-reciprocal mode conversion between TE-modes and TM-
modes
NOTE The configuration of this type of isolator is compatible with the waveguide structures of the laser diode and
other integrated optical waveguide devices and transmission lines.
1.3.5
polarization-dependent/independent optical isolator
• polarization-dependent optical isolator: type of isolator not designed to have performance
independent of the state of the polarization of the incident beam
• polarization-independent optical isolator: type of isolator in which the optical performance
characteristics are independent of the polarization state of the incident light
1.3.6
single-stage/double-stage isolator
• single-stage isolator: type of isolator composed of a basic isolator unit such as a set of
polarizer, Faraday rotator and analyser
• double-stage isolator: type of isolator composed of two basic isolator units connected in
tandem for the purpose of obtaining more backward loss
1.3.7
port
optical fibre or optical fibre connector attached to a passive component for the entry and/or
exit of the optical power
1.3.8
input port, output port
port designated for the ingress or egress respectively of an optical power
NOTE As a non-reciprocal device the isolator is a directional one. The input and output port shall be clearly
marked.
1.3.9
forward direction of an optical isolator
operational direction in which the power of the optical source launches into the input port of
an isolator
NOTE In this direction, the isolator has minimum insertion loss. The backward direction is opposite to the forward
direction.
1.3.10
forward attenuation of an optical isolator (insertion loss)
measure of the decrease in optical power (decibels) resulting from the insertion of an optical
isolator in its forward direction within a length of optical fibre or optical path. It is defined as
follows:
a = –10 log (P /P )  (dB)
f
o i
where
P is the optical power received from the output port of the isolator;
o

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61202-1 © IEC:2000 – 19 –
P is the power of linearly polarized light which coincides with the polarizing direction of the
i
polarizer in the isolator launched at the input port.
NOTE In the case of polarization-independent isolators, a is defined as the maximum value for any state of
f
polarization of P .
i
1.3.11
backward attenuation of an optical isolator (backward loss)
measure of the decrease in optical power (decibels) resulting from the insertion of an isolator
in its backward direction. The launching port is the output port and the receiving port is the
input port of the isolator. It is given by the following formula:
a = –10 log (P /P )  (dB)
b ob ib
where
P is the optical power measured at the input port of the isolator when P is launched into
ib
ob
the output port and a is defined as the minimum absolute value for any state of
b
polarization of P ;
ib
P is the optical power reflected at far end optical circuit devices in the backward direction
ib
into the output port of the isolator being measured.
1.3.12
PDL (polarization-dependent loss)
for polarization-independent isolators, maximum fluctuation of a (forward attenuation of an
f
optical isolator) for any state of polarization of P
i
1.3.13
PMD (polarization mode dispersion)
for polarization-independent isolators, maximum differential delay for all polarization states
when they pass through an optical isolator
1.3.14
operating wavelength
nominal wavelength λi, at which a passive component operates with the specified
performance
1.3.15
operating wavelength range; bandpass
specified range of wavelengths from λi min. to λi max. close to a nominal operating
wavelength λi, within which a passive component is designed to operate with the specified
performance
1.3.16
polarization adjuster (PA)
fixture or processor for adjusting the state of polarization (e.g. its direction, linearity or
density) of the incident optical beam for measurement purposes
1.3.17
interchangeable isolator
isolators which are considered to be interchangeable when they share common installation
geometry and have the same functional optic performance

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61202-1 © IEC:2000 – 21 –
2 Requirements
The requirements for isolators covered by this clause are intended to aid in classifying this
device.
2.1 Classification
Fibre optic isolators shall be classified as follows:
– type;
–style;
– variant;
– environmental category;
– assessment level;
– normative reference extensions.
An example of a typical isolator classification is as follows:
Type: – Name: Type OIFR
bulk isolators based on the
Faraday rotation
– Operating wavelength: 1,3 μm
– State of polarization: polarization independent
Style: – Configuration: C
– Connector type: FC
– Fibre type: IEC type B 1,2
Variant:
– Means of mounting
Environmental
category: ……………………….
Assessment level: ……………………….
Normative reference ……………………….
extensions:
2.1.1 Type
Isolators are divided into types.
• By their fabrication technology:
– bulk isolators based on the magneto-optic effect;
– all-fibre isolators;
– integrated optical waveguide isolators;
– other types.
• By their polarization selectivity:
– polarization-dependent isolators;
– polarization-independent isolators.
NOTE Other kinds of classification of type are available too, e.g.:
– according to the operational principles, there are designs on the basis of magneto-optic Faraday effect, Cotton-
Mouton effect and Kerr effect;
– according to the operating wavelength, there are short wavelength isolators (e.g. 0,63 μm), long wavelength
isolators (e.g. 1,30 μm, 1,55 μm), etc.

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61202-1 © IEC:2000 – 23 –
2.1.2 Style
Optical isolators may be classified into styles based upon fibre type(s), connector type(s),
cable type(s), housing shape and dimensions, and configuration. The configuration of the
isolator ports is classified as follows:
Configuration A – Device containing integral fibre optic pigtails without connector
Isolator
Pigtail Pigtail
L1 L2
IEC  1941/99
Configuration B – Device containing integral fibre optic pigtails, with a connector on each
pigtail
Isolator
Connector
Connector
L1 L2
IEC  1942/99
Configuration C – Device containing connectors as an integral part of the device housing
Isolator
Connector Connector
IEC  1943/99
Configuration D – Device containing some combination of the interfacing features of the
preceding configurations, for example:
Isolator
Pigtail
Connector
L
IEC  1944/99

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61202-1 © IEC:2000 – 25 –
2.1.3 Variant
The isolator variant identifies those common features which encompass structurally similar
components (see 3.2). Examples of features which define a variant include, but are not limited
to, the following:
– position and orientation of ports on housing;
– means of mounting.
2.1.4 Environmental category
Various environmental categories are given in the blank detail specifications associated with
this standard, which define the test sequences needed for quality assurance.
Detail specification writers may add tests and/or groups of tests to a particular environmental
category.
However, the detail specification writer shall not remove tests nor alter the sequence of an
environmental category standard.
When a detail specification writer adds tests to a specified category, the environmental
category shall be given a plus (+) designation.
EXAMPLE
– Environmental category ii +.
– Environmental category v +.
2.1.5 Assessment level
Assessment level defines the inspection levels and the acceptable quality level (AQL) of
groups A and B and the periodicity of inspection of groups C and D. Detail specifications shall
specify one or more assessment levels, each of which shall be designated by a capital letter.
The following are preferred levels:
– assessment level A:
• group A inspection: inspection level II, AQL = 4 %
• group B inspection: inspection level II, AQL = 4 %
• group C inspection: 24-month periods
• group D inspection: 48-month periods
– assessment level B:
• group A inspection: inspection level II, AQL = 1 %
• group B inspection: inspection level II, AQL = 1 %
• group C inspection: 18-month periods
• group D inspection: 36-month periods
– assessment level C:
• group A inspection: inspection level II, AQL = 0,4 %
• group B inspection: inspection level II, AQL = 0,4 %
• group C inspection: 12-month periods
• group D inspection: 24-month periods

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61202-1 © IEC:2000 – 27 –
One additional assessment level may be added in the detail specification. When this is done,
the capital letter X shall be used.
2.1.6 Normative reference extensions
Normative reference extensions are used to identify independent standards, specifications or
other reference docume
...