IEC 61202-1:2009
(Main)Fibre optic interconnecting devices and passive components - Fibre optic isolators - Part 1: Generic specification
Fibre optic interconnecting devices and passive components - Fibre optic isolators - Part 1: Generic specification
IEC 612021-1:2009 applies to isolators used in the field of fibre optics which are non-reciprocal optical devices, passive components and have two optical ports for directionally transmitting optical power. The specific technical changes with regard to the previous edition are:
- the definitions have been reconsidered;
- environmental category has been deleted from classification;
- the clause relating to quality assessment procedures has been deleted; and
- annexes A and B have been added.
Dispositifs d'interconnexion et composants passifs à fibres optiques - Isolateurs à fibres optiques - Partie 1: Spécification générique
La CEI 61202-1:2009 s'applique aux isolateurs utilisés dans le domaine des fibres optiques, possédant tous les caractéristiques ce sont des dispositifs optiques non réciproques, ce sont des dispositifs passifs et ont deux ports optiques pour les puissances optiques à émission directionnelle. Les changements techniques particuliers par rapport à l'édition précédente sont les suivants:
- les définitions ont été revues;
- la catégorie d'environnement a été retirée de la classification;
- l'article relatif aux procédures d'évaluation de la qualité a été retirée; et
- les Annexes A et B ont été ajoutées.
General Information
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Standards Content (Sample)
IEC 61202-1
®
Edition 3.0 2009-06
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
Fibre optic interconnecting devices and passive components – Fibre optic
isolators –
Part 1: Generic specification
Dispositfs d’interconnexion et composants passifs à fibres optiques – Isolateurs
à fibres optiques –
Partie 1: Spécification générique
IEC 61202-1:2009
---------------------- Page: 1 ----------------------
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---------------------- Page: 2 ----------------------
IEC 61202-1
®
Edition 3.0 2009-06
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
Fibre optic interconnecting devices and passive components – Fibre optic
isolators –
Part 1: Generic specification
Dispositfs d’interconnexion et composants passifs à fibres optiques – Isolateurs
à fibres optiques –
Partie 1: Spécification générique
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
PRICE CODE
INTERNATIONALE
U
CODE PRIX
ICS 33.180.20 ISBN 978-2-88910-445-1
® Registered trademark of the International Electrotechnical Commission
Marque déposée de la Commission Electrotechnique Internationale
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– 2 – 61202-1 © IEC:2009
CONTENTS
FOREWORD.4
1 Scope.6
2 Normative references .6
3 Terms and definitions .7
3.1 Basic term definitions .7
3.2 Component definitions.8
3.3 Performance parameter definitions .9
4 Requirements .10
4.1 Classification.10
4.1.1 General .10
4.1.2 Type.10
4.1.3 Style.11
4.1.4 Variant .12
4.1.5 Assessment level.12
4.1.6 Normative reference extensions .12
4.2 Documentation .13
4.2.1 Symbols .13
4.2.2 Specification system.13
4.2.3 Drawings .15
4.2.4 Tests and measurements.15
4.2.5 Test data sheets.15
4.2.6 Instructions for use.16
4.3 Standardization system .16
4.3.1 Interface standards.16
4.3.2 Performance standards.16
4.3.3 Reliability standards .17
4.3.4 Interlinking .17
4.4 Design and construction .18
4.4.1 Materials .18
4.4.2 Workmanship.19
4.5 Quality .19
4.6 Performance.19
4.7 Identification and marking .19
4.7.1 General .19
4.7.2 Variant identification number .19
4.7.3 Component marking .19
4.7.4 Package marking.20
4.8 Packaging .20
4.9 Storage conditions .20
4.10 Safety .20
Annex A (informative) Example of technology of bulk isolator based on magneto-optic
effect .21
Annex B (informative) Example of technology of optical waveguide isolator .23
Bibliography.26
Figure 1 – Standard system .18
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61202-1 © IEC:2009 – 3 –
Figure A.1 – Polarization-dependent optical.22
Figure A.2 – Polarization-independent optical isolator.23
Figure B.1 – Mode conversion type of the optical waveguide isolator .24
Figure B.2 – Phase shifter type of the optical waveguide isolator .25
Table 1 – Three-level IEC specification structure .13
Table 2 – Standards interlink matrix.18
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INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
FIBRE OPTIC INTERCONNECTING
DEVICES AND PASSIVE COMPONENTS –
FIBRE OPTIC ISOLATORS –
Part 1: Generic specification
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
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4) In order to promote international uniformity, IEC National Committees undertake to apply IEC Publications
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between any IEC Publication and the corresponding national or regional publication shall be clearly indicated in
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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.
International Standard IEC 61202-1 has been prepared by subcommittee 86B: Fibre optic
interconnecting devices and passive components, of IEC technical committee 86: Fibre optics.
This third edition cancels and replaces the first edition published in 2000. It constitutes a
technical revision. The specific technical changes with regard to the previous edition are as
follows.
1) The definitions have been reconsidered.
2) Environmental category has been deleted from classification.
3) The clause relating to quality assessment procedures has been deleted.
4) Annexes A and B have been added.
Future standards in this series will carry the new general title as cited above.
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61202-1 © IEC:2009 – 5 –
The text of this standard is based on the following documents:
FDIS Report on voting
86B/2845/FDIS 86B/2883/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.
A list of all parts of the IEC 61202 series, under the general title: Fibre optic interconnecting
devices and passive components – Fibre optic isolators, can be found on the IEC website.
This publication has been drafted in accordance with the ISO/IEC Directives, Part 2.
The committee has decided that the contents of this publication will remain unchanged until
the maintenance result 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.
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FIBRE OPTIC INTERCONNECTING
DEVICES AND PASSIVE COMPONENTS –
FIBRE OPTIC ISOLATORS –
Part 1: Generic specification
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 fibre
optic connector;
– they are passive devices containing no opto-electronic or other transducing elements;
– they have two optical ports for directionally transmitting optical power.
2 Normative references
The following referenced documents are indispensable for the application 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 60027 (all parts), Letter symbols to be used in electrical technology
IEC 60050(731):1991, International Electrotechnical Vocabulary – Chapter 731: Optical fibre
communication
IEC 60617 (all parts), Graphical symbols for diagrams
IEC 60695-11-5:2004, Fire hazard testing – Part 11-5: Test flames – Needle-flame test
method – Apparatus, confirmatory test arrangement and guidance
IEC 60825-1:2007, Safety of laser products – Part 1: Equipment classification and
requirements
IEC 60869-1, Fibre optic attenuators – Part 1: Generic specification
IEC 60874 (all parts), Connectors for optical fibres and cables
IEC 61073-1, Fibre optic interconnecting devices and passive components – Mechanical
splices and fusion splice protectors for optical fibres and cables – Part 1: Generic
specification
IEC 61300 (all parts), Fibre optic interconnecting devices and passive components – Basic
test and measurement procedures
IEC 61754-2, Fibre optic connector interfaces – Part 2: Type BFOC/2,5 connector family
IEC 61754-4, Fibre optic connector interfaces – Part 4: Type SC connector family
IEC 61754-13, Fibre optic connector interfaces – Part 13: Type FC-PC connector
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61202-1 © IEC:2009 – 7 –
IEC QC 01, IEC Quality Assessment System for Electronic Components (IECQ System) –
Basic Rules
IEC QC 001002-3, IEC Quality Assessment System for Electronic Components (IECQ) –
Rules of Procedure – Part 3: Approval procedures
IEC Guide 102, Electronic components – Specification structures for quality assessment
(Qualification approval and capability approval)
ISO 129-1:2004, Technical drawings – Indication of dimensions and tolerances – Part 1:
General principles
ISO 286-1:1988, ISO system of limits and fits – Part 1: Bases of tolerances, deviations and
fits
ISO 1101, Geometrical Product Specifications (GPS) – Geometrical tolerancing – Tolerances
of form, orientation, location and run-out
ISO 8601:2004, Data elements and interchange formats – Information interchange –
Representation of dates and times
3 Terms and definitions
For the purposes of this document, the terms and definitions given in IEC 60050(731) apply,
together with the following.
3.1 Basic term definitions
3.1.1
port
optical fibre or fibre optic connector attached to a passive component for the entry and/or exit
of the optical power
3.1.2
input port, output port
port designated for the ingress or regress respectively of an optical power
NOTE As a non-reciprocal device, the isolator is a directional one. The input and output port should be clearly
marked.
3.1.3
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.
3.1.4
backward direction of an optical isolator
operational direction in which the power of the optical source launches into the output port of
an isolator
NOTE The backward direction is opposite to the forward direction.
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3.2 Component definitions
3.2.1
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.
3.2.2
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 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.
3.2.3
in-line isolator
type of isolator with optical fibre for the entry input and output of the light
3.2.4
optical waveguide isolator
type of isolator with planer epitaxial magneto-optic crystal layers on a suitable substrate
NOTE The configuration of this type of isolator is compatible with the waveguide structures of the laser diode and
other optical waveguide devices and transmission lines.
3.2.5
polarization-dependent optical isolator
type of isolator not designed to have performance independent of the state of the polarization
of the incident light
3.2.6
polarization-independent optical isolator
type of isolator in which the optical performance characteristics are independent of the
polarization state of the incident light
3.2.7
polarization maintain optical isolator
type of isolator with the polarization-maintaining optical fibre for input and output, designed to
have maintain polarization of the light which is adjusted to the optical axis of the polarization-
maintaining optical fibre
3.2.8
single-stage/ dual(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
• dual(double)-stage isolator: type of isolator composed of two basic isolator units connected
in tandem for the purpose of obtaining more backward loss
3.2.9
PMD compensated optical isolator
type of isolator designed to compensate the polarization mode dispersion which is intrinsic to
the birefringent crystal
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61202-1 © IEC:2009 – 9 –
3.3 Performance parameter definitions
3.3.1
insertion loss
measure of the decrease in optical power (decibels) resulting from the insertion of an optical
isolator in its forward direction
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
P is the power of any polarized light launched at the input port.
i
NOTE 1 In the case of polarization-independent isolators, a is defined as the maximum value for any state of
f
polarization of P .
i
NOTE 2 In the case of polarization-dependent isolators, a is defined as the linearly polarized light which
f
coincides with the polarizing direction of the polarizer in the isolator of P .
i
3.3.2
isolation
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.
The measure of the decrease 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 power of any polarized light launched at the output port.
ib
3.3.3
polarization-dependent loss
PDL
for polarization-independent isolators, maximum fluctuation of a (insertion loss) for any state
f
of polarization of P
i
3.3.4
polarization mode dispersion
PMD
for polarization-independent isolators, maximum differential delay for all polarization states
when they pass through an optical isolator
3.3.5
return loss
fraction of input power that is returned from the input port of passive component and defined
as
a = –10×log (P /P ) (dB)
1 0
where
P is the optical power launched into the port;
1
is the optical power received back from the same port.
P
0
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3.3.6
operating wavelength
nominal wavelength λi, at which a passive component operates with the specified
performance
3.3.7
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
4 Requirements
4.1 Classification
4.1.1 General
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: 1 300 nm
– State of polarization: polarization-independent
Style: – Configuration: C
– Connector type: FC
– Fibre type: IEC type B 1,2
Variant: – Means of mounting
Assessment level: – ………………………
Normative reference – ………………………
extensions:
4.1.2 Type
Isolators are divided into types.
• By their fabrication technology:
– bulk isolators based on the magneto-optic effect;
– optical waveguide isolators;
– other types.
• By their polarization selectivity:
– polarization-dependent isolators;
– polarization-independent isolators;
– polarization maintain optical isolator.
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61202-1 © IEC:2009 – 11 –
• By their operational principles:
– magneto-optic Faraday effect;
– magneto-optic Cotton-Mouton effect and Kerr effect.
• By their operating wavelength:
– short wavelength isolators (e.g. 630 nm);
– long wavelength isolators (e.g. 1 300 nm, 1 550 nm);
– other wavelength isolators.
4.1.3 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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4.1.4 Variant
The isolator variant identifies those common features which encompass structurally similar
components. 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.
4.1.5 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
One additional assessment level may be added in the detail specification. When this is done,
the capital letter X shall be used.
4.1.6 Normative reference extensions
Normative reference exte
...
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