IEC 60875-1:2010
(Main)Fibre optic interconnecting devices and passive components - Non-wavelength-selective fibre optic branching devices - Part 1: Generic specification
Fibre optic interconnecting devices and passive components - Non-wavelength-selective fibre optic branching devices - Part 1: Generic specification
IEC 60875-1:2010 applies to non-wavelength-selective fibre optic branching devices which:
- are passive (they contain no optoelectronic or other transducing elements) and
- have three or more ports for the entry and/or exit of optical power which is shared among these ports in a predetermined fashion. This fifth edition cancels and replaces the fourth edition published in 2000. It constitutes a technical revision. The changes with respect to the previous edition are to delete the clause of Quality assessment procedures and reconsider the constitution of this standard.
Dispositifs d'interconnexion et composants passifs à fibres optiques - Dispositifs de couplage pour fibres optiques ne dépendant pas de la longueur d'onde - Partie 1: Spécification générique
La CEI 60875-1:2010 s'applique aux dispositifs de couplage pour fibres optiques qui ne dépendent pas de la longueur d'onde. Tous présentent les caractéristiques suivantes:
- ils sont passifs, au sens où ils ne contiennent aucun élément optoélectronique ou transducteur;
- ils ont trois ports ou plus pour l'entrée et/ou la sortie de la puissance optique, et ils partagent la puissance optique parmi ces ports, selon une modalité spécifiée; les ports sont des fibres optiques ou des connecteurs à fibres optiques.
Cette cinquième édition annule et remplace la quatrième édition parue en 2000 et constitue une révision technique. Les modifications par rapport à l'édition précédente sont la suppression de l'article concernant les procédures d'assurance de la qualité et une reconsidération de la structure de la présente norme. Cette version bilingue (2010-10) remplace la version monolingue anglaise.
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Fibre optic interconnecting devices and passive components – Non-wavelength-
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Part 1: Generic specification
IEC 60875-1:2010(E)
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THIS PUBLICATION IS COPYRIGHT PROTECTED
Copyright © 2010 IEC, Geneva, Switzerland
All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized in any form
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International Standards for all electrical, electronic and related technologies.
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IEC 60875-1
®
Edition 5.0 2010-04
INTERNATIONAL
STANDARD
colour
inside
Fibre optic interconnecting devices and passive components – Non-wavelength-
selective fibre optic branching devices –
Part 1: Generic specification
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
PRICE CODE
T
ICS 33.180.20 ISBN 978-2-88910-315-7
® Registered trademark of the International Electrotechnical Commission
---------------------- Page: 3 ----------------------
– 2 – 60875-1 © IEC:2010(E)
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 Types .11
4.1.3 Style .11
4.1.4 Variant.12
4.1.5 Assessment level.12
4.1.6 Normative reference extensions .13
4.2 Documentation .14
4.2.1 Symbols.14
4.2.2 Specification system .14
4.2.3 Drawings .15
4.2.4 Measurements .16
4.2.5 Test data sheets .16
4.2.6 Instructions for use .16
4.3 Standardization system.16
4.3.1 Interface standards .16
4.3.2 Performance standards.17
4.3.3 Reliability standards.17
4.3.4 Interlinking.18
4.4 Design and construction .19
4.4.1 Materials.19
4.4.2 Workmanship .20
4.5 Quality.20
4.6 Performance requirements.20
4.7 Identification and marking.20
4.7.1 General .20
4.7.2 Variant identification number.20
4.7.3 Component marking.20
4.7.4 Package marking .21
4.8 Safety.21
Annex A (informative) Examples of technology of fibre optic branching devices.22
Bibliography .24
Figure 1 – Non-wavelength-selective branching device .11
Figure 2 – Non-wavelength-selective branching device .11
Figure 3 – Non-wavelength-selective branching device .12
Figure 4 – Non-wavelength-selective branching device .12
Figure 5 – Standards.19
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60875-1 © IEC:2010(E) – 3 –
Figure A.1 – FBT fibre.22
Figure A.2 – PLC by chemical vapour deposition .22
Figure A.3 – PLC by ion-exchange .23
Table 1 – Three-level IEC specification structure .14
Table 2 – Standards interlink matrix .19
Table 3 – Quality assurance options .19
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– 4 – 60875-1 © IEC:2010(E)
INTERNATIONAL ELECTROTECHNICAL COMMISSION
_____________
FIBRE OPTIC INTERCONNECTING
DEVICES AND PASSIVE COMPONENTS –
NON-WAVELENGTH-SELECTIVE FIBRE
OPTIC BRANCHING DEVICES –
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
Publications is accurate, IEC cannot be held responsible for the way in which they are used or for any
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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 60875-1 has been prepared by subcommittee SC86B: Fibre optic
interconnecting devices and passive components, of IEC technical committee 86: Fibre optics.
This fifth edition cancels and replaces the fourth edition published in 2000. It constitutes a
technical revision. The changes with respect to the previous edition are to delete the clause of
Quality assessment procedures and reconsider the constitution of this standard.
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60875-1 © IEC:2010(E) – 5 –
The text of this standard is based on the following documents:
FDIS Report on voting
86B/2986/FDIS 86B/3022/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 2.
The list of all parts of IEC 60875 series, published under the general title, Fibre optic
interconnecting and passive components – Non-wavelength-selective fibre optic branching
devices can be found on the IEC website.
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.
A bilingual version of this publication may be issued at a later date.
IMPORTANT – The 'colour inside' logo on the cover page of this publication indicates
that it contains colours which are considered to be useful for the correct understanding
of its contents. Users should therefore print this document using a colour printer.
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– 6 – 60875-1 © IEC:2010(E)
FIBRE OPTIC INTERCONNECTING
DEVICES AND PASSIVE COMPONENTS –
NON-WAVELENGTH-SELECTIVE FIBRE
OPTIC BRANCHING DEVICES –
Part 1: Generic specification
1 Scope
This part of IEC 60875 applies to non-wavelength-selective fibre optic branching devices, all
exhibiting the following features:
– they are passive, in that they contain no optoelectronic or other transducing elements;
– they have three or more ports for the entry and/or exit of optical power, and share optical
power among these ports in a predetermined fashion;
– the ports are optical fibres, or optical fibre connectors.
This standard establishes uniform requirements for the optical, mechanical and environmental
properties.
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, International Electrotechnical Vocabulary (IEV) – Chapter 731: Optical fibre
communication
IEC 60617-SN, Graphical symbols for diagrams
IEC 60695-11-5, Fire hazard testing – Part 11-5: Test flames – Needle-flame test method –
Apparatus, confirmatory test arrangement and guidance
IEC 60825 (all parts), Safety of laser products
IEC 61300 (all parts), Fibre optic interconnecting devices and passive components
IEC 61930, Fibre optic graphic symbology
IEC Guide 102, Electronic components – Specification structures for quality assessment
(Qualification approval and capability approval)
IECQ 01, IEC Quality Assessment System for Electronic Components (IECQ Scheme) – Basic
Rules
IECQ 001002-3, IEC Quality Assessment System for Electronic Components (IECQ) – Rules of
Procedure – Part 3: Approval procedures
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60875-1 © IEC:2010(E) – 7 –
ISO 129-1, Technical drawings – Indication of dimensions and tolerances – Part 1: General
principles
ISO 286-1, 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, 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 and the
following apply.
3.1 Basic term definitions
3.1.1
port
optical fibre or optical connector attached to a passive component for the entry (input port)
and/or exit (output port) of the optical power
3.1.2
optical pigtail
short length of jumper or cable forming an optical port for an optic component
3.1.3
transfer matrix
optical properties of a non-wavelength-selective optic branching device can be defined in terms
of an n × n matrix of coefficients, n being the number of ports, with the coefficients
representing the fractional optical power transferred between designated ports
In general, the transfer matrix T is as follows:
⎡t t ⋅ ⋅ ⋅ t ⎤
11 12 1n
⎢ ⎥
t
21
⎢ ⎥
⋅
⎢ ⎥
T =
⎢ ⎥
⋅ t
ij
⎢ ⎥
⋅
⎢ ⎥
t t
⎢ n1 nn ⎥
⎣ ⎦
where
t is the ratio of the optical power P transferred out of port j with respect to input power P
i
ij ij
into port i, that is:
t = P /P
i
ij ij
The transfer matrix is used to classify the different types of non-wavelength-selective
branching devices which are specified in this generic specification.
In a non-wavelength-selective branching device, the coefficients t may be a function of the
ij
input wavelength, input polarization or modal power distribution. The values of these
parameters are provided in the detail specification, when necessary.
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Single-mode, non-wavelength-selective branching devices may operate in a coherent fashion
with respect to multiple inputs. Consequently, the transfer coefficients may be affected by the
relative phase and intensity of simultaneous coherent optical power inputs at two or more ports
3.1.4
transfer coefficient
element t of the transfer matrix
ij
3.1.5
logarithmic transfer matrix
in general, the logarithmic transfer matrix is as follows:
a a ⋅ ⋅ ⋅ a
⎡ ⎤
11 12 1n
⎢ ⎥
a
21
⎢ ⎥
⋅
⎢ ⎥
A =
⎢⋅ a ⎥
ij
⎢ ⎥
⋅
⎢ ⎥
a a
⎢ n1 nn ⎥
⎣ ⎦
where
a is the optical power reduction in decibels out of port j with unit power into port i, that is:
ij
a = –10 log t
ij ij
where t is the transfer matrix coefficient
ij
3.1.6
conducting ports
two ports i and j between which t is nominally greater than zero
ij
3.1.7
isolated ports
two ports i and j between which t is nominally zero, and a is nominally infinite
ij ij
3.2 Component definitions
3.2.1
non-wavelength-selective branching device
passive component possessing three or more ports which operates over a specified range of
wavelengths and shares the optical power coming into an input port among its output ports in a
predetermined fashion, without any amplification, switching, or other active modulation
3.2.2
splitter
term frequently used as a synonym for a non-wavelength-selective branching device with 1 or 2
entries (input ports) and more then 4 exits (output ports) designed and intended to produce
equal optical power at the output ports
3.2.3
coupler
term frequently used as a synonym for a non-wavelength-selective branching device with 1 or 2
entries (input ports) and 4 or less exits (output ports) or with M entries (input ports) and up to N
exits (output ports) where the number of exits (output ports) is larger then one (N>1)
3.2.4
symmetric non-wavelength-selective branching device
device whose transfer matrix is diagonally symmetric, i.e. where for all i and j, t and t are
ij ji
nominally equal
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60875-1 © IEC:2010(E) – 9 –
3.2.5
asymmetric non-wavelength-selective branching device
device whose transfer matrix is diagonally asymmetric, i.e. where there exists at least one i and
j for which t and t are nominally unequal
ij ij
3.2.6
balanced coupler
term frequently used as a synonym for a symmetric non-wavelength-selective branching
device which is designed and intended to produce that each output port power from the same
input port is equal
3.2.7
unbalanced coupler
term frequently used as a synonym for a asymmetric non-wavelength-selective branching
device which is designed and intended to produce that power at each output port is different
3.2.8
tap-coupler
term frequently used as a synonym for a unbalanced coupler, typically the coupling ratio is from
1 % to 20 %
3.2.9
polarization dependent loss
PDL
maximum variation of insertion loss due to a variation of the state of polarization (SOP) over
all the SOPs
3.3 Performance parameter definitions
3.3.1
insertion loss
element, a (where i ≠ j), of the logarithmic transfer matrix; reduction in optical power between
ij
an input and output port of a passive component expressed in decibels and defined as
a = –10 log (P /P )
1 0
where
P is the optical power launched into the input port;
0
P is the optical power received from the output port
1
3.3.2
return loss
element, a (where i = j), of the logarithmic transfer matrix; fraction of input power that is
ij
returned from the input port of a passive component and defined as
RL = –10 log (P /P )
1 0
where
P is the optical power launched into the input port;
0
P is the optical power received back from the same port
1
3.3.3
directivity
value of a between two isolated ports
ij
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– 10 – 60875-1 © IEC:2010(E)
3.3.4
excess loss
total power lost in a non-wavelength-selective branching device when an optical signal is
launched into port i, defined as
EL = −10 log t
i ∑ ij
j
where the summation is performed only over those values j for which i and j are conducting
ports. For a non-wavelength-selective branching device with N input ports, there is an array of
N values of excess loss, one for each input port i.
3.3.5
uniformity
logarithmic transfer matrix of a branching device may contain a specified set of coefficients
which are nominally finite and equal. In this case, the range of these coefficients a , expressed
ij
in decibels, is termed the uniformity of the branching device
3.3.6
coupling ratio
for a given input port i, the ratio of light at a given output port k to the total light from all output
ports and defined as
CR = t t
ik ik ij
∑
j
where j represents the operational output ports
3.3.7
operating wavelength
nominal wavelength λ, at which a passive component is designed to operate with the specified
performance
3.3.8
operating wavelength range
specified range of wavelengths from λ to λ about a nominal operating wavelength λ ,
i min i max i
within which a passive component is designed to operate with the specified performance
NOTE For a non-wavelength-selective branching device with more than one operating wavelength, the
corresponding wavelength ranges are not necessarily equal.
4 Requirements
4.1 Classification
4.1.1 General
Non-wavelength-selective branching devices shall be classified as follows:
– type;
– style;
– variant;
– performance standard grad;
– assessment level;
– normative reference extensions.
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60875-1 © IEC:2010(E) – 11 –
4.1.2 Types
The main characteristics of each type are as follows:
– transmissive or reflective;
– bidirectional or unidirectional;
– tree or star;
– any combination of the above.
4.1.3 Style
4.1.3.1 General
Non-wavelength-selective branching devices may be classified into styles based on the fibre
type(s), the connector type(s), cable type(s), housing shape, and the configuration. The
configuration of branching device ports are classified as follows:
4.1.3.2 Configuration A
Device containing integral fibre optic pigtails, without connectors.
EXAMPLE
IEC 665/10
Figure 1 – Non-wavelength-selective branching device
4.1.3.3 Configuration B
Device containing integral fibre optic pigtails, with a connector on each pigtail.
EXAMPLE
IEC 666/10
Figure 2 – Non-wavelength-selective branching device
4.1.3.4 Configuration C
Device containing fibre optic connectors as an integral part of the device housing.
---------------------- Page: 13 ----------------------
– 12 – 60875-1 © IEC:2010(E)
EXAMPLE
IEC 667/10
Figure 3 – Non-wavelength-selective branching device
4.1.3.5 Configuration D
Device containing some combination of the interfacing features of the preceding configurations.
EXAMPLE
IEC 668/10
Figure 4 – Non-wavelength-selective branching device
4.1.4 Variant
The branching device 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:
– orientation of ports;
– 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 the 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 %;
---------------------- Page: 14 ----------------------
60875-1 © IEC:2010(E) – 13 –
– 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 extensions are used to identify the integration of independent standards
specifications or other reference documents into blank detail specifications.
Unless otherwise specified, additional requirements imposed by an extension are mandatory.
Usage is primarily intended to merge associated components to form hybrid devices or
integrated functional application requirements that are dependent on technical expertise used
for other than fibre optics.
Published reference documents produced by ITU, consistent with the scope of the relevant IEC
specification series may be used as extension.
Some optical splice configurations require special qualification provisions which shall not be
imposed universally. This accommodates individual component design configurations,
specialized field tooling or specific application processes. In this case, requirements necessary
to assure repeatable performance or adequate safety, and provide additional guidance for
complete product specification. These extensions are mandatory whenever used to prepare,
assemble or install an optical splice either for field application usage or preparation of
qualification test specimens. The relevant specification shall clarify all stipulations. However,
design and style dependent extensions shall not be imposed universally.
In the event of conflicting requirements, precedence, in descending order, shall be generic over
mandatory extension, over blank detail, over detail, over application specific extension.
Examples of optical connector extensions are given as follows:
• Using IEC 61754-4 and IEC 61754-15 to partially define a future specification of the
IEC 60874 series for a duplex type SC/LSH hybrid connector adapter.
• Using IEC 61754-13 and IEC 60869-1 to partially define a future specification of the
IEC 60874 series for an integrated type "FC" preset attenuated optical connector.
• Using IEC 61754-15 and IEC 61754-4 to partially define a future specification of the
IEC 60874 series for a duplex LSH receptacle incorporating integral mechanical splices.
Other examples of requirements for normative extensions are as follows:
a) Some commercial or residential building applications may require direct reference to
specific safety codes and regulations or incorporate other specific material flammability or
toxicity requirements for specialized locations.
b) Specialized field tooling may require an extension to implement specific ocular safety,
electrical shock, burn hazard avoidance requirements, or require isolation procedures to
prevent potential ignition of combustible gases.
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– 14 – 60875-1 © IEC:2010(E)
4.2 Documentation
4.2.1 Symbols
Graphical and letter symbols shall, whenever possible, be taken from IEC 60027, IEC 6061
...
IEC 60875-1
®
Edition 5.0 2010-04
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
colour
inside
Fibre optic interconnecting devices and passive components – Non-wavelength-
selective fibre optic branching devices –
Part 1: Generic specification
Dispositifs d'interconnexion et composants passifs à fibres optiques –
Dispositifs de couplage pour fibres optiques ne dépendant pas de la longueur
d'onde –
Partie 1: Spécification générique
IEC 60875-1:2010
---------------------- Page: 1 ----------------------
THIS PUBLICATION IS COPYRIGHT PROTECTED
Copyright © 2010 IEC, Geneva, Switzerland
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
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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
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in English and French, with equivalent terms in additional languages. Also known as the International Electrotechnical
Vocabulary online.
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---------------------- Page: 2 ----------------------
IEC 60875-1
®
Edition 5.0 2010-04
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
colour
inside
Fibre optic interconnecting devices and passive components – Non-wavelength-
selective fibre optic branching devices –
Part 1: Generic specification
Dispositifs d'interconnexion et composants passifs à fibres optiques –
Dispositifs de couplage pour fibres optiques ne dépendant pas de la longueur
d'onde –
Partie 1: Spécification générique
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
PRICE CODE
INTERNATIONALE
T
CODE PRIX
ICS 33.180.20 ISBN 978-2-88912-187-8
® Registered trademark of the International Electrotechnical Commission
Marque déposée de la Commission Electrotechnique Internationale
---------------------- Page: 3 ----------------------
– 2 – 60875-1 © IEC:2010
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 Types .11
4.1.3 Style .11
4.1.4 Variant.12
4.1.5 Assessment level.12
4.1.6 Normative reference extensions .13
4.2 Documentation .14
4.2.1 Symbols.14
4.2.2 Specification system .14
4.2.3 Drawings .15
4.2.4 Measurements .16
4.2.5 Test data sheets .16
4.2.6 Instructions for use .16
4.3 Standardization system.16
4.3.1 Interface standards .16
4.3.2 Performance standards.17
4.3.3 Reliability standards.17
4.3.4 Interlinking.18
4.4 Design and construction .19
4.4.1 Materials.19
4.4.2 Workmanship .20
4.5 Quality.20
4.6 Performance requirements.20
4.7 Identification and marking.20
4.7.1 General .20
4.7.2 Variant identification number.20
4.7.3 Component marking.20
4.7.4 Package marking .21
4.8 Safety.21
Annex A (informative) Examples of technology of fibre optic branching devices.22
Bibliography .24
Figure 1 – Non-wavelength-selective branching device .11
Figure 2 – Non-wavelength-selective branching device .11
Figure 3 – Non-wavelength-selective branching device .12
Figure 4 – Non-wavelength-selective branching device .12
Figure 5 – Standards.19
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60875-1 © IEC:2010 – 3 –
Figure A.1 – FBT fibre.22
Figure A.2 – PLC by chemical vapour deposition .22
Figure A.3 – PLC by ion-exchange .23
Table 1 – Three-level IEC specification structure .14
Table 2 – Standards interlink matrix .19
Table 3 – Quality assurance options .19
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– 4 – 60875-1 © IEC:2010
INTERNATIONAL ELECTROTECHNICAL COMMISSION
_____________
FIBRE OPTIC INTERCONNECTING
DEVICES AND PASSIVE COMPONENTS –
NON-WAVELENGTH-SELECTIVE FIBRE
OPTIC BRANCHING DEVICES –
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
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 60875-1 has been prepared by subcommittee SC86B: Fibre optic
interconnecting devices and passive components, of IEC technical committee 86: Fibre optics.
This fifth edition cancels and replaces the fourth edition published in 2000. It constitutes a
technical revision. The changes with respect to the previous edition are to delete the clause of
Quality assessment procedures and reconsider the constitution of this standard.
This bilingual version (2010-10) replaces the English version.
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60875-1 © IEC:2010 – 5 –
The text of this standard is based on the following documents:
FDIS Report on voting
86B/2986/FDIS 86B/3022/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.
The French version of this standard has not been voted upon.
This publication has been drafted in accordance with the ISO/IEC Directives, Part 2.
The list of all parts of IEC 60875 series, published under the general title, Fibre optic
interconnecting and passive components – Non-wavelength-selective fibre optic branching
devices can be found on the IEC website.
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.
IMPORTANT – The 'colour inside' logo on the cover page of this publication indicates
that it contains colours which are considered to be useful for the correct understanding
of its contents. Users should therefore print this document using a colour printer.
---------------------- Page: 7 ----------------------
– 6 – 60875-1 © IEC:2010
FIBRE OPTIC INTERCONNECTING
DEVICES AND PASSIVE COMPONENTS –
NON-WAVELENGTH-SELECTIVE FIBRE
OPTIC BRANCHING DEVICES –
Part 1: Generic specification
1 Scope
This part of IEC 60875 applies to non-wavelength-selective fibre optic branching devices, all
exhibiting the following features:
– they are passive, in that they contain no optoelectronic or other transducing elements;
– they have three or more ports for the entry and/or exit of optical power, and share optical
power among these ports in a predetermined fashion;
– the ports are optical fibres, or optical fibre connectors.
This standard establishes uniform requirements for the optical, mechanical and environmental
properties.
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, International Electrotechnical Vocabulary (IEV) – Chapter 731: Optical fibre
communication
IEC 60617-SN, Graphical symbols for diagrams
IEC 60695-11-5, Fire hazard testing – Part 11-5: Test flames – Needle-flame test method –
Apparatus, confirmatory test arrangement and guidance
IEC 60825 (all parts), Safety of laser products
IEC 61300 (all parts), Fibre optic interconnecting devices and passive components – Basic test
and measurement procedures
IEC 61930, Fibre optic graphic symbology
IEC Guide 102, Electronic components – Specification structures for quality assessment
(Qualification approval and capability approval)
IECQ 01, IEC Quality Assessment System for Electronic Components (IECQ Scheme) – Basic
Rules
IECQ 001002-3, IEC Quality Assessment System for Electronic Components (IECQ) – Rules of
Procedure – Part 3: Approval procedures
---------------------- Page: 8 ----------------------
60875-1 © IEC:2010 – 7 –
ISO 129-1, Technical drawings – Indication of dimensions and tolerances – Part 1: General
principles
ISO 286-1, 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, 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 and the
following apply.
3.1 Basic term definitions
3.1.1
port
optical fibre or optical connector attached to a passive component for the entry (input port)
and/or exit (output port) of the optical power
3.1.2
optical pigtail
short length of jumper or cable forming an optical port for an optic component
3.1.3
transfer matrix
optical properties of a non-wavelength-selective optic branching device can be defined in terms
of an n × n matrix of coefficients, n being the number of ports, with the coefficients
representing the fractional optical power transferred between designated ports
In general, the transfer matrix T is as follows:
⎡t t ⋅ ⋅ ⋅ t
⎤
11 12 1n
⎢ ⎥
t
21
⎢ ⎥
⋅
⎢ ⎥
T =
⎢⋅ t ⎥
ij
⎢ ⎥
⋅
⎢ ⎥
t t
⎢ n1 nn⎥
⎣ ⎦
where
t is the ratio of the optical power P transferred out of port j with respect to input power P
i
ij ij
into port i, that is:
t = P /P
i
ij ij
The transfer matrix is used to classify the different types of non-wavelength-selective
branching devices which are specified in this generic specification.
In a non-wavelength-selective branching device, the coefficients t may be a function of the
ij
input wavelength, input polarization or modal power distribution. The values of these
parameters are provided in the detail specification, when necessary.
---------------------- Page: 9 ----------------------
– 8 – 60875-1 © IEC:2010
Single-mode, non-wavelength-selective branching devices may operate in a coherent fashion
with respect to multiple inputs. Consequently, the transfer coefficients may be affected by the
relative phase and intensity of simultaneous coherent optical power inputs at two or more ports
3.1.4
transfer coefficient
element t of the transfer matrix
ij
3.1.5
logarithmic transfer matrix
in general, the logarithmic transfer matrix is as follows:
a a ⋅ ⋅ ⋅ a
⎡ ⎤
11 12 1n
⎢ ⎥
a
21
⎢ ⎥
⋅
⎢ ⎥
A =
⎢⋅ a ⎥
ij
⎢ ⎥
⋅
⎢ ⎥
a a
⎢ n1 nn⎥
⎣ ⎦
where
a is the optical power reduction in decibels out of port j with unit power into port i, that is:
ij
a = –10 log t
ij ij
where t is the transfer matrix coefficient
ij
3.1.6
conducting ports
two ports i and j between which t is nominally greater than zero
ij
3.1.7
isolated ports
two ports i and j between which t is nominally zero, and a is nominally infinite
ij ij
3.2 Component definitions
3.2.1
non-wavelength-selective branching device
passive component possessing three or more ports which operates over a specified range of
wavelengths and shares the optical power coming into an input port among its output ports in a
predetermined fashion, without any amplification, switching, or other active modulation
3.2.2
splitter
term frequently used as a synonym for a non-wavelength-selective branching device with 1 or 2
entries (input ports) and more then 4 exits (output ports) designed and intended to produce
equal optical power at the output ports
3.2.3
coupler
term frequently used as a synonym for a non-wavelength-selective branching device with 1 or 2
entries (input ports) and 4 or less exits (output ports) or with M entries (input ports) and up to N
exits (output ports) where the number of exits (output ports) is larger then one (N>1)
3.2.4
symmetric non-wavelength-selective branching device
device whose transfer matrix is diagonally symmetric, i.e. where for all i and j, t and t are
ij ji
nominally equal
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60875-1 © IEC:2010 – 9 –
3.2.5
asymmetric non-wavelength-selective branching device
device whose transfer matrix is diagonally asymmetric, i.e. where there exists at least one i and
j for which t and t are nominally unequal
ij ij
3.2.6
balanced coupler
term frequently used as a synonym for a symmetric non-wavelength-selective branching
device which is designed and intended to produce that each output port power from the same
input port is equal
3.2.7
unbalanced coupler
term frequently used as a synonym for a asymmetric non-wavelength-selective branching
device which is designed and intended to produce that power at each output port is different
3.2.8
tap-coupler
term frequently used as a synonym for a unbalanced coupler, typically the coupling ratio is from
1 % to 20 %
3.2.9
polarization dependent loss
PDL
maximum variation of insertion loss due to a variation of the state of polarization (SOP) over
all the SOPs
3.3 Performance parameter definitions
3.3.1
insertion loss
element, a (where i ≠ j), of the logarithmic transfer matrix; reduction in optical power between
ij
an input and output port of a passive component expressed in decibels and defined as
a = –10 log (P /P )
1 0
where
P is the optical power launched into the input port;
0
P is the optical power received from the output port
1
3.3.2
return loss
element, a (where i = j), of the logarithmic transfer matrix; fraction of input power that is
ij
returned from the input port of a passive component and defined as
RL = –10 log (P /P )
1 0
where
P is the optical power launched into the input port;
0
P is the optical power received back from the same port
1
3.3.3
directivity
value of a between two isolated ports
ij
---------------------- Page: 11 ----------------------
– 10 – 60875-1 © IEC:2010
3.3.4
excess loss
total power lost in a non-wavelength-selective branching device when an optical signal is
launched into port i, defined as
EL = −10 log t
i ∑ ij
j
where the summation is performed only over those values j for which i and j are conducting
ports. For a non-wavelength-selective branching device with N input ports, there is an array of
N values of excess loss, one for each input port i
3.3.5
uniformity
logarithmic transfer matrix of a branching device may contain a specified set of coefficients
which are nominally finite and equal. In this case, the range of these coefficients a , expressed
ij
in decibels, is termed the uniformity of the branching device
3.3.6
coupling ratio
for a given input port i, the ratio of light at a given output port k to the total light from all output
ports and defined as
CR = t t
ik ik ij
∑
j
where j represents the operational output ports
3.3.7
operating wavelength
nominal wavelength λ, at which a passive component is designed to operate with the specified
performance
3.3.8
operating wavelength range
specified range of wavelengths from λ to λ about a nominal operating wavelength λ ,
i min i max i
within which a passive component is designed to operate with the specified performance
NOTE For a non-wavelength-selective branching device with more than one operating wavelength, the
corresponding wavelength ranges are not necessarily equal.
4 Requirements
4.1 Classification
4.1.1 General
Non-wavelength-selective branching devices shall be classified as follows:
– type;
– style;
– variant;
– performance standard grad;
– assessment level;
– normative reference extensions.
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60875-1 © IEC:2010 – 11 –
4.1.2 Types
The main characteristics of each type are as follows:
– transmissive or reflective;
– bidirectional or unidirectional;
– tree or star;
– any combination of the above.
4.1.3 Style
4.1.3.1 General
Non-wavelength-selective branching devices may be classified into styles based on the fibre
type(s), the connector type(s), cable type(s), housing shape, and the configuration. The
configuration of branching device ports are classified as follows:
4.1.3.2 Configuration A
Device containing integral fibre optic pigtails, without connectors.
EXAMPLE
IEC 665/10
Figure 1 – Non-wavelength-selective branching device
4.1.3.3 Configuration B
Device containing integral fibre optic pigtails, with a connector on each pigtail.
EXAMPLE
IEC 666/10
Figure 2 – Non-wavelength-selective branching device
4.1.3.4 Configuration C
Device containing fibre optic connectors as an integral part of the device housing.
---------------------- Page: 13 ----------------------
– 12 – 60875-1 © IEC:2010
EXAMPLE
IEC 667/10
Figure 3 – Non-wavelength-selective branching device
4.1.3.5 Configuration D
Device containing some combination of the interfacing features of the preceding configurations.
EXAMPLE
IEC 668/10
Figure 4 – Non-wavelength-selective branching device
4.1.4 Variant
The branching device 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:
– orientation of ports;
– 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 the 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 %;
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60875-1 © IEC:2010 – 13 –
– 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
...
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