SIST EN 60875-1:2010

Fibre optic interconnecting devices and passive components - Non-wavelength-selective fibre optic branching devices - Part 1: Generic specification (IEC 60875-1:2010)

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.

Lichtwellenleiter - Verbindungselemente und passive Bauteile - wellenlängenunabhängige Lichtwellenleiter-Verzweiger - Teil 1: Fachgrundspezifikation (IEC 60875-1:2010)

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 (CEI 60875-1:2010)

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.

Optični spojni elementi in pasivne komponente - Valovnodolžinsko neselektivni optični sklopniki - 1. del: Rodovna specifikacija (IEC 60875-1:2010)

Ta del IEC 60875 velja za valovnodolžinsko neselektivne optične sklopnike z naslednjimi lastnostmi:
– so pasivni, saj ne vsebujejo nobenih optoelektronskih ali drugih pretvorniških elementov;
- imajo tri ali več priključnih odprtin za vstop in/ali izstop optične moči; optična moč se deli med te priključne odprtine na vnaprej določen način;
- te priključne odprtine so optična vlakna ali konektorji optičnih vlaken.
Ta standard vzpostavlja enotne zahteve za optične, mehanične in okoljske
lastnosti.

General Information

• Status: Withdrawn
• Publication Date: 22-Jul-2010
• Withdrawal Date: 21-Jun-2016
• ICS: 33.180.20 - Fibre optic interconnecting devices
• Technical Committee: MOC - Mobile Communications
• Current Stage: 9900 - Withdrawal (Adopted Project)
• Start Date: 22-Jun-2016
• Due Date: 15-Jul-2016
• Completion Date: 22-Jun-2016
• Ref Project: EN 60875-1:2010 - Fibre optic interconnecting devices and passive components - Non-wavelength-selective fibre optic branching devices - Part 1: Generic specification

Relations

• Replaced By: SIST EN 60875-1:2015 - Fibre optic interconnecting devices and passive components - Non-wavelength-selective fibre optic branching devices - Part 1: Generic specification (IEC 60875-1:2015)
• Effective Date: 07-Jul-2015
• Replaced By: SIST EN 60875-1:2015 - Fibre optic interconnecting devices and passive components - Non-wavelength-selective fibre optic branching devices - Part 1: Generic specification (IEC 60875-1:2015)
• Effective Date: 07-Jun-2022
• Revised: SIST EN 60875-1:2002 - Non-wavelength-selective fibre optic branching devices -- Part 1: Generic specification
• Effective Date: 05-Jul-2011
• Replaces: SIST EN 60875-1:2002 - Non-wavelength-selective fibre optic branching devices -- Part 1: Generic specification
• Effective Date: 28-Jan-2023
• Replaces: SIST EN 60875-1:2002 - Non-wavelength-selective fibre optic branching devices -- Part 1: Generic specification
• Effective Date: 07-Jun-2022

Standards Content (Sample)

SLOVENSKI STANDARD
SIST EN 60875-1:2010
01-september-2010
1DGRPHãþD
SIST EN 60875-1:2002
2SWLþQLVSRMQLHOHPHQWLLQSDVLYQHNRPSRQHQWH9DORYQRGROåLQVNRQHVHOHNWLYQL
RSWLþQLVNORSQLNLGHO5RGRYQDVSHFLILNDFLMD,(&
Fibre optic interconnecting devices and passive components - Non-wavelength-selective
fibre optic branching devices - Part 1: Generic specification (IEC 60875-1:2010)
Lichtwellenleiter - Verbindungselemente und passive Bauteile -
wellenlängenunabhängige Lichtwellenleiter-Verzweiger - Teil 1: Fachgrundspezifikation
(IEC 60875-1:2010)
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 (CEI 60875-1:2010)
Ta slovenski standard je istoveten z: EN 60875-1:2010
ICS:
33.180.20 3RYH]RYDOQHQDSUDYH]D Fibre optic interconnecting
RSWLþQDYODNQD devices
SIST EN 60875-1:2010 en
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

---------------------- Page: 1 ----------------------

SIST EN 60875-1:2010

---------------------- Page: 2 ----------------------

SIST EN 60875-1:2010

EUROPEAN STANDARD
EN 60875-1

NORME EUROPÉENNE
July 2010
EUROPÄISCHE NORM

ICS 33.180.20 Supersedes EN 60875-1:2001


English version


Fibre optic interconnecting devices and passive components -
Non-wavelength-selective fibre optic branching devices -
Part 1: Generic specification
(IEC 60875-1:2010)


Dispositifs d’interconnexion  Lichtwellenleiter - Verbindungselemente
et composants passifs à fibres optiques - und passive Bauteile -
Dispositifs de couplage pour fibres wellenlängenunabhängige
optiques ne dépendant pas de la longueur Lichtwellenleiter-Verzweiger -
d’onde - Teil 1: Fachgrundspezifikation
Partie 1: Spécification générique (IEC 60875-1:2010)
(CEI 60875-1:2010)




This European Standard was approved by CENELEC on 2010-07-01. 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, Bulgaria, Croatia, Cyprus,
the Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy,
Latvia, Lithuania, Luxembourg, Malta, the Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia,
Spain, Sweden, Switzerland and the United Kingdom.

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

Management Centre: Avenue Marnix 17, B - 1000 Brussels


© 2010 CENELEC - All rights of exploitation in any form and by any means reserved worldwide for CENELEC members.
Ref. No. EN 60875-1:2010 E

---------------------- Page: 3 ----------------------

SIST EN 60875-1:2010
EN 60875-1:2010 - 2 -
Foreword
The text of document 86B/2986/FDIS, future edition 5 of IEC 60875-1, prepared by SC 86B, Fibre optic
interconnecting devices and passive components, of IEC TC 86, Fibre optics, was submitted to the
IEC-CENELEC parallel vote and was approved by CENELEC as EN 60875-1 on 2010-07-01.
This European Standard supersedes EN 60875-1:2001.
This EN 60875-1:2010 constitutes a technical revision. The changes with respect to EN 60875-1:2001 are
to delete the clause of Quality assessment procedures and reconsider the constitution of this standard.
Attention is drawn to the possibility that some of the elements of this document may be the subject of
patent rights. CEN and CENELEC shall not be held responsible for identifying any or all such patent
rights.
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) 2011-04-01
– latest date by which the national standards conflicting
with the EN have to be withdrawn (dow) 2011-07-01
Annex ZA has been added by CENELEC.
__________
Endorsement notice
The text of the International Standard IEC 60875-1:2010 was approved by CENELEC as a European
Standard without any modification.
In the official version, for Bibliography, the following notes have to be added for the standards indicated:
IEC 60068 series NOTE  Harmonized in EN 60068 series (not modified).
IEC 60874 series NOTE  Harmonized in EN 60874 series (not modified).
IEC 60869-1 NOTE  Harmonized as EN 60869-1.
IEC 60974 series NOTE  Harmonized in EN 60974 series (partially modified).
IEC 61300-1 NOTE  Harmonized as EN 61300-1.
IEC 61300-2 series NOTE  Harmonized in EN 61300-2 series (not modified).
IEC 61300-3 series NOTE  Harmonized in EN 61300-3 series (not modified).
IEC 61753 NOTE  Harmonized as EN 61753.
IEC 61754-4 NOTE  Harmonized as EN 61754-4.
IEC 61754-13 NOTE  Harmonized as EN 61754-13.
IEC 61754-15 NOTE  Harmonized as EN 61754-15.
IEC 62005 series NOTE  Harmonized in EN 62005 series (not modified).
__________

---------------------- Page: 4 ----------------------

SIST EN 60875-1:2010
- 3 - EN 60875-1:2010
Annex ZA
(normative)

Normative references to international publications
with their corresponding European publications

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.

NOTE  When an international publication has been modified by common modifications, indicated by (mod), the relevant EN/HD
applies.

Publication Year Title EN/HD Year


IEC 60027 Series Letter symbols to be used in electrical EN 60027 Series
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 - EN 60695-11-5 -
Part 11-5: Test flames - Needle-flame test
method - Apparatus, confirmatory test
arrangement and guidance


IEC 60825 Series Safety of laser products EN 60825 Series


IEC 61300 Series Fibre optic interconnecting devices and EN 61300 Series
passive components - Basic test and
measurement procedures


IEC/TR 61930 - Fibre optic graphical 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) - Basic
Rules


IECQ 001002-3 - IEC Quality Assessment System - -
for Electronic Components (IECQ) - Rules of
Procedure - Part 3: Approval procedures


ISO 129-1 - Technical drawings - Indication of dimensions - -
and tolerances -
Part 1: General principles


ISO 286-1 - ISO system of limits and fits - EN ISO 286-1 -
Part 1: Bases of tolerances, deviations
and fits


ISO 1101 - Geometrical Product Specifications (GPS) - EN ISO 1101 -
Geometrical tolerancing - Tolerances of form,
orientation, location and run-out


ISO 8601 - Data elements and interchange formats - - -
Information interchange - Representation of
dates and times

---------------------- Page: 5 ----------------------

SIST EN 60875-1:2010

---------------------- Page: 6 ----------------------

SIST EN 60875-1:2010

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: 7 ----------------------

SIST EN 60875-1:2010
– 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

---------------------- Page: 8 ----------------------

SIST EN 60875-1:2010
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

---------------------- Page: 9 ----------------------

SIST EN 60875-1:2010
– 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
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.

---------------------- Page: 10 ----------------------

SIST EN 60875-1:2010
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.

---------------------- Page: 11 ----------------------

SIST EN 60875-1:2010
– 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

---------------------- Page: 12 ----------------------

SIST EN 60875-1:2010
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.

---------------------- Page: 13 ----------------------

SIST EN 60875-1:2010
– 8 – 60875-1 © IEC:2010(E)
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

---------------------- Page: 14 ----------------------

SIST EN 60875-1:2010
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

---------------------- Page: 15 ----------------------

SIST EN 60875-1:2010
– 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.

---------------------- Page: 16 --------------
...