SIST EN 62074-1:2010

Fibre optic interconnecting devices and passive components - Fibre optic WDM devices - Part 1: Generic specification (IEC 62074-1:2009)

This part of IEC 62074 applies to fibre optic wavelength division multiplexing (WDM) devices. These have all of the following general features: - They are passive, in that they contain no optoelectronic or other transducing elements; but they may use temperature control only the purpose to stabilize the characteristics of devices; they exclude any optical switching function. - 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 depending on the wavelength. - 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 - Lichtwellenleiter-WDM-Bauteile -- Teil 1: Fachgrundspezifikation (IEC 62074-1:2009)

Dispositifs d'interconnexion et dispositifs passifs à fibres optiques - Dispositifs WDM à fibres optiques - Partie 1: Spécification générique (CEI 62074-1:2009)

Optični spojni elementi in pasivne komponente - Optični elementi za WDM (valovni multipleks) - 1. del: Rodovna specifikacija (IEC 62074-1:2009)

Ta del IEC 62074 velja za multipleksne delitve valovnih dolžin naprav (WDM naprave), ki uporabljajo optična vlakna.  Le-te imajo vse od naslednjih splošnih značilnosti: - So pasivne, saj ne vsebujejo nobenih optoelektronskih ali drugih pretvorniških elementov; lahko pa uporabljajo nadzor temperature samo z namenom stabiliziranja značilnosti naprav; nimajo nikakršne funkcije optičnega preklopa. - 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, v odvisnosti od valovne dolžine. - 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• Status: Withdrawn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: 14-Dec-2009
• Withdrawal Date: 12-Oct-2021
• ICS: 33.180.20 - Fibre optic interconnecting devices
• Technical Committee: MOC - Mobile Communications
• Current Stage: 9900 - Withdrawal (Adopted Project)
• Start Date: 12-Oct-2021
• Due Date: 04-Nov-2021
• Completion Date: 13-Oct-2021
• Ref Project: EN 62074-1:2009 - Fibre optic interconnecting devices and passive components - Fibre optic WDM devices - Part 1: Generic specification

Relations

• Revised: SIST EN 62074-1:2014 - Fibre optic interconnecting devices and passive components - Fibre optic WDM devices - Part 1: Generic specification
• Effective Date: 06-May-2014
• Replaced By: SIST EN 62074-1:2014 - Fibre optic interconnecting devices and passive components - Fibre optic WDM devices - Part 1: Generic specification
• Effective Date: 28-Jan-2023
• Replaced By: SIST EN 62074-1:2014 - Fibre optic interconnecting devices and passive components - Fibre optic WDM devices - Part 1: Generic specification
• Effective Date: 21-Sep-2012

Standards Content (Sample)

SLOVENSKI STANDARD
SIST EN 62074-1:2010
01-januar-2010
2SWLþQLVSRMQLHOHPHQWLLQSDVLYQHNRPSRQHQWH2SWLþQLHOHPHQWL]D:'0YDORYQL
PXOWLSOHNVGHO5RGRYQDVSHFLILNDFLMD,(&
Fibre optic interconnecting devices and passive components - Fibre optic WDM devices
- Part 1: Generic specification (IEC 62074-1:2009)
Lichtwellenleiter - Verbindungselemente und passive Bauteile - Lichtwellenleiter-WDM-
Bauteile -- Teil 1: Fachgrundspezifikation (IEC 62074-1:2009)
Dispositifs d'interconnexion et dispositifs passifs à fibres optiques - Dispositifs WDM à
fibres optiques - Partie 1: Spécification générique (CEI 62074-1:2009)
Ta slovenski standard je istoveten z: EN 62074-1:2009
ICS:
33.180.20 3RYH]RYDOQHQDSUDYH]D Fibre optic interconnecting
RSWLþQDYODNQD devices
SIST EN 62074-1:2010 en
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

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SIST EN 62074-1:2010

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SIST EN 62074-1:2010

EUROPEAN STANDARD
EN 62074-1

NORME EUROPÉENNE
November 2009
EUROPÄISCHE NORM

ICS 33.180.01; 33.180.20


English version


Fibre optic interconnecting devices and passive components -
Fibre optic WDM devices -
Part 1: Generic specification
(IEC 62074-1:2009)


Dispositifs d'interconnexion  Lichtwellenleiter -
et dispositifs passifs à fibres optiques - Verbindungselemente
Dispositifs WDM à fibres optiques - und passive Bauteile -
Partie 1: Spécification générique Lichtwellenleiter-WDM-Bauteile -
(CEI 62074-1:2009) Teil 1: Fachgrundspezifikation
(IEC 62074-1:2009)




This European Standard was approved by CENELEC on 2009-10-01. 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, 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

Central Secretariat: Avenue Marnix 17, B - 1000 Brussels


© 2009 CENELEC - All rights of exploitation in any form and by any means reserved worldwide for CENELEC members.
Ref. No. EN 62074-1:2009 E

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SIST EN 62074-1:2010
EN 62074-1:2009 - 2 -
Foreword
The text of document 86B/2850/FDIS, future edition 1 of IEC 62074-1, 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 62074-1 on 2009-10-01.
The following dates were fixed:
– latest date by which the EN has to be implemented
at national level by publication of an identical
national standard or by endorsement (dop) 2010-07-01
– latest date by which the national standards conflicting
with the EN have to be withdrawn (dow) 2012-10-01
Annex ZA has been added by CENELEC.
__________
Endorsement notice
The text of the International Standard IEC 62074-1:2009 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 61300-1 NOTE  Harmonized as EN 61300-1:2003 (not modified).
IEC 61300-2 NOTE  Harmonized in EN 61300-2 series (not modified).
IEC 61300-3 NOTE  Harmonized in EN 61300-3 series (not modified).
__________

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SIST EN 62074-1:2010
- 3 - EN 62074-1:2009
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


1)
IEC 60050-731 - International Electrotechnical Vocabulary - -
(IEV) -
Chapter 731: Optical fibre communication


IEC 60617 Data- Graphical symbols for diagrams - -
base


1) 2)
IEC 60695-11-5 - Fire hazard testing - EN 60695-11-5 2005
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


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


1) 2)
ISO 286-1 - ISO system of limits and fits - EN 20286-1 1993
Part 1: Bases of tolerances, deviations and fits


1)
ISO 370 - Toleranced dimensions - Conversion from - -
inches into millimetres and vice versa


1) 2)
ISO 1101 - Geometrical Product Specifications (GPS) - EN ISO 1101 2005
Geometrical tolerancing - Tolerances of form,
orientation, location and run-out


1)
ISO 8601 - Data elements and interchange formats - - -
Information interchange - Representation of
dates and times


ITU-T 2005 Transmission characteristics of optical - -
Recommendation components and subsystems
G.671


ITU-T 1998 Optical interfaces for multichannel systems - -
Recommendation with optical amplifiers
G.692




1)
Undated reference.
2)
Valid edition at date of issue.

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SIST EN 62074-1:2010

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SIST EN 62074-1:2010
IEC 62074-1
®
Edition 1.0 2009-07
INTERNATIONAL
STANDARD


Fibre optic interconnecting devices and passive components – Fibre optic WDM
devices –
Part 1: Generic specification


INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
PRICE CODE
W
ICS 33.180.01; 33.180.20 ISBN 2-8318-1051-5
® Registered trademark of the International Electrotechnical Commission

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SIST EN 62074-1:2010
– 2 – 62074-1 © IEC:2009(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 .22
4.1 Classification.22
4.1.1 General .22
4.1.2 Type .22
4.1.3 Style .22
4.1.4 Variant.23
4.1.5 Assessment level.23
4.1.6 Normative reference extension.24
4.2 Documentation .24
4.2.1 Symbols.24
4.2.2 Specification system .24
4.2.3 Drawings .25
4.2.4 Measurements .25
4.2.5 Test data sheets .26
4.2.6 Instructions for use .26
4.3 Standardization system.26
4.3.1 Performance standards.26
4.3.2 Reliability standard .26
4.3.3 Interlinking.27
4.4 Design and construction .28
4.4.1 Materials.28
4.4.2 Workmanship .28
4.5 Performance requirements.28
4.6 Identification and marking.28
4.6.1 General .28
4.6.2 Variant identification number.28
4.6.3 Component marking.28
4.6.4 Package marking .29
4.7 Safety.29
Annex A (informative) Transfer matrix .30
Annex B (informative) Examples of fibre optic WDM device types .33
Bibliography .38

Figure 1 – Example of a six-port device, with two-input and four-output ports.8
Figure 2 – Illustration of adjacent channel isolation.10
Figure 3 – Illustration of a four-wavelength bidirectional system .11
Figure 4 – Illustration of channel insertion loss variation .12
Figure 5 – Illustration of free spectral range.13

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SIST EN 62074-1:2010
62074-1 © IEC:2009(E) – 3 –
Figure 6 – Illustration of insertion loss .14
Figure 7 – Illustration of minimum and maximum insertion loss.14
Figure 8 – Illustration of isolation wavelength.15
Figure 9 – Illustration of isolation wavelength range.15
Figure 10 – Illustration of maximum adjacent channel isolation .16
Figure 11 – Illustration of non-adjacent channel isolation .17
Figure 12 – Illustration of operating wavelength .17
Figure 13 – Illustration of operating wavelength range .18
Figure 14– Illustration of polarisation dependent centre wavelength (PDCW) .19
Figure 15 – Illustration of ripple (a) at the band edges and (b) in-band. .20
Figure 16 – Illustration of X-dB bandwidth.21
Figure 17 – Wavelength-selective branching device.22
Figure 18 – Wavelength-selective branching device.23
Figure 19 – Wavelength-selective branching device.23
Figure 20 – Wavelength-selective branching device.23
Figure A.1 – Example of a six-port device, with two-input and four-output ports.30
Figure A.2 – Illustration of transfer matrix coefficient .31
Figure B.1 – Example of a wavelength multiplexer .33
Figure B.2 – Example of a wavelength demultiplexer .34
Figure B.3 – Example of a wavelength multiplexer/demultiplexer.34
Figure B.4 – Example of a wavelength router.35
Figure B.5 – Example of wavelength channel add/drop .36

Table 1 – Three-level IEC specification structure .24
Table 2 – Standards interlink matrix .27

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SIST EN 62074-1:2010
– 4 – 62074-1 © IEC:2009(E)
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________

FIBRE OPTIC INTERCONNECTING
DEVICES AND PASSIVE COMPONENTS –
FIBRE OPTIC WDM 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 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 62074-1 has been prepared by subcommittee SC86B: Fibre optic
interconnecting devices and passive components, of IEC technical committee 86: Fibre optics.
This standard cancels and replaces IEC/PAS 62074-1 published in 2007. This first edition
constitutes a technical revision.
The text of this standard is based on the following documents:
FDIS Report on voting
86B/2850/FDIS 86B/2889/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.

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SIST EN 62074-1:2010
62074-1 © IEC:2009(E) – 5 –
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.
A bilingual version of this publication may be issued at a later date.

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SIST EN 62074-1:2010
– 6 – 62074-1 © IEC:2009(E)
FIBRE OPTIC INTERCONNECTING
DEVICES AND PASSIVE COMPONENTS –
FIBRE OPTIC WDM DEVICES –

Part 1: Generic specification



1 Scope
This part of IEC 62074 applies to fibre optic wavelength division multiplexing (WDM) devices.
These have all of the following general features:
• They are passive, in that they contain no optoelectronic or other transducing elements; but
they may use temperature control only the purpose to stabilize the characteristics of
devices; they exclude any optical switching function.
• 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 depending on the wavelength.
• 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, International Standard Database Snapshot – 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
ISO 129-1, Technical drawings – Indication of dimensions amd tolerances – General principles
ISO 286-1, ISO system of limits and fits – Part 1: Bases of tolerances, deviations and fits
ISO 370, Toleranced dimensions – Conversion from inches into millimeters and vice versa
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

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SIST EN 62074-1:2010
62074-1 © IEC:2009(E) – 7 –
ITU-T Recommendation G.671:2005, Transmission characteristics of optical components and
subsystems
ITU-T Recommendation G.692:1998, Optical interfaces for multichannel systems with optical
amplifiers
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 fibre connector attached to a passive component for the entry and/or exit
of the optical power (input and/or output port)
3.1.2
transfer matrix
optical properties of a fibre optic wavelength-selective branching device can be defined in
terms of an n x n matrix of coefficients, where n is the number of ports, and the coefficients
represent the fractional optical power transferred between designated ports
NOTE The detail explanation of transfer matrix is shown in Annex A.
3.1.3
transfer matrix coefficient
element t of the transfer matrix
ij
NOTE The detail explanation is shown in Annex A.
3.1.4
logarithmic transfer matrix
transfer matrix whose matrix element a is a logarithmic value of transfer matrix element t
ij ij
NOTE The detail explanation is shown in Annex A.
3.1.5
conducting ports
two ports i and j between which t is nominally greater than zero at a specified wavelength
ij
3.1.6
input/output port pair
conducting ports i and j (t nominally greater than zero) that are isolated from any other ports j
ij
(a nominally infinite). The ports are numbered sequentially, so that the transfer matrix is
ij
developed to show all ports and all possible combinations. The port numbering is arbitrary.
NOTE Figure 1 below shows an example of a six-port device, with two input ports and four output ports.

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SIST EN 62074-1:2010
– 8 – 62074-1 © IEC:2009(E)

Inputs Outputs
3
1
4
5
2
6
IEC  1188/09

Figure 1 – Example of a six-port device, with two-input and four-output ports
If there are four operating wavelengths, then the resulting transfer matrix becomes a 6×6×4
matrix: loss at λ from port 1 to port 6 would use a . Reflectance of port 2 at λ would use
1 161 4
a . Loss from port 5 to port 2 at λ would use a
224 3 523
3.1.7
isolated ports
two ports i and j between which t is nominally zero, and a is nominally infinite at a specified
ij ij
wavelength
3.1.8
channel
another term for operating wavelength (or frequency)
3.1.9
channel spacing
centre-to-centre differences in frequency or wavelength between adjacent channels in a WDM
device
3.2 Component definitions
3.2.1
wavelength-selective branching device
passive component possessing three or more ports which shares optical power among its ports
in a predetermined fashion, without any amplification, switching, or other active modulation but
only depending on the wavelength, in the sense that at least two different wavelength ranges
are nominally transferred between two different couples of ports
3.2.2
wavelength division multiplexer
WDM
term which is frequently used as a synonym for a wavelength-selective branching device
3.2.3
dense WDM device
DWDM
WDM device which is intended to operate for channel spacing equal or less than 1 000 GHz
3.2.4
coarse WDM device
CWDM
WDM device which is intended to operate for channel spacing less than 50 nm and greater
than 1 000 GHz (about 8 nm at 1 550 nm and 5,7 nm at 1 310 nm)

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SIST EN 62074-1:2010
62074-1 © IEC:2009(E) – 9 –
3.2.5
wide WDM device
WWDM
WDM device which is intended to operate for channel spacing equal or greater than 50 nm
3.2.6
wavelength multiplexer
MUX
WDM (DWDM, CWDM or WWDM) which has n input ports and one output port, and which
function is to combine n different optical signals differentiated by wavelength from n
corresponding input ports on to a single output port
3.2.7
wavelength demultiplexer
DEMUX
WDM (DWDM, CWDM or WWDM) which has one input port and n output ports, and which
function is to separate n different optical signals differentiated by wavelength from a single
input port to n corresponding output ports
3.2.8
interleaver
bidirectional DWDM which has three ports, and which function is to separate n different optical
signals differentiated by wavelength from a single input port to odd channel signal to one output
port and even channel signal to the other output port alternately
3.3 Performance parameter definitions
3.3.1
crosstalk
for WDM devices, the value of the ratio between the optical power of the specified signal and
all noises
3.3.2
isolation
for WDM devices, the value of the ratio between the optical power of the specified signal and
the specified noise
3.3.3
add-drop isolation
value of the optical power reduction in decibels a between an input i, and an output port j, that
ij
are isolated at every wavelength (or frequency for a dense WDM (DWDM) device). a is a
ij
logarithmic transfer element

3.3.4
adjacent channel isolation (adjacent channel crosstalk)
unidirectional (far-end) isolation with the restriction that x, the isolation wavelength number, is
restricted to the channels immediately adjacent to the (channel) wavelength number associated
with port o
NOTE This is illustrated in Figure 2 below. The adjacent channel crosstalk has the same meaning as adjacent
channel isolation.

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SIST EN 62074-1:2010
– 10 – 62074-1 © IEC:2009(E)
Nonadjacent Adjacent Adjacent Nonadjacent
Channel
channel channel channel channel
central
central central central central
frequency
frequency frequency or wavelength frequency frequency
or wavelength or wavelength or wavelength or wavelength
0 dB
Adjacent
a
channel ioc
isolation
a
iox
Insertion
loss (dB)
Nonadjacent channel Adjacent channel Channel frequency
Adjacent channel Nonadjacent channel
frequency range frequency range range (DWDM)
frequency range frequency range
(DWDM) or channel (DWDM) or channel or channel
(DWDM) or channel (DWDM) or channel
wavelength range wavelength range
wavelength range wavelength range
wavelength range
(CWDM and WWDM) (CWDM and WWDM)
(CWDM and WWDM) (CWDM and WWDM)
(CWDM and WWDM)
Optical frequency (THz) for DWDM or wavelength (nm) for CWDM and WWDM
IEC  1189/09

Figure 2 – Illustration of adjacent channel isolation
3.3.5
bidirectional (near-end) crosstalk attenuation
the (near-end) crosstalk attenuation for a bidirectional WDM multiplexer (MUX)/demultiplexer
(DMUX) device
BCA = a
mox
where
a is an element of the logarithmic transfer matrix;
mox
m is the MUX input port number;
o is the DMUX output port number;
x is the wavelength number associated with port m.
3.3.6
bidirectional (near-end) isolation
(near-end) isolation for a bidirectional WDM-MUX/DEMUX device. Because bidirectional
WDM-MUX/DMUX devices have both input channels and output channels at the same side of
the device, input light for one direction can appear on the output port for the other direction.
The bidirectional (near-end) isolation is defined to be:
= a – a
I
B mox doc
where
a is an element of the logarithmic transfer matrix;
mox
a is an element of the logarithmic transfer matrix;
doc
d is the DMUX input port number;
o is the DMUX output port number;
c is the (channel) wavelength number associated with port o;

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SIST EN 62074-1:2010
62074-1 © IEC:2009(E) – 11 –
m is the MUX input port number;
x is the wavelength number ass
...