IEC 62074-1:2009
(Main)Fibre optic interconnecting devices and passive components - Fibre optic WDM devices - Part 1: Generic specification
Fibre optic interconnecting devices and passive components - Fibre optic WDM devices - Part 1: Generic specification
IEC 62074-1:2009(E) 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 are optical fibres or optical fibre connectors.
General Information
Relations
Standards Content (Sample)
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
IEC 62074-1:2009(E)
---------------------- Page: 1 ----------------------
THIS PUBLICATION IS COPYRIGHT PROTECTED
Copyright © 2009 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 IEC's member National Committee in the country of the requester.
If you have any questions about IEC copyright or have an enquiry about obtaining additional rights to this publication,
please contact the address below or your local IEC member National Committee for further information.
IEC Central Office
3, rue de Varembé
CH-1211 Geneva 20
Switzerland
Email: inmail@iec.ch
Web: www.iec.ch
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
The IEC on-line Catalogue enables you to search by a variety of criteria (reference number, text, technical committee,…).
It also gives information on projects, withdrawn and replaced publications.
ƒ IEC Just Published: www.iec.ch/online_news/justpub
Stay up to date on all new IEC publications. Just Published details twice a month all new publications released. Available
on-line and also by email.
ƒ Electropedia: www.electropedia.org
The world's leading online dictionary of electronic and electrical terms containing more than 20 000 terms and definitions
in English and French, with equivalent terms in additional languages. Also known as the International Electrotechnical
Vocabulary online.
ƒ Customer Service Centre: www.iec.ch/webstore/custserv
If you wish to give us your feedback on this publication or need further assistance, please visit the Customer Service
Centre FAQ or contact us:
Email: csc@iec.ch
Tel.: +41 22 919 02 11
Fax: +41 22 919 03 00
---------------------- Page: 2 ----------------------
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 978-2-88910-613-4
® Registered trademark of the International Electrotechnical Commission
---------------------- Page: 3 ----------------------
– 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
---------------------- Page: 4 ----------------------
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
---------------------- Page: 5 ----------------------
– 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.
---------------------- Page: 6 ----------------------
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.
---------------------- Page: 7 ----------------------
– 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
---------------------- Page: 8 ----------------------
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.
---------------------- Page: 9 ----------------------
– 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)
---------------------- Page: 10 ----------------------
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.
---------------------- Page: 11 ----------------------
– 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;
---------------------- Page: 12 ----------------------
62074-1 © IEC:2009(E) – 11 –
m is the MUX input port number;
x is the wavelength number associated with port m.
NOTE 1 In the example given below of a four-wavelength bidirectional system, wavelengths 1 and 2 travel from
left to right and wavelengths 3 and 4 from right to left (see Figure 3).
2
t P , t P , t P , t P
121 1 122 2 423 3 524 4
3
t P , t P , t P , t P
131 1 132 2 433 3 534 4
1
P , P
1 2 4
P
3
5
P
4
IEC 1190/09
Figure 3 – Illustration of a four-wavelength bidirectional system
NOTE 2 For the example given above, the bidirectional isolation of port 2 to wavelength 3 is a – a .
423 121
3.3.7
centre wavelength deviation
differences between the centre wavelength and nominal wavelength (frequency) of the
specified channel for DWDM devices. Where centre wavelength is defined as the centre of the
wavelength range which is x dB less than the peak of insertion loss for the specified channel
NOTE 0,5, 1 or 3 are generally used for x.
3.3.8
channel extinction
within the operating wavelength range, the difference (in dB) between the minimum powers of
the conducting channels (in dBm) and the maximum power of the isolated channels (in dBm)
3.3.9
channel frequency range
frequency range within which a DWDM device is required to operate with a specified
performance. For a particular nominal channel frequency, f , this frequency range is from
nomi
f = (f - Δf ) to f = (f + Δf ), where Δf is the maximum channel centre
imin nomi max imax nomi max max
frequency deviation. Nominal; channel centre frequency and maximum channel centre
frequency deviation are defined in ITU-T Rec. G.692
3.3.10
channel insertion loss
term used for WDM devices which has the same meaning as insertion loss
3.3.11
channel insertion loss deviation
maximum variation of the insertion loss over the operating wavelength range (channel
frequency range for a DWDM device or channel wavelength range for a coarse WDM (CWDM)
and a wide WDM (WWDM) device)
NOTE Channel insertion loss deviation should not to be confused with ripple defined below.
---------------------- Page: 13 ----------------------
– 12 – 62074-1 © IEC:2009(E)
Channel
central
frequency
or wavelength
Channel
insertion
variation
Insertion
loss (dB)
Loss measured
over all operating
Channel frequency
range (DWDM)
temperatures and
or channel
over device lifetime
wavelength range
(CWDM and WWDM)
Optical frequency (THz) for DWDM or wavelength (nm) for CWDM and WWDM
IEC 1191/09
Figure 4 – Illustration of channel insertion loss variation
3.3.12
channel non-uniformity
for a specified set of input ports the difference between the maximum and the minimum
insertion loss at the output
3.3.13
channel wavelength range
wavelength range within which a CWDM or WWDM device is required to operate a specified
performance. For a particular nominal channel centre wavelength, λ , this wavelength range
nom
from λ = (λ - Δλ ) to λ = (λ + Δλ ), where Δλ is the maximum channel
imin nom max imax nom max max
wavelength deviation
3.3.14
chromatic dispersion
group delay difference between two closely spaced wavelengths (or frequencies) inside an
optical signal going through a pair of conducting ports of a WDM device. It corresponds to the
difference between the arrival times of these two closely spaced wavelengths (or frequencies).
Chromatic dispersion is defined as the variation (first order derivative) of this group delay over
a range of wavelengths (or frequencies) especially over the channel operating wavelength (or
frequency) range at a given time, temperature, pressure and humidity. It is expressed as D in
terms of units of ps/nm or ps/GHz and it is a predictor of the broadening of a pulse transmitted
through the device
3.3.15
slope of chromatic dispersion
2 2
slope of chromatic dispersion S (with units of ps/nm or ps/GHz ) corresponds to the variation
(first order derivative) of D as a function of wavelength (or frequency) (or second order
derivative of the group delay) over the operating wavelength (or frequency) range, channel per
channel. It is particularly critical in the context of large channel counts (DWDM) or over a wide
wavelength range (CWDM or WWDM)
---------------------- Page: 14 ----------------------
62074-1 © IEC:2009(E) – 13 –
3.3.16
directivity
value of a between two isolated ports which are isolated at every wavelength (or frequency for
ij
a DWDM device)
NOTE For the example of 6 ports WDM devices show
...
Questions, Comments and Discussion
Ask us and Technical Secretary will try to provide an answer. You can facilitate discussion about the standard in here.