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IEC TR 62000
Edition 3.0 2021-09
TECHNICAL
REPORT
colour
inside
Guidelines for combining different single‑mode fibre sub‑categories
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IEC TR 62000
Edition 3.0 2021-09
TECHNICAL
REPORT
colour
inside
Guidelines for combining different single‑mode fibre sub‑categories
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
ICS 33.180.10 ISBN 978-2-8322-1021-2
– 2 – IEC TR 62000:2021 © IEC 2021
CONTENTS
FOREWORD . 3
1 Scope . 5
2 Normative references. 6
3 Abbreviated terms . 6
4 System issues . 6
5 Optical fibre issues . 7
5.1 General . 7
5.2 Cut-off wavelength . 7
5.3 Splicing issues . 7
5.4 Combination of fibre parameters: chromatic dispersion coefficient and slope,
polarization mode dispersion (PMD) . 8
5.5 Non-linear effects . 8
6 Launch fibres, pigtails, patch-cords and jumper cables . 9
7 Attenuation . 9
8 Summary . 9
Bibliography . 11
Table 1 – Correspondence table of various single-mode fibres . 5
Table 2 – Recommended level of attention to be dedicated to each issue when
connecting fibre types . 10
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
GUIDELINES FOR COMBINING DIFFERENT SINGLE‑MODE FIBRE
SUB‑CATEGORIES
FOREWORD
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IEC TR 62000 has been prepared by subcommittee 86A: Fibres and cables, of IEC technical
committee 86: Fibre optics. It is a Technical Report.
This third edition cancels and replaces the second edition published in 2010. This edition
constitutes a technical revision.
This edition includes the following significant technical changes with respect to the previous
edition:
a) global uniformity of terminology concerning fibre classes, categories and sub-categories
throughout the document;
b) updating and aligning to the new naming convention of IEC 60793-2-50 for class B fibre
categories and sub-categories;
c) updating and aligning with IEC 60793-2-50 as per supported fibre sub-categories;
d) additional guidelines concerning combination of fibre parameters: chromatic dispersion and
slope, polarization mode dispersion;
e) additional guidelines concerning non-linear affects;
f) updating of bibliographical references.
– 4 – IEC TR 62000:2021 © IEC 2021
The text of this Technical Report is based on the following documents:
Draft Report on voting
86A/2114/DTR 86A/2129/RVDTR
Full information on the voting for its approval can be found in the report on voting indicated in
the above table.
The language used for the development of this Technical Report is English.
This document was drafted in accordance with ISO/IEC Directives, Part 2, and developed in
accordance with ISO/IEC Directives, Part 1 and ISO/IEC Directives, IEC Supplement, available
at /members_experts/refdocs. The main document types developed by IEC are
described in greater detail at /standardsdev/publications.
The committee has decided that the contents of this document will remain unchanged until the
stability date indicated on the IEC website under webstore.iec.ch in the data related to the
specific document. At this date, the document will be
• reconfirmed,
• withdrawn,
• replaced by a revised edition, or
• amended.
IMPORTANT – The "colour inside" logo on the cover page of this document 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.
GUIDELINES FOR COMBINING DIFFERENT SINGLE‑MODE FIBRE
SUB‑CATEGORIES
1 Scope
This document provides guidelines concerning single-mode fibre inter-compatibility.
A given category of single-mode fibre, for example B-655, can have different implementations
by suitably optimising several of the following parameters: mode field diameter (hence effective
area), chromatic dispersion coefficient, slope of the chromatic dispersion curve, cable cut-off
wavelength.
These guidelines indicate the items that are taken into account when planning to connect
1) different implementations of single-mode fibres of the same category, for example different
implementations of Class B single-mode fibres, and
2) single-mode fibres of different sub-categories, for example B-652.B with B-655.C.
See IEC 60793-2-50 for the attributes and definitions of single-mode fibre. The attributes and
definitions of fibres covered in this document are given in Table 1.
Table 1 – Correspondence table of various single-mode fibres
Common name Use (IEC 60793-2-50) IEC sub‑category ITU-T
Recommendation
Dispersion Optimised for use in the 1 310 nm region but B-652.B G.652.B
unshifted fibre can be used in the 1 550 nm region.
Extended band Optimised for use in the 1 310 nm region but B-652.D G.652.D
dispersion can be used in the O, E, S, C and L-band (i.e.
unshifted fibre throughout the 1 260 nm to 1 625 nm range).
Dispersion Optimised for single channel transmission in B-653.A G.653.A
shifted fibre the 1 550 nm region. Multiple channels can
only be transmitted if care is taken to avoid
non-linear effects such as four wave mixing by,
B-653.B G.653.B
for example, moderating the power levels or
appropriate spacing or placement of the
channels.
Cut-off shifted Optimised for low loss in the 1 550 nm region, B-654.A G.654.A
fibre with cut off wavelength shifted above the
B-654.B G.654.B
1 310 nm region.
B-654.C G.654.C
B-654.D G.654.D
B-654.E G.654.E
Non-zero Optimised for multiple channel transmission in B-655.C G.655.C
dispersion- the 1 530 to 1 625 nm region with a positive or
B-655.D G.655.D
shifted fibre negative, non-zero chromatic dispersion and a
cut off wavelength that can be shifted above
B-655.E G.655.E
the 1 310 nm region.
Wideband non- Optimised for multiple channel transmission in B-656 G.656
zero dispersion- the wavelength range of 1 460 nm to 1 625 nm
shifted fibre with the positive value of the chromatic
dispersion coefficient that is greater than some
non-zero value over the same wavelength
range.
– 6 – IEC TR 62000:2021 © IEC 2021
Common name Use (IEC 60793-2-50) IEC sub‑category ITU-T
Recommendation
Bending loss Bending loss insensitive single-mode fibre B-657.A1 G.657.A1
insensitive fibre suitable for use in the access networks,
including inside buildings at the end of these
B-657.A2 G.657.A2
networks.
They are suitable to be used in the O, E, S, C
B-657.B2 G.657.B2
and L-band (i.e. throughout the 1 260 nm to
1 625 nm range) and, in the case of
B‑657.A1 and B-657.A2, meet the requirements
B-657.B3 G.657.B3
of B-652.D fibres.
Subcategories B-657.B2 and B-657.B3 fibres
are intended to be used for restricted distances
(less than 1 000 m) at the end of access
networks, in particular inside buildings
or near buildings (e.g. outside building riser
cabling).
This document does not consider the connection of fibres with the same category from different
manufacturers, which is already considered by the standardisation pr
...