IEC TR 62000:2005

Single-mode fibre compatibility guidelines

This technical report provides guidelines indicating the items that should be taken into account when planning to connect a) different implementations of single-mode fibres of the same type, e.g. different implementations of type B single-mode fibres and b) single-mode fibres of different types, e.g. B1.1 with B4.

General Information

• Status: Published
• Publication Date: 20-Nov-2005
• ICS: 33.180.10 - Fibres and cables
• Technical Committee: SC 86A - Fibres and cables
• Current Stage: DELPUB - Deleted Publication
• Completion Date: 29-Nov-2010

Relations

• Revised: IEC TR 62000:2010 - Guidance for combining different single-mode fibres types
• Effective Date: 05-Sep-2023

Standards Content (Sample)

TECHNICAL IEC
REPORT TR 62000
First edition
2005-11
Single-mode fibre compatibility guidelines

Reference number
IEC/TR 62000:2005(E)
Publication numbering
As from 1 January 1997 all IEC publications are issued with a designation in the

60000 series. For example, IEC 34-1 is now referred to as IEC 60034-1.

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TECHNICAL IEC
REPORT TR 62000
First edition
2005-11
Single-mode fibre compatibility guidelines

© IEC 2005 ⎯ Copyright - all rights reserved
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– 2 – TR 62000 ¤ IEC:2005(E)
CONTENTS
FOREWORD.3

1 Scope.5

2 Acronyms .6

3 System issues .6

4 Fibre issues.6
4.1 Cut-off wavelength .6
4.2 Splicing issues .7
4.3 Combination of fibre parameters: chromatic dispersion coefficient and slope,
polarization mode dispersion (PMD). .7
4.4 Non-linear effects .7
5 Launch fibres, pigtails, patch-cords and jumper cables .8
6 Summary.8
Bibliography.9

TR 62000 ¤ IEC:2005(E) – 3 –
INTERNATIONAL ELECTROTECHNICAL COMMISSION

____________
SINGLE-MODE FIBRE COMPATIBILITY GUIDELINES

FOREWORD
1) The International Electrotechnical Commission (IEC) is a worldwide organization for standardization comprising

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The main task of IEC technical committees is to prepare International Standards. However, a
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data of a different kind from that which is normally published as an International Standard, for
example "state of the art".
IEC 62000, which is a technical report, has been prepared by subcommittee 86A: Fibres and
cables, of IEC technical committee 86: Fibre optics.
The text of this technical report is based on the following documents:
Enquiry draft Report on voting
86A/1022/DTR 86A/1026/RVC
Full information on the voting for the approval of this technical report 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.

– 4 – TR 62000 ¤ IEC:2005(E)
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.

TR 62000 ¤ IEC:2005(E) – 5 –
SINGLE-MODE FIBRE COMPATIBILITY GUIDELINES

1 Scope
This technical report provides guidelines indicating the items that should be taken into
account when planning to connect

a) different implementations of single-mode fibres of the same type, e.g. different
implementations of type B single-mode fibres, and
b) single-mode fibres of different types, e.g. B1.1 with B4.
See IEC 60793-2-50 for the attributes and definitions of single-mode fibres, summarised in
Table 1 below.
A given type of single-mode fibre, for example B4, may 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 and cable cut-
off wavelength.
Table 1 – Attributes and definitions of single-mode fibres
Common name Use (IEC 60793-2-50) IEC ITU-T
category/ Recommendation
type
Dispersion unshifted Optimised for use in the 1 310 nm region but can be B1.1 G.652 A, B
single-mode fibre used in the 1550 nm region
Cut-off shifted Optimised for low loss in the 1 550 nm region, with cut B1.2 G.654
single-mode fibre off wavelength shifted above the 1 310 nm region
Extended band Intended to extend the range of possible transmission B1.3 G.652 C, D
dispersion unshifted signals, using 1 310 nm band power budgets, to
single-mode fibre portions of the band above 1 360 nm and below
1 530 nm
Dispersion shifted Optimised for single channel transmission in the B.2 G.653
single-mode fibre 1 550 nm region. Multiple channels can only be
transmitted if care is taken to avoid the effects of four
wave mixing by, for example, moderating the power
levels or appropriate spacing or placement of the
channels
Non-zero Optimised for multiple channel transmission in the B4 G.655
dispersion-shifted 1 550 nm region with a cut off wavelength that may be
single-mode fibre shifted above the 1 310 nm region
Wideband Optimised for multiple channel transmission in the B5 G.656
non-zero dispersion- wavelength range of 1 460 nm – 1625 nm with the
shifted single-mode positive value of the chromatic dispersion coefficient
fibre that is greater than some non-zero value over the
same wavelength range.
NOTE The ITU-T recommendation references are for information. There can be slight variations in these
requirements due to the evolution of standards over time.
This technical report does not consider the connection of fibres with the same implementation
from different manufacturers, which is already considered by the standardisation procedure.

– 6 – TR 62000 ¤ IEC:2005(E)
2 Acronyms
For the purposes of this document, the following acronyms apply.

OTDR: Optical Time Domain Reflectometer

PMD: Polarisation Mode Dispersion

DWDM: Dense Wavelength Division Multiplexing

NRZ: Non-Return to Zero
RZ: Return to Zero
3 System issues
The different characteristics of B type fibres can be explicitly combined to optimise system
performance in terms of the dispersion characteristics (global dispersion coefficients, slope)
of the link. It is in fact possible to combine fibres with an opposite sign of the dispersion
coefficient in a given wavelength range to bring the total link dispersion to near-zero in that
range. The final result will however depend on the accuracy of individual fibre dispersion
measurements and the ability to match lengths.
The process of combining fibres with different dispersion coefficient characteristics can be
one of the ways to make dispersion management in a transmission line (the most common
one being the periodical insertion of dispersion compensating modules)
Combining fibres with a different effective area is also a possible way to minimise the overall
impact of non-linear effects. For instance, it is possible to place large effective area fibres in
the initial section of a link, where the propagating power is relatively large. In this case, the
large core reduces the associated non-linear effects. For link sections away from the source,
where power levels are reduced, fibres with smaller effective area may be used, to take
advantage of a possible reduction of the dispersion slope or to increase the efficiency of
Raman amplification. The relative size and placement of fibres with large effective area vs.
fibres with smaller effective area are critical issues in system design.
Splice loss considerations (see section 4.2) should also be taken into account when fibres
with different effective area or mode field diameter are combined.
4 Fibre issues
4.1 Cut-off wavelength
Different fibres have been historically developed for operation in different wavelength ranges:
they can therefore have different cut-off wavelengths. If the source wavelength is below the
cut-off wavelength, undesirable multi-modal propagation could occur.
It is however to be considered that the cut-off wavelength is reduced after cabling and
installation. The amount of the reduction depends on the refractive index profile, i.e. on the
fibre type. If fibre cut-off wavelength is specified, it can be assumed that, after cabling and
installation, the cut-off will be down shifted by several tens of nanometers (depending on the
fibre type). Cable cut-off wavelength is therefore specified in individual standards. See
IEC 60793-2-50 and IEC 60793-1-44.
These considerations should be applied when connecting different fibre types, e.g. type B4
with B1,
...