IEC 61755-2-5:2015

IEC 61755-2-5 ®
Edition 1.0 2015-01
INTERNATIONAL
STANDARD
colour
inside
Fibre optic interconnecting devices and passive components – Connector
optical interfaces –
Part 2-5: Connection parameters of non-dispersion shifted single-mode
physically contacting fibres – Angled for reference connection applications

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 Tel.: +41 22 919 02 11
3, rue de Varembé Fax: +41 22 919 03 00
CH-1211 Geneva 20 info@iec.ch
Switzerland 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.

IEC Catalogue - webstore.iec.ch/catalogue Electropedia - www.electropedia.org
The stand-alone application for consulting the entire The world's leading online dictionary of electronic and
bibliographical information on IEC International Standards, electrical terms containing more than 30 000 terms and
Technical Specifications, Technical Reports and other definitions in English and French, with equivalent terms in 15
documents. Available for PC, Mac OS, Android Tablets and additional languages. Also known as the International
iPad. Electrotechnical Vocabulary (IEV) online.

IEC publications search - www.iec.ch/searchpub IEC Glossary - std.iec.ch/glossary
The advanced search enables to find IEC publications by a More than 60 000 electrotechnical terminology entries in
variety of criteria (reference number, text, technical English and French extracted from the Terms and Definitions
committee,…). It also gives information on projects, replaced clause of IEC publications issued since 2002. Some entries
and withdrawn publications. have been collected from earlier publications of IEC TC 37,

77, 86 and CISPR.
IEC Just Published - webstore.iec.ch/justpublished

Stay up to date on all new IEC publications. Just Published IEC Customer Service Centre - webstore.iec.ch/csc
details all new publications released. Available online and If you wish to give us your feedback on this publication or
also once a month by email. need further assistance, please contact the Customer Service
Centre: csc@iec.ch.
IEC 61755-2-5 ®
Edition 1.0 2015-01
INTERNATIONAL
STANDARD
colour
inside
Fibre optic interconnecting devices and passive components – Connector

optical interfaces –
Part 2-5: Connection parameters of non-dispersion shifted single-mode

physically contacting fibres – Angled for reference connection applications

INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
ICS 33.180.20 ISBN 978-2-8322-2194-5

– 2 – IEC 61755-2-5:2015 © IEC 2015
CONTENTS
FOREWORD . 3
1 Scope . 5
2 Normative references . 5
3 Performance grades . 6
4 Description . 6
5 Criteria for a fit within performance grades . 7
5.1 General . 7
5.2 Attenuation grades and criteria . 7
6 Use of selected fibre to assemble reference connector plugs . 9
7 Reference adaptor . 9
8 Attenuation measurement uncertainty contribution . 9
Annex A (informative) Example of determination of the attenuation measurement
uncertainty . 10

Figure 1 – Representation of fibre core position of single connector plug under the
assumption of worst case alignment with identical connector plug. 8
Figure A.1 – Attenuation measurement uncertainty contribution for Grade 1 reference
connectors . 10

Table 1 – Single-mode attenuation grades at 1 310 nm (dB) . 6
Table 2 – Mode field diameter and fibre core nominal index of refraction for fibre to be
used in reference connector plugs . 7
Table 3 – Measurement uncertainty contribution of reference connectors . 9

INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
FIBRE OPTIC INTERCONNECTING
DEVICES AND PASSIVE COMPONENTS –
CONNECTOR OPTICAL INTERFACES –

Part 2-5: Connection parameters of non-dispersion
shifted single-mode physically contacting fibres –
Angled for reference connection applications

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 61755-2-5 has been prepared by subcommittee 86B: Fibre optic
interconnecting devices and passive components, of IEC technical committee 86: Fibre optics.
The text of this standard is based on the following documents:
FDIS Report on voting
86B/3846/FDIS 86B/3867/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.

– 4 – IEC 61755-2-5:2015 © IEC 2015
This publication has been drafted in accordance with the ISO/IEC Directives, Part 2.
A list of all parts in the IEC 61755 series, published under the general title Fibre optic
interconnecting devices and passive components – Connector optical interfaces, can be found
on the IEC website.
Future standards in this series will carry the new general title as cited above. Titles of existing
standards in this series will be updated at the time of the next edition.
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.
FIBRE OPTIC INTERCONNECTING
DEVICES AND PASSIVE COMPONENTS –
CONNECTOR OPTICAL INTERFACES –

Part 2-5: Connection parameters of non-dispersion
shifted single-mode physically contacting fibres –
Angled for reference connection applications

1 Scope
This part of IEC 61755 defines a set of prescribed conditions that should be maintained in
order to satisfy the requirements of angled polished reference connections.
The prescribed conditions include dimensional limits and optical fibre requirements of the
optical interface to meet specific requirements for reference connection (plugs and adaptors)
used for attenuation measurements.
Two different grades for reference connections are defined in this standard. The use of each
of these grades depends on the application and on the targeted attenuation measurement
uncertainty. The model uses a Gaussian distribution of light intensity over the specified
restricted mode field diameter (MFD) range.
This standard is intended to be used for shipping and acceptance inspections.
The reference connector plug is specified for B1.1, B1.3 and B6 fibres as specified in
IEC 60793-2-50.
The use of the reference connector plug would not be recommended where classification of
fibre is difficult, for example construction and maintenance of cable plant.
2 Normative references
The following documents, in whole or in part, are normatively referenced in this document and
are indispensable for its application. For dated references, only the edition cited applies. For
undated references, the latest edition of the referenced document (including any
amendments) applies.
IEC 60793-2-50, Optical fibres – Part 2-50: Product specifications – Sectional specification for
class B single-mode fibres
IEC 61300-3-4, Fibre optic interconnecting devices and passive components – Basic test and
measurement procedures – Part 3-4: Examinations and measurements – Attenuation
IEC 61300-3-42, Fibre optic interconnecting devices and passive components – Basic test
and measurement procedures – Part 3-42: Examinations and measurements – Attenuation of
single mode alignment sleeves and or adaptors with resilient alignment sleeves
IEC 61755-2-1, Fibre optic interconnecting devices and passive components –Connector
optical interfaces – Part 2-1: Connection parameters of non-dispersion shifted single-mode
physically contacting fibres – Non-angled

– 6 – IEC 61755-2-5:2015 © IEC 2015
IEC 61755-2-2, Fibre optic interconnecting devices and passive components –Connector
optical interfaces – Part 2-2: Connection parameters of non-dispersion shifted single-mode
physically contacting fibres – Angled
IEC 61755-3 (all parts), Fibre optic interconnecting devices and passive components –
Connector optical interfaces – Part 3-x: Connector parameters of non-dispersion shifted
single-mode physically contacting fibres
IEC TR 62627-04, Fibre optic interconnecting devices and passive components – Technical
report – Part 04: Example of uncertainty calculation: Measurem
...