EN IEC 61755-2-2:2022

Fibre optic interconnecting devices and passive components - Connector optical interfaces for single-mode fibres - Part 2-2: Connection parameters of dispersion unshifted physically contacting fibres - Angled

IEC 61755-2-2:2022 defines a set of prescribed conditions for a single-mode fibre optic connection that is maintained in order to satisfy the requirements of attenuation and return loss (RL) performance in a randomly mated pair of angled polished physically contacting (APC) fibres. The model uses a Gaussian distribution of light intensity over the specified mode field diameter (MFD) for determination of attenuation performance grades, based on MFD mismatch and the amount of lateral and angular fibre core offsets. Attenuation and RL performance grades are defined in IEC 61755-1. This second edition cancels and replaces the first edition published in 2006. This edition constitutes a technical revision. This edition includes the following significant technical changes with respect to the previous edition: - addition of normative references and visual requirements; - reconsideration of the whole parts of the text to avoid misuse of the standard.

Lichtwellenleiter - Verbindungselemente und passive Bauteile - Optische Schnittstellen für Lichtwellenleiter-Steckverbinder für Einmodenfasern - Teil 2-2: Verbindungsparameter von nicht-dispersionsverschobenen Fasern mit physikalischem Kontakt - angeschrägt

Dispositifs d'interconnexion et composants passifs fibroniques - Interfaces optiques des connecteurs pour fibres unimodales - Partie 2-2: Paramètres de connexion des fibres en contact physique à dispersion non décalée - avec angle

L'IEC 61755-2-2:2022 définit un ensemble de conditions prescrites pour maintenir une connexion optique de fibres unimodales permettant de satisfaire aux exigences de performance d’affaiblissement et d’affaiblissement de réflexion (RL) dans une paire de fibres polies en contact physique avec angle (APC), accouplées sans choix préalable. Le modèle utilise une distribution gaussienne de l’intensité lumineuse sur le diamètre de champ de mode (MFD, Mode Field Diameter) spécifié, afin de déterminer les classes de performance d’affaiblissement sur la base de la discordance MFD et de la quantité de décalages latéraux et angulaires des cœurs de fibre. Les classes de performance d’affaiblissement et de RL sont définies dans l’IEC 61755-1. Cette deuxième édition annule et remplace la première édition parue en 2006. Cette édition constitue une révision technique. Cette édition inclut les modifications techniques majeures suivantes par rapport à l’édition précédente: a) ajout de références normatives et d’exigences visuelles; b) réexamen de l’ensemble des parties du texte pour prévenir toute mauvaise utilisation de la norme.

Optični spojni elementi in pasivne komponente - Vmesniki optičnih konektorjev za enorodovna vlakna - 2-2. del: Parametri konektorjev za disperzijsko nespremenjena, fizično staknjena optična vlakna - Poševno (IEC 61755-2-2:2022)

General Information

• Status: Published
• Publication Date: 20-Oct-2022
• ICS: 33.180.20 - Fibre optic interconnecting devices
• Technical Committee: CLC/TC 86BXA - Fibre optic interconnect, passive and connectorised components
• Drafting Committee: IEC/SC 86B - IEC_SC_86B
• Current Stage: 6060 - Document made available - Publishing
• Start Date: 21-Oct-2022
• Completion Date: 21-Oct-2022
• Ref Project: SIST EN IEC 61755-2-2:2022 - Fibre optic interconnecting devices and passive components - Connector optical interfaces for single-mode fibres - Part 2-2: Connection parameters of dispersion unshifted physically contacting fibres - Angled (IEC 61755-2-2:2022)

Relations

• Replaces: EN 61755-2-2:2006 - Fibre optic connector optical interfaces - Part 2-2: Optical interface standard single mode angled physically contacting fibres
• Effective Date: 25-Oct-2022

Overview

EN IEC 61755-2-2:2022 (CLC adoption of IEC 61755-2-2:2022) specifies connection parameters for angled polished physically contacting (APC) single‑mode fibre connections. It defines prescribed conditions and a modelling approach to ensure consistent attenuation and return loss (RL) performance for randomly mated APC connectors. This second edition (2022) replaces the 2006 edition and introduces normative references and visual requirements while clarifying text to avoid misuse.

Key topics and requirements

• Scope and purpose: Defines a set of controlled conditions for single‑mode APC connections to satisfy attenuation and RL grades for dispersion‑unshifted fibres.
• Performance modelling: Uses a Gaussian light intensity distribution over the specified mode field diameter (MFD) to model attenuation arising from:
  • MFD mismatch
  • Lateral core offsets
  • Angular core offsets
• Attenuation and return loss grades: Performance grades are referenced to IEC 61755-1; EN IEC 61755-2-2 sets the connection parameter criteria that support those grades for randomly mated APC pairs (table references include APC 8° configurations).
• Visual requirements: Adds normative visual inspection criteria for APC fibre endfaces to support RL performance.
• Normative test references: Aligns with IEC test procedures for return loss, random-mate attenuation and visual inspection (e.g., IEC 61300 series) and with single‑mode fibre product specs (IEC 60793-2-50).

Applications and users

Who uses EN IEC 61755-2-2:2022:

• Fibre optic connector and component manufacturers for design, acceptance and production specifications.
• Test laboratories and quality engineers implementing random‑mate attenuation and return‑loss verification.
• System integrators and network designers specifying connector performance for telecom, datacom and passive optical networks.
• Standards bodies and procurement teams requiring harmonized connector interface parameters for interoperability.

Practical uses:

• Specifying connector interface tolerances (MFD, lateral/ angular offsets) to meet target attenuation/RL grades.
• Creating test procedures and pass/fail criteria for APC connector production and incoming inspection.
• Ensuring interoperability and predictable performance when connectors are randomly mated in field deployments.

Related standards

Key cross‑references and normative documents:

• IEC 61755-1 - Connector optical interfaces for single‑mode fibres - General and guidance
• IEC 60793-2-50 - Single‑mode fibre product specifications
• IEC 61300-3-6 / -3-34 / -3-35 / -3-45 - Basic test and measurement procedures (return loss, random-mate attenuation, visual inspection, multi‑fibre attenuation)

EN IEC 61755-2-2:2022 is essential for anyone specifying or testing APC single‑mode connector interfaces, ensuring consistent attenuation and return‑loss behavior in practical deployments.

Standards Content (Sample)

SLOVENSKI STANDARD
01-december-2022
Nadomešča:
SIST EN 61755-2-2:2007
Optični spojni elementi in pasivne komponente - Vmesniki optičnih konektorjev za
enorodovna vlakna - 2-2. del: Parametri konektorjev za disperzijsko
nespremenjena, fizično staknjena optična vlakna - Poševno (IEC 61755-2-2:2022)
Fibre optic interconnecting devices and passive components - Connector optical
interfaces for single-mode fibres - Part 2-2: Connection parameters of dispersion
unshifted physically contacting fibres - Angled (IEC 61755-2-2:2022)
Lichtwellenleiter - Verbindungselemente und passive Bauteile - Optische Schnittstellen
für Lichtwellenleiter-Steckverbinder - Teil 2-2: Verbindungsparameter von nicht-
dispersionsverschobenen Einmodenfasern mit physikalischem Kontakt - angeschrägt
(IEC 61755-2-2:2022)
Dispositifs d'interconnexion et composants passifs fibroniques - Interfaces optiques des
connecteurs pour fibres unimodales - Partie 2-2: Paramètres de connexion des fibres en
contact physique à dispersion non décalée - avec angle (IEC 61755-2-2:2022)
Ta slovenski standard je istoveten z: EN IEC 61755-2-2:2022
ICS:
33.180.20 Povezovalne naprave za Fibre optic interconnecting
optična vlakna devices
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

EUROPEAN STANDARD EN IEC 61755-2-2

NORME EUROPÉENNE
EUROPÄISCHE NORM October 2022
ICS 33.180.20 Supersedes EN 61755-2-2:2006
English Version
Fibre optic interconnecting devices and passive components -
Connector optical interfaces for single-mode fibres - Part 2-2:
Connection parameters of dispersion unshifted physically
contacting fibres - Angled
(IEC 61755-2-2:2022)
Dispositifs d'interconnexion et composants passifs Lichtwellenleiter - Verbindungselemente und passive
fibroniques - Interfaces optiques des connecteurs pour Bauteile - Optische Schnittstellen für Lichtwellenleiter-
fibres unimodales - Partie 2-2: Paramètres de connexion Steckverbinder - Teil 2-2: Verbindungsparameter von nicht-
des fibres en contact physique à dispersion non décalée - dispersionsverschobenen Einmodenfasern mit
avec angle physikalischem Kontakt - angeschrägt
(IEC 61755-2-2:2022) (IEC 61755-2-2:2022)
This European Standard was approved by CENELEC on 2022-10-19. 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 CEN-CENELEC
Management Centre 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 CEN-CENELEC Management Centre has the
same status as the official versions.
CENELEC members are the national electrotechnical committees of Austria, Belgium, Bulgaria, Croatia, Cyprus, the Czech Republic,
Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, the
Netherlands, Norway, Poland, Portugal, Republic of North Macedonia, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland,
Türkiye and the United Kingdom.

European Committee for Electrotechnical Standardization
Comité Européen de Normalisation Electrotechnique
Europäisches Komitee für Elektrotechnische Normung
CEN-CENELEC Management Centre: Rue de la Science 23, B-1040 Brussels
© 2022 CENELEC All rights of exploitation in any form and by any means reserved worldwide for CENELEC Members.
Ref. No. EN IEC 61755-2-2:2022 E

European foreword
The text of document 86B/4640/FDIS, future edition 2 of IEC 61755-2-2, 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 approved by CENELEC as EN IEC 61755-2-2:2022.
The following dates are fixed:
• latest date by which the document has to be implemented at national (dop) 2023-07-19
level by publication of an identical national standard or by endorsement
• latest date by which the national standards conflicting with the (dow) 2023-10-19
document have to be withdrawn
This document supersedes EN 61755-2-2:2006 and all of its amendments and corrigenda (if any).
Attention is drawn to the possibility that some of the elements of this document may be the subject of
patent rights. CENELEC shall not be held responsible for identifying any or all such patent rights.
Any feedback and questions on this document should be directed to the users’ national committee. A
complete listing of these bodies can be found on the CENELEC website.
Endorsement notice
The text of the International Standard IEC 61755-2-2:2022 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 standard indicated:
IEC 61755-2-1 NOTE Harmonized as EN 61755-2-1
IEC 61755-3-2 NOTE Harmonized as EN 61755-3-2
IEC 61755-3-31 NOTE Harmonized as EN 61755-3-31
Annex ZA
(normative)
Normative references to international publications
with their corresponding European publications
The following documents are referred to in the text in such a way that some or all of their content
constitutes requirements 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 1 Where an International Publication has been modified by common modifications, indicated by (mod), the
relevant EN/HD applies.
NOTE 2 Up-to-date information on the latest versions of the European Standards listed in this annex is available
here: www.cenelec.eu.
Publication Year Title EN/HD Year
IEC 60793-2-50 - Optical fibres - Part 2-50: Product EN IEC 60793-2-50 -
specifications - Sectional specification for
class B single-mode fibres
IEC 61300-3-6 - Fibre optic interconnecting devices and EN 61300-3-6 -
passive components - Basic test and
measurement procedures - Part 3-6:
Examinations and measurements - Return
loss
IEC 61300-3-34 - Fibre optic interconnecting devices and EN 61300-3-34 -
passive components - Basic test and
measurement procedures - Part 3-34:
Examinations and measurements -
Attenuation of random mated connectors
IEC 61300-3-35 - Fibre optic interconnecting devices and EN 61300-3-35 -
passive components - Basic test and
measurement procedures - Part 3-35:
Examinations and measurements - Visual
inspection of fibre optic connectors and
fibre-stub transceivers
IEC 61300-3-45 - Fibre optic interconnecting devices and EN 61300-3-45 -
passive components - Basic test and
measurement procedures - Part 3-45:
Examinations and measurements -
Attenuation of random mated multi-fibre
connectors
IEC 61755-1 - Fibre optic interconnecting devices and EN IEC 61755-1 -
passive components - Connector optical
interfaces for single-mode fibres - Part 1:
Optical interfaces for dispersion unshifted
fibres - General and guidance
IEC 61755-2-2 ®
Edition 2.0 2022-09
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
colour
inside
Fibre optic interconnecting devices and passive components – Connector optical

interfaces for single-mode fibres –

Part 2-2: Connection parameters of dispersion unshifted physically contacting

fibres – Angled
Dispositifs d’interconnexion et composants passifs fibroniques – Interfaces

optiques des connecteurs pour fibres unimodales –

Partie 2-2: Paramètres de connexion des fibres en contact physique à dispersion

non décalée – avec angle
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
INTERNATIONALE
ICS 33.180.20 ISBN 978-2-8322-5698-5

– 2 – IEC 61755-2-2:2022 © IEC 2022
CONTENTS
FOREWORD . 3
1 Scope . 5
2 Normative references . 5
3 Terms and definitions . 5
4 Attenuation and return loss grades . 6
5 Criteria for a fit within attenuation and return loss grades . 6
5.1 General . 6
5.2 Attenuation grades and criteria . 7
5.3 Visual requirements for return loss grades . 8
Annex A (informative) Return loss model on angled connections . 10
Bibliography . 11

Figure 1 – Lateral offset and angular offset versus attenuation, η , for single-
combined
mode fibre with 8,9 µm MFD at 1 310 nm . 8

Table 1 – Single-mode random mate attenuation grades . 6
Table 2 – Single-mode return loss grades for APC (8°) . 6
Table 3 – MFD and fibre core nominal index of refraction . 7
Table 4 – Visual requirements for single-mode angle polished (APC) fibres
SM APC (RL ≥ 60 dB) . 9

IEC 61755-2-2:2022 © IEC 2022 – 3 –
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
FIBRE OPTIC INTERCONNECTING
DEVICES AND PASSIVE COMPONENTS –
CONNECTOR OPTICAL INTERFACES FOR SINGLE-MODE FIBRES –

Part 2-2: Connection parameters of dispersion
unshifted physically contacting fibres – Angled

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. IE
...