SIST EN 61755-3-31:2016

Fibre optic interconnecting devices and passive components - Fibre optic connector optical interfaces - Part 3-31: Optical interface, 8 degrees angled PC, Polyphenylene sulphide rectangular ferrule, single mode fibres (IEC 61755-3-31:2015)

This part of IEC 61755 defines certain dimensional limits of an angled PC rectangular
polyphenylene sulphide (PPS) ferrule optical interface in order to meet specific requirements
for fibre-to-fibre interconnection. Ferrules made from the material specified in this standard
are suitable for use in categories C, U, E, and O as defined in IEC 61753-1.
Ferrule interface dimensions and features are contained in the IEC 61754 series, which deals
with fibre optic connector interfaces.

Lichtwellenleiter - Verbindungselemente und passive Bauteile - Optische Schnittstellen für Lichtwellenleiter-Steckverbinder - Teil 3-31: Optische Schnittstelle rechteckige Polyphenylensulfid-Ferrule 8 Grad abgewinkelt physikalischer Kontakt für Einmodenfasern (IEC 61755-3-31:2015)

Dispositifs d'interconnexion et composants passifs à fibres optiques - Interfaces optiques de connecteurs - Partie 3-31: Paramètres de connecteurs pour fibres unimodales à dispersion non décalée, en contact physique - Férules rectangulaires avec angle en poly(sulfure de phénylène) (IEC 61755-3-31:2015)

L'IEC 61755-3-31:2015 définit un certain nombre de limites dimensionnelles des interfaces optiques à férules rectangulaires en poly(sulfure de phénylène) (PPS), PC avec angle afin de satisfaire aux exigences particulières d'une interconnexion fibre à fibre. Les férules réalisées dans le matériau spécifié dans la présente norme sont adaptées à une utilisation dans les catégories C, U, E et O définies dans l'IEC 61753-1. Les dimensions et les caractéristiques des interfaces des férules sont contenues dans la série IEC 61754 qui traite des interfaces de connecteurs pour fibres optiques.
Mots clés: limites dimensionnelles des interfaces optiques à férules rectangulaires en poly(sulfure de phénylène) (PPS), PC avec angle afin, interconnexion fibre à fibre

Optični spojni elementi in pasivne komponente - Optični vmesniki optičnih konektorjev - 3-31. del: Optični vmesnik, PC pod kotom 8 stopinj, pravokotna tulka iz polifenilen sulfida, enorodovna optična vlakna (IEC 61755-3-31:2015)

Ta del standarda IEC 61755 določa nekatere omejitve glede mer optičnega vmesnika PC pod kotom, pravokotna tulka iz polifenilen sulfida (PPS), za namen izpolnjevanja določenih zahtev za spajanje vlaken. Tulke, izdelane iz materialov, ki so določeni v tem standardu, so primerne za uporabo v kategorijah C, U, E in O, kot je opredeljeno v standardu IEC 61753-1. Mere in značilnosti vmesnika tulke so vključene v serijo IEC 61754, ki obravnava vmesnike optičnih konektorjev.

General Information

• Status: Published
• Publication Date: 06-Jan-2016
• ICS: 33.180.20 - Fibre optic interconnecting devices
• Technical Committee: MOC - Mobile Communications
• Current Stage: 6060 - National Implementation/Publication (Adopted Project)
• Start Date: 21-Sep-2015
• Due Date: 26-Nov-2015
• Completion Date: 07-Jan-2016
• Ref Project: EN 61755-3-31:2015 - Fibre optic interconnecting devices and passive components - Connector optical interfaces - Part 3-31: Connector parameters of non-dispersion shifted single mode physically contacting fibres - Angled polyphenylene sulphide rectangular ferrules

Standards Content (Sample)

SLOVENSKI STANDARD
SIST EN 61755-3-31:2016
01-februar-2016
2SWLþQLVSRMQLHOHPHQWLLQSDVLYQHNRPSRQHQWH2SWLþQLYPHVQLNLRSWLþQLK
NRQHNWRUMHYGHO2SWLþQLYPHVQLN3&SRGNRWRPVWRSLQMSUDYRNRWQDWXOND
L]SROLIHQLOHQVXOILGDHQRURGRYQDRSWLþQDYODNQD,(&
Fibre optic interconnecting devices and passive components - Fibre optic connector
optical interfaces - Part 3-31: Optical interface, 8 degrees angled PC, Polyphenylene
sulphide rectangular ferrule, single mode fibres (IEC 61755-3-31:2015)
Lichtwellenleiter - Verbindungselemente und passive Bauteile - Optische Schnittstellen
für Lichtwellenleiter-Steckverbinder - Teil 3-31: Optische Schnittstelle rechteckige
Polyphenylensulfid-Ferrule 8 Grad abgewinkelt physikalischer Kontakt für
Einmodenfasern (IEC 61755-3-31:2015)
Dispositifs d'interconnexion et composants passifs à fibres optiques - Interfaces optiques
de connecteurs - Partie 3-31: Paramètres de connecteurs pour fibres unimodales à
dispersion non décalée, en contact physique - Férules rectangulaires avec angle en poly
(sulfure de phénylène) (IEC 61755-3-31:2015)
Ta slovenski standard je istoveten z: EN 61755-3-31:2015
ICS:
33.180.20 3RYH]RYDOQHQDSUDYH]D Fibre optic interconnecting
RSWLþQDYODNQD devices
SIST EN 61755-3-31:2016 en
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

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SIST EN 61755-3-31:2016

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SIST EN 61755-3-31:2016


EUROPEAN STANDARD EN 61755-3-31

NORME EUROPÉENNE

EUROPÄISCHE NORM
September 2015
ICS 33.180.20

English Version
Fibre optic interconnecting devices and passive components -
Connector optical interfaces - Part 3-31: Connector parameters
of non-dispersion shifted single mode physically contacting fibres
- Angled polyphenylene sulphide rectangular ferrules
(IEC 61755-3-31:2015)
Dispositifs d'interconnexion et composants passifs à fibres Lichtwellenleiter - Verbindungselemente und passive
optiques - Interfaces optiques de connecteurs - Bauteile - Optische Schnittstellen für Lichtwellenleiter-
Partie 3-31: Paramètres de connecteurs pour fibres Steckverbinder - Teil 3-31: Optische Schnittstelle
unimodales à dispersion non décalée, en contact physique - rechteckige Polyphenylensulfid-Ferrule 8 Grad abgewinkelt
Férules rectangulaires avec angle en poly(sulfure de physikalischer Kontakt für Einmodenfasern
phénylène) (IEC 61755-3-31:2015)
(IEC 61755-3-31:2015)
This European Standard was approved by CENELEC on 2015-07-17. 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, Former Yugoslav Republic of Macedonia, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia,
Lithuania, Luxembourg, Malta, the Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland,
Turkey and the United Kingdom.


European Committee for Electrotechnical Standardization
Comité Européen de Normalisation Electrotechnique
Europäisches Komitee für Elektrotechnische Normung
CEN-CENELEC Management Centre: Avenue Marnix 17, B-1000 Brussels
© 2015 CENELEC All rights of exploitation in any form and by any means reserved worldwide for CENELEC Members.
 Ref. No. EN 61755-3-31:2015 E

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SIST EN 61755-3-31:2016
EN 61755-3-31:2015
European foreword
The text of document 86B/3888/FDIS, future edition 1 of IEC 61755-3-31, 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 61755-3-31:2015.

The following dates are fixed:
(dop) 2016-04-17
• latest date by which the document has to be
implemented at national level by
publication of an identical national
standard or by endorsement
• latest date by which the national (dow) 2018-07-17
standards conflicting with the
document have to be withdrawn

Attention is drawn to the possibility that some of the elements of this document may be the subject of
patent rights. CENELEC [and/or CEN] shall not be held responsible for identifying any or all such
patent rights.

Endorsement notice
The text of the International Standard IEC 61755-3-31:2015 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 standards indicated:

IEC 61753-1 NOTE Harmonized as EN 61753-1.
IEC 61755-2-1 NOTE Harmonized as EN 61755-2-1.
2

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SIST EN 61755-3-31:2016
EN 61755-3-31:2015
Annex ZA
(normative)

Normative references to international publications
with their corresponding European publications

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.

NOTE 1 When 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 - EN 60793-2-50 -
Part 2-50: Product specifications -
Sectional specification for class B single-
mode fibres
IEC 61300-3-30 -  Fibre optic interconnecting devices and EN 61300-3-30 -
passive components - Basic test and
measurement procedures -
Part 3-30: Examinations and
measurements - Polish angle and fibre
position on single ferrule multifibre
connectors
IEC 61300-3-52 -  Fibre optic interconnecting devices and EN 61300-3-52 -
passive components - Basic test and
measurement procedures -
Part 3-52: Examinations and
measurements - Guide hole and alignment
pin deformation constant, CD for 8 degree
angled PC rectangular ferrule, single mode
fibres
IEC 61754 Series Fibre optic interconnecting devices and EN 61754 Series
passive components - Fibre optic
connector interfaces
IEC 61754-5 2005 Fibre optic connector interfaces - EN 61754-5 2005
Part 5: Type MT connector family
IEC 61754-7 2008 Fibre optic interconnecting devices and EN 61754-7 2008
passive components - Fibre optic
connector interfaces -
Part 7: Type MPO connector family
IEC 61754-7-1 2014 Fibre optic interconnecting devices and EN 61754-7-1 2014
passive components - Fibre optic
connector interfaces -
Part 7-1: Type MPO connector family -
One fibre row
IEC 61754-10 2005 Fibre optic connector interfaces - EN 61754-10 2005
Part 10: Type Mini-MPO connector family
IEC 61754-18 2001 Fibre optic connector interfaces - EN 61754-18 2002
Part 18: Type MT-RJ connector family + corr. April 2002
IEC 61755-1 -  Fibre optic connector optical interfaces - EN 61755-1 -
Part 1: Optical interfaces for single mode
non-dispersion shifted fibres - General and
guidance

3

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SIST EN 61755-3-31:2016

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SIST EN 61755-3-31:2016




IEC 61755-3-31

®


Edition 1.0 2015-06




INTERNATIONAL



STANDARD




NORME



INTERNATIONALE
colour

inside










Fibre optic interconnecting devices and passive components – Connector

optical interfaces –

Part 3-31: Connector parameters of non-dispersion shifted single mode


physically contacting fibres – Angled polyphenylene sulphide rectangular

ferrules




Dispositifs d’interconnexion et composants passifs à fibres optiques –

Interfaces optiques de connecteurs –

Partie 3-31: Paramètres de connecteurs pour fibres unimodales à dispersion

non décalée, en contact physique – Férules rectangulaires avec angle en

poly(sulfure de phénylène)









INTERNATIONAL

ELECTROTECHNICAL

COMMISSION


COMMISSION

ELECTROTECHNIQUE


INTERNATIONALE




ICS 33.180.20 ISBN 978-2-8322-2712-1



Warning! Make sure that you obtained this publication from an authorized distributor.

Attention! Veuillez vous assurer que vous avez obtenu cette publication via un distributeur agréé.

® Registered trademark of the International Electrotechnical Commission
Marque déposée de la Commission Electrotechnique Internationale

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SIST EN 61755-3-31:2016
– 2 – IEC 61755-3-31:2015  IEC 2015
CONTENTS
FOREWORD . 3
1 Scope . 5
2 Normative references . 5
3 Description . 6
4 Interface parameters . 6
Annex A (informative) Theoretical worst-case connector attenuation yield percentage . 16
Annex B (normative) Minus coplanarity . 19
Annex C (informative) Minimum normal force required to achieve physical contact . 20
Bibliography . 25

Figure 1 – Fibre numbering conventions . 7
Figure 2 – Interface dimensions related to lateral and angular offset . 8
Figure 3 – Alignment pin geometry . 8
Figure 4 – Interface dimensions related to longitudinal offset . 9
Figure A.1 – Monte Carlo simulation of Grade B performance for 12-fibre connectors . 16
Figure B.1 – Illustration of fibre line and minus coplanarity parameters . 19
Figure C.1 – Geometry limit, GL, needed to mate 12 fibres, as a function of absolute X-
angle, SX for different magnitudes of minus coplanarity and flat fibre tips. 21
Figure C.2 – Geometry limit, GL, needed to mate 12 fibres, as a function of absolute
X-angle, SX for different magnitudes of minus coplanarity and 1 mm fibre tips. . 21

Table 1 – Optical interface variant information . 7
Table 2 – Optical interface dimensions related to lateral and angular offset for optical
interface variant 1002 . 10
Table 3 – Optical interface dimensions related to lateral and angular offset for optical
interface variants 1104, 1108, 1112 . 11
Table 4 – Optical interface end face geometry dimensions related to physical contact
for optical interface variant 1002 . 12
Table 5 – Optical interface end face geometry dimensions related to physical contact
for optical interface variant 1104 . 13
Table 6 – Optical interface end face geometry dimensions related to physical contact
for optical interface variant 1108 . 14
Table 7 – Optical interface end face geometry dimensions related to physical contact
for optical interface variant 1112 . 15
Table A.1 – Grade B single channel vs. multi-fibre connector performance . 17
Table A.2 – Grade C single channel vs. multi-fibre connector performance . 17
Table A.3 – Grade D single channel vs. multi-fibre connector performance . 17
Table C.1 – Parameter constants for 4-fibre optical interface variant 1104 . 23
Table C.2 – Parameter constants for 8-fibre optical interface variant 1108 . 24
Table C.3 – Parameter constants for 12-fibre optical interface variant 1112 . 24

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SIST EN 61755-3-31:2016
IEC 61755-3-31:2015  IEC 2015 – 3 –
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________

FIBRE OPTIC INTERCONNECTING
DEVICES AND PASSIVE COMPONENTS –
CONNECTOR OPTICAL INTERFACES –

Part 3-31: Connector parameters of non-dispersion
shifted single mode physically contacting fibres –
Angled polyphenylene sulphide rectangular ferrules

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 61755-3-31 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/3888FDIS 86B/3914/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.

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SIST EN 61755-3-31:2016
– 4 – IEC 61755-3-31:2015  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.

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.

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SIST EN 61755-3-31:2016
IEC 61755-3-31:2015  IEC 2015 – 5 –
FIBRE OPTIC INTERCONNECTING
DEVICES AND PASSIVE COMPONENTS –
CONNECTOR OPTICAL INTERFACES –

Part 3-31: Connector parameters of non-dispersion
shifted single mode physically contacting fibres –
Angled polyphenylene sulphide rectangular ferrules



1 Scope
This part of IEC 61755 defines certain dimensional limits of an angled PC rectangular
polyphenylene sulphide (PPS) ferrule optical interface in order to meet specific requirements
for fibre-to-fibre interconnection. Ferrules made from the material specified in this standard
are suitable for use in categories C, U, E, and O as defined in IEC 61753-1.
Ferrule interface dimensions and features are contained in the IEC 61754 series, which deals
with fibre optic connector interfaces.
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 61300-3-30, Fibre optic interconnecting devices and passive components – Basic test and
measurement procedures – Part 3-30: Examinations and measurements – Polish angle and
fibre position on single ferrule multifibre connectors
IEC 61300-3-52, Fibre optic interconnecting devices and passive components – Basic test and
measurement procedures – Part 3-52: Examinations and measurements – Guide hole and
alignment pin deformation constant, CD for 8 degree angled PC rectangular ferrule, single
mode fibres
IEC 61754 (all parts), Fibre optic interconnecting devices and passive components – Fibre
optic connector interfaces
IEC 61754-5:2005, Fibre optic connector interfaces – Part 5: Type MT connector family
IEC 61754-7:2008, Fibre optic interconnecting devices and passive components – Fibre optic
connector interfaces – Part 7: Type MPO connector family
IEC 61754-7-1:2014, Fibre optic interconnecting devices and passive components – Fibre
optic connector interfaces – Part 7-1: Type MPO connector family – One fibre row
IEC 61754-10:2005, Fibre optic connector interfaces – Part 10: Type Mini-MPO connector
family
IEC 61754-18:2001, Fibre optic connector interfaces – Part 18: Type MT-RJ connector family

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SIST EN 61755-3-31:2016
– 6 – IEC 61755-3-31:2015  IEC 2015
IEC 61755-1, Fibre optic connector optical interfaces – Part 1: Optical interfaces for single
mode non-dispersion shifted fibres – General and guidance
3 Description
The performance of a single mode angled PC rectangular ferrule optical interface is
determined by the accuracy with which the optical datum targets of two mating ferrules are
aligned with each other. There are three conditions affecting the alignment of the optical
datum targets: lateral offset, angular offset, and longitudinal offset.
Parameters influencing the lateral and angular offset of the optical fibre axes include the
following:
– fibre hole deviation from designated location;
– fibre cladding diameter relative to fibre hole clearance;
– fibre hole angular misalignment;
– fibre core concentricity relative to the cladding diameter;
– alignment pin diameter relative to the guide hole clearance.
Parameters influencing the longitudinal offset of the optical fibre axes include the following:
– fibre protrusion;
– fibre array minus coplanarity;
– adjacent fibre height differential;
– end face angle in the x-axis;
– end face angle in the y-axis;
– end face radius in the x-axis;
– end face radius in the y-axis;
– fibre tip spherical radii;
– axial force on ferrule end face;
– ferrule and fibre material constants;
– frictional force of alignment pins in ferrule guide holes.
4 Interface parameters
This standard defines the dimensional limits of angled PC rectangular ferrules with a single
row of up to 12 fibres. The fibre centres are spaced with a nominal alignment pitch of 0,25 mm.
Interface variants, which identify nominal ferrule cross-sections and applicable fibre counts,
are given in Table 1. The fibre numbering conventions are illustrated in Figure 1.
Optical interface dimensions related to lateral and angular offset are defined in Figure 2 and
the alignment pin geometry is shown in Figure 3. The end face geometry parameters that
influence longitudinal offset are outlined in Figure 4.
The parameter values related to lateral and angular offset are given in Table 2 and Table 3.
End face geometry limits associated with longitudinal offset are specified in Table 4 to Table 7.

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SIST EN 61755-3-31:2016
IEC 61755-3-31:2015Ó IEC 2015 – 7 –
Table 1 – Optical interface variant information
Nominal ferrule
Variant Number
a
cross section
b,c
number of fibres
(mm´ mm)
1002 2,45´ 4,4 2
1104 2,45´ 6,4 4
1108 2,45´ 6,4 8
1112 2,45´ 6,4 12
a
Refer to the applicable IEC 61754 series fibre optic connector interface standard for
dimensional requirements.
b
The four digit variant code describes a combination of material type, nominal ferrule
cross-section, and number of fibres. The first digit defines 1 for PPS ferrule
materials; the second digit represents 2,45 mm´ 4,4 mm with 0 and 2,45 mm´ 6,4
mm with 1; and the last two digits designates the number of fibres.
c
All ferrule materials for rectangular type ferrules are intended to be intermateable,
in the lowest specified performance category as described within IEC 61755-1,
provided that the last three digits of the variant number are the same. It is also
possible to mate ferrules with different fibre counts, in which case all mating fibres
shall meet the designated performance category.
IEC
Figure 1 – Fibre numbering conventions
To provide optical fibre-to-fibre interconnection, mating ferrules have to be correctly keyed.
Refer to the applicable IEC 61754 series document to ensure correct key orientation.

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SIST EN 61755-3-31:2016
– 8 – IEC 61755-3-31:2015  IEC 2015
Key
2× ØD
ØA U V
Y
ØE U
C
XX
Yi
V
U
Xi
B

IEC
Figure 2 – Interface dimensions related to lateral and angular offset
The optical interface coordinate system is established with an x-axis, which passes through
the guide hole centres and a perpendicular y-axis that passes through the midpoint of the line
connecting the guide hole centres.
The basic x-location, Xi, for each fibre core centre is defined as:
Xi = (2i – n – 1) 0,125
th
Where, i corresponds to the i fibre per the numbering conventions outlined in Figure 1 and n
is the total number of fibres in the array.
The basic y-location, Yi, for each fibre core centre is defined as:
D − D
o i
Yi=α + C

D
2
The basic alignment pin dimension, D , is 0,698 5 mm and the basic guide hole dimension, D ,
i o
is a nominal value based on the manufacturer designed average hole size. The constant, α,
relates to differences in guide pin pitch and varies between 0 and 1. The term C is a
D
deformation constant based on ferrule structure, material, and moulding condition. Typical
values C are between 0,3 µm and 0,6 µm. Refer to IEC 61300-3-52 for information on how to
D
measure and define Yi.
To ensure compatibility when mating rectangular ferrules with alternative Yi targets,
manufacturers of ferrules shall report their specified values for Yi, α, D , and C .
o D
Rz < G
ØJ
K
IEC

Figure 3 – Alignment pin geometry

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SIST EN 61755-3-31:2016
IEC 61755-3-31:2015  IEC 2015 – 9 –
Key
Region of interest
YY
SX
RF
SY
XX
RY
CF
HA
H
RX
Four fibres shown for simplicity

IEC
Figure 4 – Interface dimensions related to longitudinal offset
The optical interface coordinate system is established with an x-axis, which passes through
the guide hole centres, a perpendicular y-axis that passes through the midpoint of the line
connecting the guide hole centres, and an orthogonal z-axis pointing away from the ferrule.
All parameters are illustrated as positive values with respect to the defined coordinate system.
Concave ferrule radii are indicated by negative values.

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SIST EN 61755-3-31:2016
– 10 – IEC 61755-3-31:2015  IEC 2015
Table 2 – Optical interface dimensions related to lateral
and angular offset for optical interface variant 1002
Parameter values
Grade B Grade C Grade D
Ref. Units Remarks
Minimum Maximum Minimum Maximum Minimum Maximum
a,b
A
- 0,001 6 - 0,002 4 - 0,003 4 mm Core position
B
2,598 2,602 2,598 2,602 2,598 2,602 mm Hole pitch

C - 0,2 - 0,2 - 0,2 Fibre angle error
°
c
D 0,699 0 0,699 6 0,699 0 0,700 0 0,699 0 0,700 0 mm Diameter
d
E - 0,012 - 0,012 - 0,012 mm Hole parallelism
G - 200 - 200 - 200 nm RMS roughness
J 0,698 4 0,698 6 0,698 0 0,699 0 0,698 0 0,699 0 mm Diameter
K - 0,000 5 - 0,000 5 - 0,000 5 mm Cylindricity
NOTE 1 The core location and tilt angle values specified in this standard have been calculated to ensure
that the attenuation values specified in IEC 61755-2-1 are met, under all circumstances, at the single
channel level. Refer to Annex A for the relationship between per channel and per connector loss statistics.
NOTE 2 Refer to Figure 2 and Figure 3 for dimensional references.
a
Variation in fibre core centre location, as controlled by true position tolerance ∅A, is composed of
several parameters including the fibre hole deviation, clearance between fibre cladding and hole, and
relative fibre core-to-cladding concentricity. Wherever possible, inspection of the core centre shall be
directly measured. Where this is not possible, due to inspection system capability or other constraints,
the relevant component features may be independently measured and superimposed to establish a
resultant fibre core location.
b
If the fibre core centre location is not directly measured for grade B performance, the fibre hole true
position target shall be less than 0,001 2 mm for ferrules terminated to optical fibres specified in
IEC 60793-2-50 with a fibre hole diameter ranging between 0,125 5 mm and 0,126 5 mm.
c
Each guide hole shall accept a gauge pin as shown in Figure 4 of IEC 61754-10:2005 and Figure 1c of
IEC 61754-18:2001 to a depth of 5,5 mm with a maximum force of 1,7 N. In addition, two guide holes
shall accept a gauge as shown in Figure 5 of IEC 61754-10:2005 and Figure 1d of IEC 61754-18:2001 to
a depth of 5,5 mm with a maximum force of 3,4 N.
d
Parall
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