oSIST prEN IEC 61755-3-7:2025

SLOVENSKI STANDARD
01-september-2025
Optični spojni elementi in pasivne komponente - Vmesniki optičnih konektorjev - 3
-7. del: Nekotne cilindrične kompozitne tulke s premerom 2,5 mm in 1,25 mm, pri
katerih je titan uporabljen kot material za obod vlaken
Fibre optic interconnecting devices and passive components - Connector optical
interfaces - Part 3-7: Connector parameters of non-dispersion shifted single mode
physically contacting fibres - Non-angled 2,5 mm and 1,25 mm diameter cylindrical
composite ferrules using titanium as fibre surrounding material
Dispositifs d'interconnexion et composants passifs à fibres optiques- Interfaces optiques
de connecteurs - Partie 3-7: Paramètres de connecteurs pour fibres unimodales à
dispersion non décalée en contact physique - Férules composites cylindriques de
diamètre non incliné de 2,5 mm et 1,25 mm, utilisant le titane comme matériau entourant
les fibres
Ta slovenski standard je istoveten z: prEN IEC 61755-3-7:2025
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.

86B/5069/CDV
COMMITTEE DRAFT FOR VOTE (CDV)

PROJECT NUMBER:
IEC 61755-3-7 ED2
DATE OF CIRCULATION: CLOSING DATE FOR VOTING:
2025-06-27 2025-09-19
SUPERSEDES DOCUMENTS:
86B/4975/CD, 86B/5018A/CC
IEC SC 86B : FIBRE OPTIC INTERCONNECTING DEVICES AND PASSIVE COMPONENTS
SECRETARIAT: SECRETARY:
Japan Mr Ryo Koyama
OF INTEREST TO THE FOLLOWING COMMITTEES: HORIZONTAL FUNCTION(S):

ASPECTS CONCERNED:
SUBMITTED FOR CENELEC PARALLEL VOTING NOT SUBMITTED FOR CENELEC PARALLEL VOTING
Attention IEC-CENELEC parallel voting
The attention of IEC National Committees, members of
CENELEC, is drawn to the fact that this Committee Draft
for Vote (CDV) is submitted for parallel voting.
The CENELEC members are invited to vote through the
CENELEC online voting system.
This document is still under study and subject to change. It should not be used for reference purposes.
Recipients of this document are invited to submit, with their comments, notification of any relevant patent rights of
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Recipients of this document are invited to submit, with their comments, notification of any relevant “In Some
Countries” clauses to be included should this proposal proceed. Recipients are reminded that the CDV stage is
the final stage for submitting ISC clauses. (SEE AC/22/2007 OR NEW GUIDANCE DOC).

TITLE:
Fibre optic interconnecting devices and passive components - Connector optical interfaces -
Part 3-7: Connector parameters of non-dispersion shifted single mode physically contacting
fibres - non-angled 2,5 mm and 1,25 mm diameter cylindrical composite ferrules using titanium
as fibre surrounding material
PROPOSED STABILITY DATE: 2033
NOTE FROM TC/SC OFFICERS:
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IEC CDV 61755-3-7 © IEC 2025
1 CONTENTS
3 FOREWORD . 2
4 1 Scope . 4
5 2 Normative references . 4
6 3 Terms and definitions . 4
7 4 Description . 4
8 5 Interface parameters . 5
9 Annex A (informative)  Maximum allowed spherical fibre undercut . 9
10 Annex B (informative)  Expected attenuation when mated to reference connector
11 plugs . 11
12 Annex C (informative)  Guidance related to simulation of optical interface attenuation . 12
13 Bibliography . 16
15 Figure 1 – Interface dimensions for PC ferrule . 6
16 Figure 2 – Fibre core locations after termination . 6
17 Figure 3 – Connector end-face dimensions of the contact zone . 7
18 Figure A.1 – Allowable undercut as a function of endface radius and apex offset – 4,9
19 N minimum contact force . 10
20 Figure A.2 – Allowable undercut as a function of endface radius and apex offset – 2,9
21 N minimum contact force . 10
22 Figure C.1 – MFD distribution used in the design curve calculation . 13
23 Figure C.2 – Resultant fibre core to ferrule eccentricity distribution for Grade B
24 attenuation (over 20000 randomly mated connectors) . 14
25 Figure C.3 – Resultant fibre angle distribution for Grade B attenuation (over 20000
26 randomly mated connectors) . 14
27 Figure C.4 – Scatterplot of fibre core eccentricities for Grade B attenuation (over
28 20000 randomly mated connectors) . 15
29 Figure C.5 – Histogram indicating attenuation distribution of a Grade B optical
30 Interface (over 20000 randomly mated connectors) . 15
32 Table 1 – Optical interface parameter values for 2,5 mm diameter PC ferrule . 7
33 Table 2 – Optical interface parameter values for 1,25 mm diameter PC ferrule . 8
34 Table B.1 - Descriptive statistics when performance grades are mated against a
35 reference interface . 11
36 Table C.1 – MFD and fibre core nominal index of refraction . 13
IEC CDV 61755-3-7 © IEC 2025
40 INTERNATIONAL ELECTROTECHNICAL COMMISSION
41 ____________
43 FIBRE OPTIC INTERCONNECTING DEVICES AND PASSIVE COMPONENTS
44 – CONNECTOR OPTICAL INTERFACES –
46 Part 3-7: Connector parameters of non-dispersion shifted single mode
47 physically contacting fibres - non-angled 2,5 mm and 1,25 mm diameter
48 cylindrical composite ferrules using titanium as fibre surrounding
49 material
52 FOREWORD
53 1) The International Electrotechnical Commission (IEC) is a worldwide organization for standardization comprising
54 all national electrotechnical committees (IEC National Committees). The object of IEC is to promote international
55 co-operation on all questions concerning standardization in the electrical and electronic fields. To this end and
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69 4) In order to promote international uniformity, IEC National Committees undertake to apply IEC Publications
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75 6) All users should ensure that they have the latest edition of this publication.
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77 members of its technical committees and IEC National Committees for any personal injury, property damage or
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79 expenses arising out of the publication, use of, or reliance upon, this IEC Publication or any other IEC Publications.
80 8) Attention is drawn to the Normative references cited in this publication. Use of the referenced publications is
81 indispensable for the correct application of this publication.
82 9) Attention is drawn to the possibility that some of the elements of this IEC Publication may be the subject of patent
83 rights. IEC shall not be held responsible for identifying any or all such patent rights.
84 International Standard IEC 61755-3-7 has been prepared by subcommittee SC86B: Fibre optic
85 interconnecting devices and passive components, of IEC technical committee 86: Fibre optics.
86 This second edition cancels and replaces the first edition published in 2009. It constitutes a technical
87 revision. The changes with respect to the previous edition are:
89 a) harmonization with the other level 3 optical interface documents (IEC 61755-3-1);
90 b) addition of the reference grades in Table 1 and Table 2;
91 c) addition of the Annex B and C.
92 The text of this standard is based on the following documents:
FDIS Report on voting
XX/XX/FDIS XX/XX/RVD
IEC CDV 61755-3-7 © IEC 2025
94 Full information on the voting for the approval of this standard can be found in the report on
95 voting indicated in the above table.
96 This publication has been drafted in accordance with the ISO/IEC Directives, Part 2.
97 The committee has decided that the contents of this publication will remain unchanged until the
98 stability date indicated on the IEC web site under "http://webstore.iec.ch" in the data related to
99 the specific publication. At this date, the publication will be
100 • reconfirmed,
101 • withdrawn,
102 • replaced by a revised edition, or
103 • amended.
105 The National Committees are requested to note that for this publication the stability date is .
106 THIS TEXT IS INCLUDED FOR THE INFORMATION OF THE NATIONAL COMMITTEES AND WILL BE DELETED
107 AT THE PUBLICATION STAGE.
IEC CDV 61755-3-7 © IEC 2025
111 FIBRE OPTIC INTERCONNECTING DEVICES AND PASSIVE COMPONENTS
112 – CONNECTOR OPTICAL INTERFACES –
114 Part 3-7: Connectors parameters of non-dispersion shifted single mode
115 physically contacting fibres - non-angled 2,5 mm and 1,25 mm diameter
116 cylindrical composite ferrules using titanium as fibre surrounding
117 material
119 1 Scope
120 This part of IEC 61755 defines dimensional limits of an optical connector with a 2,5 mm and a
121 1,25 mm diameter cylindrical composite ferrule using titanium as fibre surrounding material for
122 optical interface to meet specific requirements for PC fibre-to-fibre interconnection as defined
123 in IEC 61755-2-1. The composite ferrule uses different materials in the end-face contact zone
124 and in ferrule to sleeve contact zone. The specified materials for each zone are zirconia (ZrO )
125 for the ferrule to sleeve contact zone and titanium for the end-face contact zone. Ferrules made
126 from the material specified in this standard are suitable for use in all operating service
127 environments categories defined in IEC 61753-1.
128 NOTE If mated within the same family (cylindrical PC ferrule), the ferrules specified in this standard are intended to
129 have the same optical attenuation performance grade for connections with all ferrules described in IEC 61755-3
130 series documents.
132 2 Normative references
133 The following documents, in whole or in part, are normatively referenced in this document and
134 are indispensable for its application. For dated references, only the edition cited applies. For
135 undated references, the latest edition of the referenced document (including any amendments)
136 applies.
137 IEC 61753-1, Fibre optic interconnecting devices and passive components - Performance
138 standard - Part 1: General and guidance
139 IEC 61755-2-1, Fibre optic interconnecting devices and passive components - Connector optical
140 interfaces for single-mode fibres - Part 2-1: Connection parameters of dispersion unshifted
141 physically contacting fibres - Non-angled
142 3 Terms and definitions
143 No terms and definitions are listed in this document.
144 ISO and IEC maintain terminological databases for use in standardization at the following
145 addresses:
146 • IEC Electropedia: available at https://www.electropedia.org/
147 • ISO Online browsing platform: available at https://www.iso.org/obp
148 4 Description
149 The performance of a cylindrical ferrule optical interface is determined by the accuracy with
150 which the optical datum targets of two mating ferrules are aligned with each other. There are
151 three conditions affecting the alignment of two optical datum targets, lateral offset, angular
152 offset and longitudinal offset.
153 Parameters influencing the lateral and angular offset of the optical fibre axes include the
154 following:
155 • ferrule outside diameter;
156 • ferrule bore concentricity relative to the ferrule outside diameter;
157 • ferrule bore angle relative to outside diameter axis;
IEC CDV 61755-3-7 © IEC 20
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