Fibre optic connector optical interfaces - Part 3-7: Optical Interface, 2,5 mm and 1,25 mm diameter cylindrical PC composite ferrule using Titanium as fibre surrounding material, single mode fibre (IEC 61755-3-7:2009)

IEC 61755-3-7:2009 defines dimensional limits and material properties of a 2,5 mm and a 1,25 mm diameter cylindrical composite ferrule optical interface to meet specific requirements for PC fibre-to-fibre interconnection. The composite ferrule uses different materials in the end face contact zone and in ferrule to sleeve contact zone. The specified materials for each zone are zirconia (ZrO2) for the ferrule to sleeve contact zone and titanium for the end face contact zone. 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.

Lichtwellenleiter - Verbindungselemente und passive Bauteile - Optische Schnittstellen von Lichtwellenleiter-Steckverbindern - Teil 3-7: Optische Schnittstelle - Zylindrische PC-Composite-Ferrulen mit 2,5 mm und 1,25 mm Durchmesser für Einmodenfaser, mit Titan als Material für die Faserfassung, Einmoden LWL (IEC 61755-3-7:2009)

Dispositifs d'interconnexion et composants passifs à fibres optiques - Interfaces optiques de connecteurs pour fibres optiques - Partie 3-7: Interfaces optiques, férules composites cylindriques PC, de diamètre 2,5 mm et 1,25 mm, utilisant le titane comme matériau entourant la fibre, fibres unimodales (CEI 61755-3-7:2009)

La CEI 61755-3-7:2009 définit les limites dimensionnelles et les propriétés du matériau de l'interface optique d'une férule cylindrique en composite, de diamètre 2,5 mm et 1,25 mm afin de satisfaire aux exigences des interconnexions fibre-à-fibre PC. La férule composite met en jeu différents matériaux dans la zone de contact des extrémités de fibres, et dans la zone de contact manchon - férule. Les matériaux spécifiques pour chaque zone sont le zircone (ZrO2) pour la zone de contact férule - manchon, et le titane pour la zone de contact de l'extrémité. Les férules constituées par le matériau spécifié dans la présente norme sont adaptées à une utilisation dans les catégories C, U, E et O, telles que définies dans la CEI 61753-1.

Optični vmesniki za optične konektorje - 3-7. del: Optični vmesnik, cilindrična polikarbonatna tulka s premeroma 2,5 mm in 1,25 mm, obdajajoči material vlaken iz titana, enorodno vlakno (IEC 61755-3-7:2009)

General Information

Status
Published
Publication Date
11-May-2009
Technical Committee
iTEL - Communication cables
Current Stage
6060 - National Implementation/Publication (Adopted Project)
Start Date
08-Apr-2009
Due Date
13-Jun-2009
Completion Date
12-May-2009

Relations

Effective Date
24-Jan-2023
Effective Date
26-Jan-2021

Overview

SIST EN 61755-3-7:2009 is a European standard harmonized with the international standard IEC 61755-3-7:2009. It specifies the optical interface parameters and material properties for fibre optic connectors that utilize cylindrical physical contact (PC) composite ferrules with diameters of 2.5 mm and 1.25 mm. A distinctive feature of this standard is the use of titanium as the fibre-surrounding material in the ferrule end face contact zone, combined with zirconia (ZrO2) in the ferrule-to-sleeve contact zone. This combination ensures reliable single mode fibre-to-fibre interconnections with precise dimensional tolerances and enhanced mechanical and optical performance.

The standard targets fibre optic interconnecting devices and passive components, focusing on the interface critical for maintaining low optical loss and high durability in physical contact connections. It supports categories C, U, E, and O as defined in IEC 61753-1, emphasizing compatibility and performance consistency within a family of cylindrical PC ferrules.

Key Topics

  • Composite Ferrule Construction: The ferrule is composed of titanium around the fibre end face to provide robustness and stable optical contact, with zirconia used for the sleeve contact zone to ensure precise mechanical alignment.

  • Dimensional Limits: The standard defines strict tolerances for ferrule diameter, fibre hole concentricity, and end face geometry to minimize lateral, angular, and longitudinal offsets in mating connectors.

  • Optical Interface Parameters: Includes detailed specifications on:

    • Ferrule outside diameter: 2.4985 to 2.4995 mm (2.5 mm ferrule) and 1.2485 to 1.2495 mm (1.25 mm ferrule).
    • Fibre core radial location and concentricity.
    • End face spherical radius and apex offset.
    • Contact force minimums specific to ferrule size (4.9 N for 2.5 mm, 2.9 N for 1.25 mm ferrules).
    • Maximum allowed fibre undercut calculated considering physical contact and thermal expansion effects.
  • Material Properties: Titanium ferrule end face offers tailored mechanical properties such as a Young’s modulus of 105 GPa and Poisson’s ratio of 0.34, ensuring durability and stable physical contact under mechanical stresses.

  • Performance Considerations: The standard accounts for physical phenomena influencing optical alignment, including thermal expansion differences between ferrule and fibre materials, mechanical contact forces, and fibre protrusion or undercut for optimal mating.

Applications

SIST EN 61755-3-7:2009 is critical for manufacturers and engineers involved in the design, production, and quality assurance of fibre optic connectors utilizing single mode fibres. Practical applications include:

  • Telecommunications Networks: Ensuring low-loss, high-reliability connections in fibre optic patch cords, distribution frames, and backbone cabling.

  • Data Centers: Providing standardized connector interfaces that support seamless fibre-to-fibre mating and ease of maintenance.

  • Industrial and Medical Equipments: Supplying rugged connectors with stable physical contact for sensitive fibre optic sensing or high-speed data transmission.

  • High-Performance Optical Systems: Used in environments where alignment precision and material resilience directly impact system performance and service life.

The standard enables component interoperability across different manufacturers following the IEC 61755 series, enhancing supply chain robustness and minimizing optical attenuation in single mode fibre connections.

Related Standards

  • IEC 61753-1: Defines performance categories (C, U, E, O) for fibre optic interconnecting devices and passive components, with EN 61755-3-7 ferrules being suitable for several of these categories.

  • IEC 61755-3 (all parts): Provides broader specifications on optical interfaces for fibre optic connectors, ensuring compatibility and standardization within connector designs.

  • IEC 61753 Series: Covers general and detailed performance standards for fibre optic components, complementing the design and testing guidelines of EN 61755-3-7.

By adhering to SIST EN 61755-3-7:2009, fibre optic connectors achieve consistent optical performance, mechanical reliability, and compliance with international best practices, facilitating efficient global deployment of optical fibre networks.


Keywords: EN 61755-3-7, IEC 61755-3-7, fibre optic connector, composite ferrule, titanium ferrule, cylindrical PC ferrule, single mode fibre, fibre optic interface standard, optical fibre interconnection, fibre optic connector dimensions, zirconia ferrule, fibre alignment, optical attenuation, fibre undercut, physical contact ferrule, optical interface parameters, fibre optic standardization.

Standard

SIST EN 61755-3-7:2009

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Frequently Asked Questions

SIST EN 61755-3-7:2009 is a standard published by the Slovenian Institute for Standardization (SIST). Its full title is "Fibre optic connector optical interfaces - Part 3-7: Optical Interface, 2,5 mm and 1,25 mm diameter cylindrical PC composite ferrule using Titanium as fibre surrounding material, single mode fibre (IEC 61755-3-7:2009)". This standard covers: IEC 61755-3-7:2009 defines dimensional limits and material properties of a 2,5 mm and a 1,25 mm diameter cylindrical composite ferrule optical interface to meet specific requirements for PC fibre-to-fibre interconnection. The composite ferrule uses different materials in the end face contact zone and in ferrule to sleeve contact zone. The specified materials for each zone are zirconia (ZrO2) for the ferrule to sleeve contact zone and titanium for the end face contact zone. 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.

IEC 61755-3-7:2009 defines dimensional limits and material properties of a 2,5 mm and a 1,25 mm diameter cylindrical composite ferrule optical interface to meet specific requirements for PC fibre-to-fibre interconnection. The composite ferrule uses different materials in the end face contact zone and in ferrule to sleeve contact zone. The specified materials for each zone are zirconia (ZrO2) for the ferrule to sleeve contact zone and titanium for the end face contact zone. 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.

SIST EN 61755-3-7:2009 is classified under the following ICS (International Classification for Standards) categories: 33.180.20 - Fibre optic interconnecting devices. The ICS classification helps identify the subject area and facilitates finding related standards.

SIST EN 61755-3-7:2009 has the following relationships with other standards: It is inter standard links to oSIST prEN IEC 61755-3-7:2025, oSIST prEN IEC 61755-3-7:2025. Understanding these relationships helps ensure you are using the most current and applicable version of the standard.

SIST EN 61755-3-7:2009 is available in PDF format for immediate download after purchase. The document can be added to your cart and obtained through the secure checkout process. Digital delivery ensures instant access to the complete standard document.

Standards Content (Sample)


SLOVENSKI STANDARD
01-junij-2009
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Fibre optic connector optical interfaces - Part 3-7: Optical Interface, 2,5 mm and 1,25 mm
diameter cylindrical PC composite ferrule using Titanium as fibre surrounding material,
single mode fibre (IEC 61755-3-7:2009)
Lichtwellenleiter - Verbindungselemente und passive Bauteile - Optische Schnittstellen
von Lichtwellenleiter-Steckverbindern - Teil 3-7: Optische Schnittstelle - Zylindrische PC
-Composite-Ferrulen mit 2,5 mm und 1,25 mm Durchmesser für Einmodenfaser, mit
Titan als Material für die Faserfassung, Einmoden LWL (IEC 61755-3-7:2009)
Dispositifs d'interconnexion et composants passifs à fibres optiques - Interfaces optiques
de connecteurs pour fibres optiques - Partie 3-7: Interfaces optiques, férules composites
cylindriques PC, de diamètre 2,5 mm et 1,25 mm, utilisant le titane comme matériau
entourant la fibre, fibres unimodales (CEI 61755-3-7:2009)
Ta slovenski standard je istoveten z: EN 61755-3-7:2009
ICS:
33.180.20 3RYH]RYDOQHQDSUDYH]D Fibre optic interconnecting
RSWLþQDYODNQD devices
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

EUROPEAN STANDARD
EN 61755-3-7
NORME EUROPÉENNE
April 2009
EUROPÄISCHE NORM
ICS 33.180.20
English version
Fibre optic interconnecting devices and passive components -
Fibre optic connector optical interfaces -
Part 3-7: Optical interface,
2,5 mm and 1,25 mm diameter cylindrical PC composite ferrule
using titanium as fibre surrounding material,
single mode fibre
(IEC 61755-3-7:2009)
Dispositifs d'interconnexion  Lichtwellenleiter -
et composants passifs à fibres optiques - Verbindungselemente
Interfaces optiques de connecteurs und passive Bauteile -
pour fibres optiques - Optische Schnittstellen
Partie 3-7: Interfaces optiques, von Lichtwellenleiter-Steckverbindern -
férules composites cylindriques PC, Teil 3-7: Optische Schnittstelle -
de diamètre 2,5 mm et 1,25 mm, Zylindrische PC-Composite-Ferrulen
utilisant le titane comme matériau mit 2,5 mm und 1,25 mm Durchmesser
entourant la fibre, fibres unimodales für Einmodenfaser, mit Titan als Material
(CEI 61755-3-7:2009) für die Faserfassung, Einmoden LWL
(IEC 61755-3-7:2009)
This European Standard was approved by CENELEC on 2009-03-01. 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 Central Secretariat 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 Central Secretariat has the same status as the official versions.

CENELEC members are the national electrotechnical committees of Austria, Belgium, Bulgaria, Cyprus, the
Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia,
Lithuania, Luxembourg, Malta, the Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain,
Sweden, Switzerland and the United Kingdom.

CENELEC
European Committee for Electrotechnical Standardization
Comité Européen de Normalisation Electrotechnique
Europäisches Komitee für Elektrotechnische Normung

Central Secretariat: avenue Marnix 17, B - 1000 Brussels

© 2009 CENELEC - All rights of exploitation in any form and by any means reserved worldwide for CENELEC members.
Ref. No. EN 61755-3-7:2009 E
Foreword
The text of document 86B/2768/FDIS, future edition 1 of IEC 61755-3-7, 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 was approved by CENELEC as EN 61755-3-7 on 2009-03-01.
The following dates were fixed:
– latest date by which the EN has to be implemented
at national level by publication of an identical
national standard or by endorsement (dop) 2009-12-01
– latest date by which the national standards conflicting
with the EN have to be withdrawn (dow) 2012-03-01
__________
Endorsement notice
The text of the International Standard IEC 61755-3-7:2009 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 61753-1:2007 (not modified).
IEC 61755-3 NOTE  Harmonized in EN 61755-3 series (modified).
__________
IEC 61755-3-7
Edition 1.0 2009-01
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
Fibre optic interconnecting devices and passive components – Fibre optic
connector optical interfaces –
Part 3-7: Optical interface, 2,5 mm and 1,25 mm diameter cylindrical PC composite
ferrule using titanium as fibre surrounding material, single mode fibre

Dispositifs d'interconnexion et composants passifs à fibres optiques – Interfaces
optiques de connecteurs pour fibres optiques –
Partie 3-7: Interfaces optiques, férules composites cylindriques PC, de diamètre
2,5 mm et 1,25 mm, utilisant le titane comme matériau entourant la fibre, fibres
unimodales
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
PRICE CODE
INTERNATIONALE
K
CODE PRIX
ICS 33.180.20 ISBN 2-8318-1023-2
– 2 – 61755-3-7 © IEC:2009
CONTENTS
FOREWORD.3
1 Scope.5
2 Description .5
3 Interface parameters for PC ferrule independent from the ferrule material .6
Annex A (informative) .9
Bibliography.10

Figure 1 – Interface dimensions for PC ferrule .6
Figure 2 – Fibre core location .6
Figure 3 – Interface dimension of the end-face contact zone.7

Table 1 – Optical interface parameter values for 2,5 mm diameter PC ferrule .7
Table 2 – Optical interface parameter values for 1,25 mm diameter PC ferrule .8

61755-3-7 © IEC:2009 – 3 –
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
FIBRE OPTIC INTERCONNECTING
DEVICES AND PASSIVE COMPONENTS –
FIBRE OPTIC CONNECTOR OPTICAL INTERFACES –

Part 3-7: Optical interface, 2,5 mm and 1,25 mm diameter
cylindrical PC composite ferrule using titanium as fibre
surrounding material, single mode fibre

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 effor
...

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