Bsi bs en 61755 3 7 2009

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NO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAW

BSI British Standards

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

BS EN 61755-3-7:2009

National foreword

This British Standard is the UK implementation of EN 61755-3-7:2009 It is identical to IEC 61755-3-7:2009

The UK participation in its preparation was entrusted by Technical Committee GEL/86, Fibre optics, to Subcommittee GEL/86/2, Fibre optic interconnecting devices and passive components

A list of organizations represented on this committee can be obtained on request to its secretary

This publication does not purport to include all the necessary provisions of a contract Users are responsible for its correct application

© BSI 2009 ISBN 978 0 580 59157 0 ICS 33.180.20

Compliance with a British Standard cannot confer immunity from legal obligations.

This British Standard was published under the authority of the Standards Policy and Strategy Committee on 30 September 2009

Amendments issued since publication

Amd No Date Text affected

EUROPEAN STANDARD EN 61755-3-7

NORME EUROPÉENNE

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

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

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)

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)

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

EN 61755-3-7:2009 – 2 –

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

– latest date by which the national standards conflicting

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)

– 2 – 61755-3-7 © IEC:2009

CONTENTS

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 – 5 –

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

1 Scope

This part of IEC 61755 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

NOTE If mated within the same family (cylindrical PC ferrule), the ferrules specified in this standard are intended

to have the same optical attenuation performance grade for connections with all ferrules described in different parts of IEC 61775-3

2 Description

The performance of a cylindrical 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 two 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:

• ferrule outside diameter;

• fibre hole concentricity relative to the ferrule outside diameter;

• fibre hole angle relative to outside diameter axis;

• fibre cladding diameter to fibre hole clearance;

• alignment sleeve inside diameter;

• fibre core concentricity relative to the cladding diameter;

• fibre core orientation relative to keying feature

Parameters influencing the longitudinal offset of the optical fibre axes include the following:

• end face spherical radius;

• end face spherical radius apex offset;

• fibre undercut;

• axial force on ferrule end face;

• ferrule and fibre material physical constants;

• alignment sleeve frictional force

– 6 – 61755-3-7 © IEC:2009

3 Interface parameters for PC ferrule independent from the ferrule material

No sharp edge

K

D

J

Ferrule axis Fibre axis

E

IEC 2295/08

Figure 1 – Interface dimensions for PC ferrule

F

IEC 1315/06

Figure 2 – Fibre core location

F defines the radial coordinate limits of the optical fibre core relative to the optical datum of

the ferrule

61755-3-7 © IEC:2009 – 7 –

C

A

B

IEC 2113/06

Figure 3 – Interface dimension of the end-face contact zone Table 1 – Optical interface parameter values for 2,5 mm diameter PC ferrule

Parameter values

Ref

Minimum Maximum Minimum Maximum Minimum Maximum Minimum Maximum

a Contact force 4,9 N minimum Ferrule material: titanium Nominal material physical constant values: Young’s

Modulus, E = 105 GPa, Poisson’s Ratio, ν = 0,34

⎠

⎞

⎜

⎝

+

×

−

×

b A negative value indicates fibre protrusion

– 8 – 61755-3-7 © IEC:2009

Table 2 – Optical interface parameter values for 1,25 mm diameter PC ferrule

Parameter Values

Ref

Minimum Maximum Minimum Maximum Minimum Maximum Minimum Maximum

a Contact force 2,9 N minimum Ferrule material: titanium Nominal material physical constant values:

Young’s Modulus, E = 105 GPa, Poisson’s Ratio, ν = 0,34

⎠

⎞

⎜

⎝

+

×

−

×

b A negative value indicates fibre protrusion

61755-3-7 © IEC:2009 – 9 –

Annex A

(informative)

Maximum allowed spherical fibre undercut

the parameters influencing the longitudinal offset of the optical fibre axes as defined by [A.1]

PFW DTE

3 2 6 2 6

k 1

⎠

⎞

⎜

⎝

+

×

−

×

where

AMaximum is the maximum spherical undercut for physical contact (nm);

DDTE is the differential thermal expansion between the ferrule material and the silica

fibre at maximum operating temperature (nm) DDTE between the Ti-composite

ferrule material and the silica fibre at maximum operating temperature is 50 nm;

predicted by the first three terms in [A.1] (nm) DPFW for the Ti-composite ferrule

is 30 nm

End face deformation term as a function of contact force, end face radius and material

properties

2

1 B k

Geometric compensation term for the offset of the ferrule apex from the fibre axis

3 2 6 2

⎠

⎞

⎜

⎝

+

– 10 – 61755-3-7 © IEC:2009

Bibliography

standard – Part 1: General and guidance for performance standards

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