Bsi bs en 60793 1 46 2002

Unknown BRITISH STANDARD BS EN 60793 1 46 2002 Optical fibres — Part 1 46 Measurement methods and test procedures — Monitoring of changes in optical transmittance The European Standard EN 60793 1 46 2[.]

Optical fibres —

Part 1-46: Measurement methods and

test procedures — Monitoring of

changes in optical transmittance

The European Standard EN 60793-1-46:2002 has the status of a

British Standard

ICS 33.180.10

This British Standard, having

been prepared under the

direction of the

Electrotechnical Sector Policy

and Strategy Committee, was

published under the authority

of the Standards Policy and

Strategy Committee on

23 May 2002

© BSI 23 May 2002

ISBN 0 580 39705 X

National foreword

This British Standard is the official English language version of

EN 60793-1-46:2002 It is identical with IEC 60793-1-46:2001 It partly supersedes BS EN 188000:1994 which will be withdrawn upon publication of the full BS EN 60793-1 series of standards

The UK participation in its preparation was entrusted by Technical Committee GEL/86, Fibre optics, to Subcommittee GEL/86/1, Optical fibres and cables, which has the responsibility to:

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

From 1 January 1997, all IEC publications have the number 60000 added to the old number For instance, IEC 27-1 has been renumbered as IEC 60027-1 For a period of time during the change over from one numbering system to the other, publications may contain identifiers from both systems

Cross-references

The British Standards which implement international or European publications referred to in this document may be found in the BSI Standards Catalogue under the section entitled “International Standards Correspondence Index”, or by using the “Find” facility of the BSI Standards Electronic

Catalogue

A British Standard does not purport to include all the necessary provisions of

a contract Users of British Standards are responsible for their correct application

Compliance with a British Standard does not of itself confer immunity from legal obligations.

— aid enquirers to understand the text;

— present to the responsible international/European committee any enquiries on the interpretation, or proposals for change, and keep the

UK interests informed;

— monitor related international and European developments and promulgate them in the UK

Summary of pages

This document comprises a front cover, an inside front cover, the EN title page, pages 2 to 12, an inside back cover and a back cover

The BSI copyright date displayed in this document indicates when the document was last issued

Amendments issued since publication

Amd No Date Comments

NORME EUROPÉENNE

EUROPÄISCHE NORM February 2002

CENELEC

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

Central Secretariat: rue de Stassart 35, B - 1050 Brussels

ICS 33.180.10 Partly supersedes EN 188000:1992

English version

Optical fibres Part 146: Measurement methods and test procedures

-Monitoring of changes in optical transmittance

(IEC 60793-1-46:2001)

Fibres optiques

Partie 1-46: Méthodes de mesure

et procédures d'essai

-Contrôle des variations du facteur

de transmission optique

(CEI 60793-1-46:2001)

Lichtwellenleiter Teil 1-46: Messmethoden und Prüfverfahren -Überwachung der optischen Übertragungsänderungen (IEC 60793-1-46:2001)

This European Standard was approved by CENELEC on 2001-07-03 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, Czech Republic, Denmark, Finland, France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Malta, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and United Kingdom

EN 69703-1-642:200 - - 2

Foreword

The text of document 86A/675/FDIS, future edition 1 of IEC 60793-1-46, prepared by SC 86A, Fibres

and cables, of IEC TC 86, Fibre optics, was submitted to the IEC-CENELEC parallel vote and was

approved by CENELEC as EN 60793-1-46 on 2001-07-03

This European Standard supersedes subclause 4.27 (test method 316) and subclause 4.28 (test

method 317) of EN 188000:1992

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) 2002-09-01

– latest date by which the national standards conflicting

with the EN have to be withdrawn (dow) 2004-07-01

Annexes designated "normative" are part of the body of the standard

In this standard, annexes A, B and ZA are normative

Annex ZA has been added by CENELEC

Compared to IEC 60793-1:1989 and IEC 60793-2:1992, IEC/SC 86A has adopted a revised structure

of the new IEC 60793 series: The individual measurement methods and test procedures for optical

fibres are published as "Part 1-XX"; the product standards are published as "Part 2-XX"

The general relationship between the new series of EN 60793 and the superseded European

Standards of the EN 188000 series is as follows:

EN 60793-1-XX Optical fibres Part 1-XX: Measurement methods

and test procedures Individual subclauses ofEN 188000:1992

EN 60793-2-XX Optical fibres Part 2-XX: Product specifications EN 188100:1995

EN 188101:1995

EN 188102:1995

EN 188200:1995

EN 188201:1995

EN 188202:1995

EN 60793-1-4X consists of the following parts, under the general title: Optical fibres:

- Part 1-40: Measurement methods and test procedures – Attenuation

- Part 1-41: Measurement methods and test procedures – Bandwidth

- Part 1-42: Measurement methods and test procedures – Chromatic dispersion

- Part 1-43: Measurement methods and test procedures – Numerical aperture

- Part 1-44: Measurement methods and test procedures – Cut-off wavelength

- Part 1-45: Measurement methods and test procedures – Mode field diameter

- Part 1-46: Measurement methods and test procedures – Monitoring of changes in optical

transmittance

- Part 1-47: Measurement methods and test procedures – Macrobending loss

- Part 1-48: Measurement methods and test procedures – Under consideration

- Part 1-49: Measurement methods and test procedures – Under consideration

Endorsement notice

The text of the International Standard IEC 60793-1-46:2001 was approved by CENELEC as a European

Standard without any modification

EN 60793−1−46:2002

INTRODUCTION 4

1 Scope 5

2 Normative references 5

3 Reference test method 5

4 Apparatus 5

5 Sampling and specimens 6

5.1 Specimen length 6

5.2 Specimen end face 6

5.3 Specimen preparation 6

5.4 Reference specimen 6

6 Procedure 6

7 Calculations 6

8 Results 6

8.1 Information to be provided with each measurement 6

8.2 Information available upon request 6

9 Specification information 7

Annex A (normative) Requirements specific to method A – Change in transmittance by transmitted power 8

Annex B (normative) Requirements specific to method B – Change in transmittance by backscattering 11

Annex ZA (normative) Normative references to international publications with their corresponding European publications 12

Figure A.1 – Measurement of change in optical transmittance using reference specimen 9

Figure A.2 – Measurement of change in optical transmittance using stabilized source 9

60793-1-46 © IEC:2001 – 4 –

INTRODUCTION

Publications in the IEC 60793-1 series concern measurement methods and test procedures as

they apply to optical fibres

Within the same series several different areas are grouped, as follows:

– parts 1-10 to 1-19: General

– parts 1-20 to 1-29: Measurement methods and test procedures for dimensions

– parts 1-30 to 1-39: Measurement methods and test procedures for mechanical

characteristics

– parts 1-40 to 1-49: Measurement methods and test procedures for transmission and optical

characteristics

– parts 1-50 to 1-59: Measurement methods and test procedures for environmental

characteristics

EN 60793−1−46:2002

OPTICAL FIBRES – Part 1-46: Measurement methods and test procedures – Monitoring of changes in optical transmittance

1 Scope

This part of IEC 60793 establishes uniform requirements for the monitoring of changes in

optical transmittance, thereby assisting in the inspection of fibres and cables for commercial

purposes

This standard gives two methods for monitoring the changes in optical transmittance of optical

fibres and cables that occur during mechanical or environmental testing, or both It provides a

monitor in the change of optical transmission characteristics arising from optical discontinuity,

physical defects and modifications of the attenuation slope:

– method A: change in transmittance by transmitted power;

– method B: change in transmittance by backscattering

Methods A and B apply to the monitoring of all categories of the following fibres:

– class A: multimode fibres;

– class B: single-mode fibres

Information common to both measurements is contained in clauses 1 to 8, and information

pertaining to each individual method appears in annexes A, and B respectively

2 Normative references

The following normative documents contain provisions which, through reference in this text,

constitute provisions of this International Standard For dated references, subsequent

amendments to, or revisions of, any of these publications do not apply However, parties to

agreements based on this International Standard are encouraged to investigate the possibility

of applying the most recent editions of the normative documents indicated below For undated

references, the latest edition of the normative document referred to applies Members of IEC

and ISO maintain registers of currently valid International Standards

IEC 60793-1-40, Optical fibres – Part 1-40: Measurement methods and test procedures –

Attenuation

3 Reference test method

Under consideration

4 Apparatus

Annexes A and B include layout drawings and other equipment requirements that individually

apply for each of the methods, respectively

60793-1-46 © IEC:2001 – 6 –

5 Sampling and specimens

5.1 Specimen length

The minimum length of the specimen shall be such that the changes in attenuation are

compatible with the resolution of the measurement apparatus, and the non-linearities at the

beginning and end of it shall not affect the results

5.2 Specimen end face

Prepare a flat end face, orthogonal to the fibre axis, at the input and output ends of each

specimen

5.3 Specimen preparation

Prepare the specimen as described in the appropriate mechanical, environmental, or other test

method specified

5.4 Reference specimen

In methods where a reference specimen is used, it shall comprise an identical kind of optical

fibre or cable to the specimen and shall be linked between the optical divider and detector, as

shown in figure A.1 It may be a short length of fibre The condition of the reference specimen

shall be constant during the whole test

6 Procedure

For individual procedures, see annexes A and B for methods A and B, respectively

7 Calculations

For calculation procedures, see the appropriate annex: A and B, respectively

8 Results

8.1 Information to be provided with each measurement

Report the following information with each measurement:

– date and title of measurement;

– identification of specimen;

– optical source wavelength, l;

– specimen length;

– conditions of the environment and measurement equipment;

– changes in optical transmittance, D h; h = 1,2,3, preferably plotted in a graph versus test

parameters

8.2 Information available upon request

The following information shall be available upon request:

– measurement method used: A or B;

– type of optical source used and its spectral width (FWHM);

EN 60793−1−46:2002

– launching technique used;

– description of all key equipment;

– details of computation technique;

– date of latest calibration of measurement equipment

9 Specification information

The detail specification shall specify the following information:

– type of fibre to be measured;

– failure or acceptance criteria;

– information to be reported;

– any deviations from the procedure that apply

60793-1-46 © IEC:2001 – 8 –

Annex A

(normative)

Requirements specific to method A – Change in transmittance by transmitted power

A.1 Apparatus

A.1.1 General

The arrangement shall provide a monitoring for optical transmittance with high resolution and

good stability over the time and temperature changes given in the relevant product

specification

Figure A.1 is an example of a typical arrangement suitable for use when carrying out

mechanical or environmental tests in a laboratory or factory By comparison with a reference

sample, it provides a measurement of the change in optical transmittance, corrected for any

changes that might occur in the optical source Connections shall have stable coupling

conditions

Figure A.2 is an example of a typical arrangement suitable for use in the field, laboratory or

factory where long-term tests are required, in cases where it is possible to stabilize the optical

source by optical feedback If the stability of the optical source is compatible with the accuracy

needed for the measurement, then the insertion loss measurement method (method B of

IEC 60793-1-40) may be used

A.1.2 Optical source

Use an suitable source such as a laser or light-emitting diode, emitting at wavelengths

compatible with the optical fibres under test It is customary to modulate the optical source and

wavelength selective optical filters may be used

A.1.3 Optical divider

The optical divider shall have a splitting ratio that remains constant during the test The

splitting ratio and temperature stability shall be as shown in the relevant detail specification

Commercially available or custom built devices may be used

A.1.4 Optical detector

The optical detector shall be of sufficient area to intercept all of the radiated power in the

output cone and shall be sufficiently linear over the optical powers encountered

EN 60793−1−46:2002

Figure A.1 – Measurement of change in optical transmittance using reference specimen

Figure A.2 – Measurement of change in optical transmittance using stabilized source

The optical detector shall have a sufficiently uniform response over the active area and range

of incidence angle at the measurement wavelength to ensure the movement of the output cone

in position or angle relative to the detector This shall be within the limits determined by the

mechanical design of the measurement equipment and shall not significantly affect the results

Where more than one detector is used, as in the arrangement shown in figure A.1, the

detectors shall be of the same manufacturer and model, and be of comparable linearity

A.1.5 Launch apparatus

Provide apparatus to produce a full or restricted launch, depending on the parameter being

measured, with conditions as shown in IEC 60793-1-40, methods A and B, for both multimode

and single-mode fibre Use cladding mode strippers at the source and detector ends of the

specimen, and of the reference specimen if used

IEC 704/01

IEC 705/01