EN 60825-2:2004

SLOVENSKI STANDARD
01-junij-2005
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SIST EN 60825-2:2001
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Safety of laser products -- Part 2: Safety of optical fibre communication systems (OFCS)
Sicherheit von Lasereinrichtungen -- Teil 2: Sicherheit von Lichtwellenleiter-
Kommunikationssystemen (LWLKS)
Sécurité des appareils à laser -- Partie 2: Sécurité des systèmes de télécommunication
par fibres optiques (STFO)
Ta slovenski standard je istoveten z: EN 60825-2:2004
ICS:
31.260 Optoelektronika, laserska Optoelectronics. Laser
oprema equipment
33.180.01 6LVWHPL]RSWLþQLPLYODNQLQD Fibre optic systems in
VSORãQR general
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

EUROPEAN STANDARD EN 60825-2
NORME EUROPÉENNE
EUROPÄISCHE NORM October 2004

ICS 31.260 ; 33.180.01 Supersedes EN 60825-2:2000

English version
Safety of laser products
Part 2: Safety of optical fibre communication systems (OFCS)
(IEC 60825-2:2004)
Sécurité des appareils à laser Sicherheit von Lasereinrichtungen
Partie 2: Sécurité des systèmes Teil 2: Sicherheit von Lichtwellenleiter-
de télécommunication par fibres optiques Kommunikationssystemen (LWLKS)
(STFO) (IEC 60825-2:2004)
(CEI 60825-2:2004)
This European Standard was approved by CENELEC on 2004-09-01. 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, Cyprus, Czech
Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia,
Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Slovakia, Slovenia, Spain, Sweden,
Switzerland and United Kingdom.
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

© 2004 CENELEC - All rights of exploitation in any form and by any means reserved worldwide for CENELEC members.

Ref. No. EN 60825-2:2004 E
Foreword
The text of document 76/288/FDIS, future edition 3 of IEC 60825-2, prepared by IEC TC 76, Optical
radiation safety and laser equipment, was submitted to the IEC-CENELEC parallel vote and was
approved by CENELEC as EN 60825-2 on 2004-09-01.
This European Standard supersedes EN 60825-2:2000. It constitutes a technical revision to bring the
hazard level nomenclature used in this document into correspondence with the revised classification
system introduced in amendment A2:2001 to EN 60825-1:1994. Additionally, the standard has been
thoroughly revised throughout.

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) 2005-06-01
– latest date by which the national standards conflicting
with the EN have to be withdrawn (dow) 2007-09-01
Annex ZA has been added by CENELEC.
__________
Endorsement notice
The text of the International Standard IEC 60825-2:2004 was approved by CENELEC as a European
Standard without any modification.
__________
- 3 - EN 60825-2:2004
Annex ZA
(normative)
Normative references to international publications
with their corresponding European publications
The following referenced documents are indispensable for the application of this document. For dated
references, only the edition cited applies. For undated references, the latest edition of the referenced
document (including any amendments) applies.
NOTE Where an international publication has been modified by common modifications, indicated by (mod), the relevant
EN/HD applies.
Publication Year Title EN/HD Year
IEC 60825-1 1993 Safety of laser products EN 60825-1 1994
Part 1: Equipment classification, + Corr. February 1995
requirements and user's guide
A1 1997 A1 2002
A2 2001 A2 2001
INTERNATIONAL IEC
STANDARD 60825-2
Third edition
2004-06
Safety of laser products –
Part 2:
Safety of optical fibre communication
systems (OFCS)
© IEC 2004 ⎯ Copyright - all rights reserved
No part of this publication may be reproduced or utilized in any form or by any means, electronic or
mechanical, including photocopying and microfilm, without permission in writing from the publisher.
International Electrotechnical Commission, 3, rue de Varembé, PO Box 131, CH-1211 Geneva 20, Switzerland
Telephone: +41 22 919 02 11 Telefax: +41 22 919 03 00 E-mail: inmail@iec.ch Web: www.iec.ch
PRICE CODE
Commission Electrotechnique Internationale
X
International Electrotechnical Commission
Международная Электротехническая Комиссия
For price, see current catalogue

– 2 – 60825-2 © IEC:2004(E)
CONTENTS
FOREWORD.4

1 Scope and object.6
2 Normative references.7
3 Terms and definitions .7
4 Requirements.10
4.1 General.10
4.2 Protective housing of OFCS.10
4.3 Fibre cables.10
4.4 Cable connectors.10
4.5 Automatic power reduction (APR) and restart pulses .11
4.6 Labelling or marking.12
4.7 Organizational requirements .13
4.8 Assessment of hazard level .15
4.9 Hazard level requirements by location type .16

Annex A (informative) Rationale .17
Annex B (informative) Summary of requirements at locations in OFCS .18
Annex C (informative) Methods of hazard/safety analysis .19
Annex D (informative) Application notes for the safe use of OFCS .20
Annex E (informative) Guidance for service and maintenance .44
Annex F (informative) Clarification of the meaning of “hazard level” .47

Bibliography .49

Figure D.1 – PON (passive optical network)-based system .30
Figure D.2 – Simple laser drive circuit .32
Figure D.3 – Risk graph example from IEC 61508-5 Clause D.5.35
Figure D.4 – Graph of FIT rate and mean time to repair .38

Table D.1 – OFCS power limits for 11 µm single mode (SM) fibres and 0,18 numerical
aperture multimode (MM) fibres (core diameter < 150 µm) .23
Table D.2 – Relation between the number of fibres in a ribbon fibre and the maximum
permitted power (example).29
Table D.3 – Identification of components and failure modes (example).32
Table D.4 – Beta values (example).33
Table D.5 – Determination of failure rates (example) .34
Table D.6 – Consequence classification from IEC 61508-5 Table D.1.35
Table D.7 – Frequency classification from IEC 61508-5 Table D.1 .36
Table D.8 – Possibility of avoiding hazard classification from IEC 61508-5 Table D.1 .36
Table D.9 – Classification of the probability of the unwanted occurrence from
IEC 61508-5 Table D.1 .36
Table D.10 – Modes of operation – Definitions from IEC 61508-4, 3.5.12 .37

60825-2 © IEC:2004(E) – 3 –
Table D.11 – SIL Values from IEC 61508-1, 7.6.2.9 .37
Table D.12 – Determination of equipment monitoring classification .39
Table D.13 – FIT rates from example above .40
Table D.14 – Examples of power limits for OFCS having automatic power reduction to
reduce emissions to a lower hazard level .43

– 4 – 60825-2 © IEC:2004(E)
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
SAFETY OF LASER PRODUCTS –
Part 2: Safety of optical fibre communication systems (OFCS)

FOREWORD
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International Standard IEC 60825-2 has been prepared by IEC technical committee 76:
Optical radiation safety and laser equipment
This third edition cancels and replaces the second edition published in 2000. It constitutes a
technical revision to bring the hazard level nomenclature used in this document into
correspondence with the revised classification system introduced in IEC 60825-1(2001).
Additionally, the standard has been thoroughly revised throughout.
The text of this standard i
...