1、BRITISH STANDARDBS EN 60825-2:2004+A2:2010Safety of laser products Part 2: Safety of optical fibre communication systems (OFCS)ICS 31.260; 33.180.01nullnull nullnullnullnullnullnullnull nullnullnullnullnullnullnull nullnullnull nullnullnullnullnullnullnullnullnullnull nullnullnullnullnullnull nullnu
2、ll nullnullnullnullnullnullnullnullnull nullnull nullnullnullnullnullnullnullnullnull nullnullnullNational forewordThis British Standard is the UK implementation of EN 60825-2:2004+A2:2010. It is identical to IEC 60825-2:2004, incorporating amendments 1:2006 and 2:2010. It supersedes BS EN 60825-2:2
3、004+A1:2007 which will be withdrawn on 1 October 2013.National Annex NA added with IEC Interpretation Sheet 1 (January 2007).The start and finish of text introduced or altered by amendment is indicated in the text by tags. Tags indicating changes to IEC text carry the number of the IEC amendment. Fo
4、r example, text altered by IEC amendment 1 is indicated by !“.The UK participation in its preparation was entrusted to Technical Committee EPL/76, Optical radiation safety and laser equipment.A list of organizations represented on this committee can be obtained on request to its secretary.This publi
5、cation does not purport to include all the necessary provisions of a contract. Users are responsible for its correct application.Compliance with a British Standard cannot confer immunity from legal obligations.BS EN 60825-2:2004+A2:2010This British Standard was published under the authority of the S
6、tandards Policy and Strategy Committee on12 November 2004 BSI 2011Amendments/corrigenda issued since publicationAmd. No. Date Comments 17036 30 March 2007 Implementation of IEC amendment 1:2006 with CENELEC endorsement A1:200731 July 2008 National Annex introduced with IEC Interpretation Sheet 1 (Ja
7、nuary 2007)Implementation of IEC amendment 2:2010 with CENELEC endorsement A1:2010ISBN 978 0 580 63970 831 March 2011EUROPEAN STANDARD EN 60825-2:2004+A2NORME EUROPENNE EUROPISCHE NORMOctober C E N E L E C E u r o p e a n C o m m i t t e e f o r E l e c t r o t e c h n i c a l S t a n d a r d i z a
8、t i o nCom it Europen de N orm alis at ion Electr otec hnique Eur opisc hes Kom itee f r Elek trot echnische Norm ung C e n t r a l S e c r e t a r i a t : r u e d e S t a s s a r t 3 5 , B - 1 0 5 0 B r u s s e l s 2004 CENELEC - All rights of exploitation in any form and by any means reserved worl
9、dwide for CENELEC members.Ref. No. EN 60825-2:2004 EICS 31.260 ; 33.180.01 English version Safety of laser products Part 2: Safety of optical fibre communication systems (OFCS) (IEC 60825-2:2004)Scurit des appareils laserPartie 2: Scurit des systmes de tlcommunication par fibres optiques (STFO) (CEI
10、 60825-2:2004)Sicherheit von Lasereinrichtungen Teil 2: Sicherheit von Lichtwellenleiter-Kommunikationssystemen (LWLKS) (IEC 60825-2:2004)This European Standard was approved by CENELEC on 2004-09-01. CENELEC members are bound tocomply with the CEN/CENELEC Internal Regulations which stipulate the con
11、ditions for giving this EuropeanStandard the status of a national standard without any alteration. Up-to-date lists and bibliographical references concerning such national standards may be obtained onapplication to the Central Secretariat or to any CENELEC member. T h i s E u r o p e a n S t a n d a
12、 r d e x i s t s i n t h r e e o f f i c i a l v e r s i o n s ( E n g l i s h , F r e n c h , G e r m a n ) . A v e r s i o n i n a n y o t h e rlanguage made by translation under the responsibility of a CENELEC member into its own language andnotified to the Central Secretariat has the same status
13、 as the official versions. CENELEC members are the national electrotechnical committees of Austria, Belgium, Cyprus, CzechRepublic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Slova
14、kia, Slovenia, Spain, Sweden, Switzerland and United Kingdom. 2010Foreword The text of document 76/288/FDIS, future edition 3 of IEC 60825-2, prepared by IEC TC76, Opticalradiation safety and laser equipment, was submitted to the IEC-CENELEC parallel vote and wasapproved by CENELEC as EN 60825-2 on
15、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 classificationsystem introduced in amendment A2:2001 to EN 60825-1:1994. Additionally, the standard has
16、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 conflictingwith the EN have to be wi
17、thdrawn (dow) 2007-09-01 Annex ZA has been added by CENELEC. _ Endorsement noticeThe text of the International Standard IEC 60825-2:2004 was approved by CENELEC as a EuropeanStandard without any modification. _ Foreword to amendment A1The text of document 76/346/FDIS, future amendment 1 to IEC 60825
18、-2:2004, prepared by IEC TC76,Optical radiation safety and laser equipment, was submitted to the IEC-CENELEC parallel vote and wasapproved by CENELEC as amendment A1 to EN 60825-2:2004 on 2007-02-01. The following dates were fixed: latest date by which the amendment has to beimplemented at national
19、level by publication ofan identical national standard or by endorsement (dop) 2007-11-01 latest date by which the national standards conflictingwith the amendment have to be withdrawn (dow) 2010-02-01 _ Endorsement noticeThe text of amendment 1:2006 to the International Standard IEC60825-2:2004 was
20、approved byCENELEC as an amendment to the European Standard without any modification._ BS EN 60825-2:2004+A2:2010EN 60825-2:2004+A2:2010 (E)Page 2Foreword to amendment A2The text of document 76/409/CDV, future amendment 2 to IEC 60825-2:2004, prepared by IEC TC 76, Optical radiation safety and laser
21、 equipment, was submitted to the IEC-CENELEC parallel vote and was approved by CENELEC as amendment A2 to EN 60825-2:2004 on 2010-10-01. Attention is drawn to the possibility that some of the elements of this document may be the subject of patent rights. CEN and CENELEC shall not be held responsible
22、 for identifying any or all such patent rights. The following dates were fixed: latest date by which the amendment has to be implemented at national level by publication of an identical national standard or by endorsement (dop) 2011-07-01 latest date by which the national standards conflicting with
23、the amendment have to be withdrawn (dow) 2013-10-01 _ Endorsement notice The text of amendment 2:2010 to the International Standard IEC 60825-2:2004 was approved by CENELEC as an amendment to the European Standard without any modification. _ BS EN 60825-2:2004+A2:2010EN 60825-2:2004+A2:2010 (E)Page
24、3CONTENTS1 Scope and object72 Normative references.8 3 Terms and definitions.8 4 Requirements11 4.1 General.11 4.2 Protective housing of OFCS.11 4.3 Fibre cables.12 4.4 Cable connectors12 4.5 Automatic power reduction (APR) and restart pulses12 4.6 Labelling or marking.14 4.7 Organizational requirem
25、ents19 4.8 Assessment of hazard level.20 4.9 Hazard level requirementsby location type21 Annex A (informative) Rationale22 Annex B (informative) Summary of requirements atlocations inOFCS.23 Annex C (informative) Methodsof hazard/safety analysis24 Annex D (informative) Application notes for the safe
26、 use of OFCS.25 Annex E (informative) Guidance for service and maintenance49 Annex F (informative) Clarification ofthe meaning of “hazard level”.52 Annex ZA (normative) Normativereferencestointernational publications withtheircorresponding European publications54Bibliography.55 Figure D.1 PON (passi
27、ve optical network)-based system35 Figure D.2 Simple laser drive circuit.37 Figure D.3 Risk graph example from IEC 61508-5 Clause D.5.40 Figure D.4 Graph of FIT rateand mean time to repair.43 Table 1 Marking in unrestricted locations15 Table 2 Marking in Restricted Locations.16 Table 3 Marking in co
28、ntrolled locations.17 Table D.1 OFCS powerlimitsfor 11 m single mode (SM)fibres and 0,18 numerical aperturemultimode (MM) fibres(core diameter 1 400 nm NOTE 2 In the latter case for wavelengths 1 400 nm, for the vast majority of cases this condition will measure all the emission from the fibre, and
29、will therefore account for any level of magnification. NOTE 3 An alternative to the latter condition for wavelengths 1 400 nm is simply to measure the total emission from the fibre while recognising that in certain cases this may result in an over estimate of the actual hazard. NOTE 4 For HL 3B syst
30、ems the total emission from the fibre shall be limited to be less than the AEL of class 3B (thus effectively capping the optical power in the fibre at 500 mW for exposures in excess of 0,25 s, and at the appropriate level for shorter exposures including e.g. system restart pulses). #$1#$Page 27BS EN
31、 60825-2:2004+A2:2010EN 60825-2:2004+A2:2010 (E)Table D.1 OFCS power limits for 11 m single mode (SM)fibresand 0,18numericalaperture multimode(MM)fibres (core diameter 150 m) NOTE 1 Hazard Levels 1M and 2MThe maximum power shown in the table for 11 microns fibre is limited by the power density. The
32、precise fibrepower limit is therefore determined by the minimum expected beam divergence, which is in turn dependent onthe single mode fibre mode field diameter (MFD). This may change for different valuesof the MFD and there are significant changes in Class limitsas theMFD changes. Some high power c
33、onnectors use enlarged mode field diameter (MFD) and the far field divergence is lower. These connectors can result in a higher hazard leveland determination of the hazard level when using these connectors is stronglyrecommended. NOTE 2 1 310 nm figuresThe 1 310 nm figures are calculated for 1 270 n
34、m, which is the shortest wavelength in the “1 310 nm“ telecommunications window. NOTE 3 Fibre parametersThe fibre parameters used are the most conservative cases; single mode figures are calculated for a fibre of 11microns mode field diameter, and multimode figures for a fibre with a numerical apert
35、ure of 0,18. Many systems operating at 980 nm and 1 550 nm use fibres with smaller MFDs. For example, the limit for hazardlevel 1M when a wavelength of 1 550 nm is transmitted along dispersion shifted fibre cables having upper limitvalues of MFD of 9,1 m is 197 mW. NOTE 4 Hazard level 1M limits for
36、1 310 nmThe hazard level 1Mlimits for single mode fibres at 900 nm and below are not presented here, as thedivergence that these wavelengths will undergo is rather variable. This is because these wavelengthsare infact multimoded in standard1 310 nmsingle mode fibre, and the exact divergence will dep
37、end on the rather unpredictable degree of mode mixing. This mode mixing variability is also a potential problem when trying toevaluate these wavelengths on true multimode fibre. Ifit is necessary to calculate a value for these cases, theassumption that the fibre carries all of its power in the funda
38、mental mode and use of the single mode equations will yield a conservative value.NOTE 5 Multimode fibres with core diameters above 150 m These fibreshave to be considered as intermediate extended sources (e.g. hard clad silica (HCS) fibres with 200 m or plastic optical fibres with 1000 m core diamet
39、er). The applicable source size may depend on thedegree of mode filling and should be determined in detail before calculating the limit values. NOTE 6 Hazard level 2 limitsIt canbe shown, that for apparent source sizes smaller than 33 mrad (mostcases in fibre communication techniques) the hazard lev
40、el 2 limits are always lower than the appropriate hazard level 1M limits: Safe for the unaided eye, but potentially unsafe when using opticalinstruments. NOTE 7 Multiple fibres and ribbon cablesThe limits in the table are calculated for single fibres only. If multiple fibres or ribbon fibres with si
41、ngle fibreslocated in close proximity to each other have to be assessed, each individual fibre and each possible groupingof the fibres has to be evaluated. NOTE 8 1 420 nm figureThe 1 420 nm figure is calculated for the 1420 nm to 1 500 nm Raman range. Hazard Level Wavelength and fibre type 1 1M 2 2
42、M 3R 3B 633 nm (MM) 1,95 mW (+3 dBm) 3,9 mW (+5,9 dBm) 4,99 mW (+7 dBm) 10 mW (+10 dBm) 24,9 mW (+14 dBm) 500 mW 780 nm (MM) 2,81 mW (+4,5 dBm) 5,6 mW (+7,5 dBm) 14,4 mW (+11,6 dBm) 500 mW 850 nm (MM) 3,88 mW (+5,9 dBm) 7,8 mW (+8,9 dBm) 19,9 mW (+13 dBm) 500 mW 980 nm (MM) 7,06 mW (+8,5 dBm) 14,1 m
43、W (+11,5 dBm) 36,2 mW (+15,6 dBm) 500 mW 980 nm (SM) 1,8 mW (+2,6 dBm) 2,66 mW (+4,2 dBm) 9,21 mW (+9,6 dBm) 500 mW 1310 nm (MM) 77,8 mW (+18,9 dBm) 156 mW (+21,9 dBm) 399 mW (+26 dBm) 500 mW 1310 nm (SM) 25,8 mW (+14,1 dBm) 42,8 mW (+16,3 dBm) 129 mW (+21,1 dBm) 500 mW 1 400 nm 1 600 nm (MM) 13,3 m
44、W (+11,2 dBm) 384 mW (+25,8 dBm) See note to 3.9 500 mW 1 420 nm (SM) 10,1 mW (+10 dBm) 115 mW (+20,6 dBm) - See note to 3.9 500 mW 1 550 nm (SM) 10,2 mW (+10,1 dBm) 136 mW (+21,3 dBm) See note to 3.9 500 mW #$Text deleted# $NOTE 9 Multimode fibres with core diameters between 52,5 m and 150 m.The fibres can (optionally) be evaluated using the measurement criteria specified in 9.3.3 of IEC 60825-1,whichmay result in a higher allowable power limit.#$Page 28BS EN 60825-2:2004+A2:2010EN 60825-2:2004+A2:2010 (E)
