1、raising standards worldwideNO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAWBSI Standards PublicationOptical circuit boardsPart 2-1: Measurements Optical attenuation and isolationBS EN 62496-2-1:2011National forewordThis British Standard is the UK implementation of EN 62496-2-1:
2、2011. It is identical to IEC 62496-2-1:2011.The UK participation in its preparation was entrusted to Technical Committee GEL/86, Fibre optics.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 necessa
3、ry provisions of a contract. Users are responsible for its correct application. BSI 2011ISBN 978 0 580 60949 7 ICS 33.180.01 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 C
4、ommittee on 31 October 2011.Amendments issued since publicationAmd. No. Date Text affectedBRITISH STANDARDBS EN 62496-2-1:2011EUROPEAN STANDARD EN 62496-2-1 NORME EUROPENNE EUROPISCHE NORM September 2011 CENELEC European Committee for Electrotechnical Standardization Comit Europen de Normalisation E
5、lectrotechnique Europisches Komitee fr Elektrotechnische Normung Management Centre: Avenue Marnix 17, B - 1000 Brussels 2011 CENELEC - All rights of exploitation in any form and by any means reserved worldwide for CENELEC members. Ref. No. EN 62496-2-1:2011 E ICS 33.180.01 English version Optical ci
6、rcuit boards - Part 2-1: Measurements - Optical attenuation and isolation (IEC 62496-2-1:2011) Cartes circuits optiques - Partie 2-1: Mesures - Affaiblissement et isolation optiques (CEI 62496-2-1:2011) Optische Leiterplatten - Teil 2-1: Messungen - Optische Dmpfung und Isolation (IEC 62496-2-1:2011
7、) This European Standard was approved by CENELEC on 2011-09-01. 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 bibliographica
8、l 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 CE
9、NELEC 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, Croatia, Cyprus, the Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece
10、, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, the Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and the United Kingdom. BS EN 62496-2-1:2011EN 62496-2-1:2011 - 2 - Foreword The text of document (86/396/FDIS), future edition
11、 1 of IEC 62496-2-1, prepared by IEC TC 86, “Fibre optics“ was submitted to the IEC-CENELEC parallel vote and approved by CENELEC as EN 62496-2-1:2011. The following dates are fixed: latest date by which the document has to be implemented at national level by publication of an identical national sta
12、ndard or by endorsement (dop) 2012-06-01 latest date by which the national standards conflicting with the document have to be withdrawn (dow) 2014-09-01 Attention is drawn to the possibility that some of the elements of this document may be the subject of patent rights. CENELEC and/or CEN shall not
13、be held responsible for identifying any or all such patent rights. Endorsement notice The text of the International Standard IEC 62496-2-1:2011 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
14、 the standards indicated: IEC 60793-1-1 NOTE Harmonized as EN 60793-1-1. IEC 60794-1-1 NOTE Harmonized as EN 60794-1-1. IEC 61280-4-1 NOTE Harmonized as EN 61280-4-1. IEC 61300-3-35 NOTE Harmonized as EN 61300-3-35. BS EN 62496-2-1:2011- 3 - EN 62496-2-1:2011 Annex ZA (normative) Normative reference
15、s 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 (inclu
16、ding any amendments) applies. NOTE When an international publication has been modified by common modifications, indicated by (mod), the relevant EN/HD applies. Publication Year Title EN/HD Year IEC 60793-2-10 - Optical fibres - Part 2-10: Product specifications - Sectional specification for category
17、 A1 multimode fibresEN 60793-2-10 - IEC 60793-2-50 - Optical fibres - Part 2-50: Product specifications - Sectional specification for class B single-mode fibres EN 60793-2-50 - IEC 60825-1 - Safety of laser products - Part 1: Equipment classification and requirements EN 60825-1 - IEC 61300-1 - Fibre
18、 optic interconnecting devices and passive components - Basic test and measurement procedures - Part 1: General and guidance EN 61300-1 - IEC 61300-3-1 2005 Fibre optic interconnecting devices and passive components - Basic test and measurement procedures - Part 3-1: Examinations and measurements -
19、Visual examination EN 61300-3-1 2005 IEC 61300-3-4 - Fibre optic interconnecting devices and passive components - Basic test and measurement procedures - Part 3-4: Examinations and measurements - Attenuation EN 61300-3-4 - IEC 62496-1 2008 Optical circuit boards - Part 1: General EN 62496-1 2009 IEC
20、 62614 - Fibre optics - Launch condition requirements for measuring multimode attenuation EN 62614 - ISO 3599 - Vernier callipers reading to 0,1 and 0,05 mm - - ISO 6906 - Vernier callipers reading to 0,02 mm - - BS EN 62496-2-1:2011 2 62496-2-1 IEC:2011 CONTENTS 1 Scope . 6 2 Normative references .
21、 6 3 Precautions 6 4 Apparatus . 7 4.1 Launch conditions and source (S) . 7 4.2 Power-meter (D) 7 4.3 Optical fibre (OF) 8 4.4 Mode filter (MF) . 8 4.5 Optical direction changing device (OD) 9 4.6 Temporary joint (TJ) 9 5 Procedure 10 5.1 Pre-conditioning 10 5.2 Visual inspection . 11 5.3 Connectivi
22、ty inspection 11 5.4 OCB configurations and measurement methods 11 5.5 Attenuation measurement with a power-meter . 13 5.5.1 General . 13 5.5.2 Cut-back method . 13 5.5.3 Insertion method (A) 15 5.5.4 Insertion method (B) 23 5.6 Isolation measurement with a power-meter 25 5.6.1 Insertion method (C)
23、26 5.6.2 Insertion method (D) 31 5.7 Mirror loss measurement . 32 6 Details to be specified 33 Bibliography 34 Figure 1 Launch apparatus for butt-joint connection, (a) without OD, (b) with OD 10 Figure 2 Cut-back method Configuration A 14 Figure 3 Cut-back method Configuration B 15 Figure 4 Insertio
24、n method (A) Configuration A 16 Figure 5 Insertion method (A), multi port sequential measurements Configuration A 17 Figure 6 Insertion method (A) Configuration B 18 Figure 7 Insertion method (A) Configuration C-1 . 19 Figure 8 Insertion method (A) Configuration C-2 . 20 Figure 9 Insertion method (A
25、) Configuration D 21 Figure 10 Insertion method (A) Configuration E . 22 Figure 11 Insertion method (A) Configuration E . 23 Figure 12 Insertion method (B) Configuration A . 24 Figure 13 Insertion method (B) Configuration C-1 . 25 Figure 14 Insertion method (C) Configuration A 26 Figure 15 Insertion
26、 method (C) Configuration B 27 Figure 16 Insertion method (C) Configuration C-1 . 28 BS EN 62496-2-1:201162496-2-1 IEC:2011 3 Figure 17 Insertion method (C) Configuration D 29 Figure 18 Insertion method (C) Configuration E 30 Figure 19 Insertion method (C) Configuration E 31 Figure 20 Insertion meth
27、od (D) Configuration A 32 Figure 21 Mirror loss measurement 33 Table 1 Preferred source and launch conditions . 7 Table 2 Preferred launching and receiving fibres . 8 Table 3 Measurement methods of attenuations 11 Table 4 Measurement methods of isolations 12 BS EN 62496-2-1:2011 6 62496-2-1 IEC:2011
28、 OPTICAL CIRCUIT BOARDS Part 2-1: Measurements Optical attenuation and isolation 1 Scope IEC 62496-2-1 describes the various methods to measure the optical attenuation and isolation of optical circuit boards (OCBs). 2 Normative references The following referenced documents are indispensable for the
29、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. IEC 60793-2-10, Optical fibres - Part 2-10: Product specifications - Sectional specification for category A1 m
30、ultimode fibres IEC 60793-2-50, Optical fibres - Part 2-50: Product specifications - Sectional specification for class B single-mode fibres IEC 60825-1, Safety of laser products Part 1: Equipment classification and requirements IEC 61300-1, Fibre optic interconnecting devices and passive components
31、Basic test and measurement procedures Part 1: General and guidance IEC 61300-3-1:2003, Fibre optic interconnecting devices and passive components Basic test and measurement procedures Part 3-1: Examinations and measurements Visual examination IEC 61300-3-4, Fibre optic interconnecting devices and pa
32、ssive components Basic test and measurement procedures Part 3-4: Examinations and measurements Attenuation IEC 62496-1:2008, Optical circuit boards Part 1: General IEC 62614, Fibre optics Launch condition requirements for measuring multimode attenuation ISO 3599, Vernier callipers reading to 0,1 and
33、 0,05 mm ISO 6906, Vernier callipers reading to 0,02 mm 3 Precautions The requirements of IEC 60825-1 and the following test requirements shall be met. The position of the fibres in the test should be fixed during the measurement to avoid changes in attenuation caused by bending loss. BS EN 62496-2-
34、1:201162496-2-1 IEC:2011 7 4 Apparatus 4.1 Launch conditions and source (S) For multimode measurements, a restricted launch, not an overfilled launch, shall be used. Encircled flux, which is given in IEC 62614, shall be available for the purposes of launching fibre qualification in case of a 50 or 6
35、2,5 graded index launch fibre. The required launch conditions can be achieved by including appropriate equipment inside the light source, or by applying mode filters on or in series with the launch cord. For single-mode measurements, the launch condition shall be in accordance with Annex B of IEC 61
36、300-1. The source unit consists of an optical emitter, the associated drive electronics and fibre pigtail. Preferred source and launch conditions are given in Table 1. Table 1 Preferred source and launch conditions No. Type Centre wavelength nm Spectral width nm Stability at 23 oC dB/h Output power
37、Launch conditions Source type S1 Multimode 660 30 30 0,05 aTBD Laser diode or LED S2 Multimode 780 30 30 0,05 aTBD Laser diode or LED S3 Multimode 850 30 30 0,05 aIEC 62614 Laser diode or LED S4 Multimode 980 30 30 0,05 aTBD Laser diode or LED S5 Multimode 1 300 30 30 0,05 aIEC 62614 Laser diode or
38、LED S6 Single-mode 1 310 30 10 0,05 aIEC 61300-1, Annex B.2.2 Laser diode or LED S7 Single-mode 1 550 30 10 0,05 aIEC 61300-1, Annex B.2.2 Laser diode or LED a The source output power shall be 20 dB above the minimum measured power level. NOTE 1 Due to their long coherence length, laser source units
39、 create a speckle pattern across the core of a multimode fibre that is unstable and which may render difficult or impossible the task of creating case 2 launch conditions in a multimode component. Consequently, for measuring multimode components, lasers, should be avoided in favour of LEDs or other
40、incoherent source units. NOTE 2 For S5 and S6, where an LED is used, the spectral width is more typically 150 nm. NOTE 3 It is recognized that new components may require the use of other source types such as tunable lasers. It is therefore recommended in these cases that the preferred source charact
41、eristics be specified on the basis of the component to be measured. 4.2 Power-meter (D) The power-meter unit consists of an optical detector, the mechanism for connecting to it and associated detection electronics. The connection between the detector and a receiving fibre will either be with an adap
42、tor that accepts a bare fibre or a connector plug of appropriate design. The measurement system shall be stable within specified limits over the period of time required to measure an optical power. For measurements where the connection to the detector must be broken between the measurement of the op
43、tical power, the measurement BS EN 62496-2-1:2011 8 62496-2-1 IEC:2011 repeatability shall be within 0,05 dB. A detector with a large sensitive area may be used to achieve this requirement. The precise characteristics of the detector shall be compatible with the measurement requirements. The dynamic
44、 range of the power-meter shall be capable of measuring the power level exiting from the OCB at the wavelength being measured. The preferred dynamic range is from 40 dBm to -75 dBm. 4.3 Optical fibre (OF) Optical fibres used for optical measurements shall meet the requirement of all categories of cl
45、ass A fibres (multimode) given in IEC 60793-2-10, or class B fibres (single-mode) given in IEC 60793-2-50. The preferred launching and receiving fibres are given in Table 2. To measure an OCB consisting of a multimode waveguide, the launching fibre core diameter should preferably be the same as the
46、core inner diameter of the OCB or less, and the numerical aperture (NA), which is the sine of the acceptance angle of a waveguide or fibre, should be smaller than that of OCB. In this case, the most reproduceable attenuation value could be obtained. When using a launch fibre with a much smaller core
47、 diameter than that of the OCB, such as a single-mode fibre, it is likely that a lower attenuation value will be obtained. The NA of a single-mode fibre is much lower than the NA of the multimode OCB such that the launch beam is less affected by the roughness of the core wall. When measuring an OCB
48、that employs optical fibre, a launching fibre shall be selected that has the same geometrical and optical characteristics as that used in the OCB. Table 2 Preferred launching and receiving fibres OCB medium Launching fibre Receiving fibre Multimode fibre, or Multimode waveguide 50 GI Multimode fibre
49、, 62,5 GI Multimode fibre, or Single-mode fibre Multimode fibre with core diameter that completely circumscribes the OCB output port, and with the same NA as the OCB output port or more or Direct detection by power-meter Single-mode fibre, or Single-mode waveguide Single-mode fibre Multimode fibre, Single-mode fibre or Direct detection by power-meter 4.4 Mode filter (MF)
