1、BSI Standards PublicationOptical circuit boards Basic test and measurement proceduresPart 2-4: Optical transmission test for optical circuit boards without input/output fibresBS EN 62496-2-4:2013National forewordThis British Standard is the UK implementation of EN 62496-2-4:2013. It isidentical to I
2、EC 62496-2-4:2013.The UK participation in its preparation was entrusted to TechnicalCommittee GEL/86, Fibre optics.A list of organizations represented on this committee can be obtained onrequest to its secretary.This publication does not purport to include all the necessary provisions ofa contract.
3、Users are responsible for its correct application. The British Standards Institution 2013.Published by BSI Standards Limited 2013ISBN 978 0 580 79740 8ICS 33.180.01Compliance with a British Standard cannot confer immunity fromlegal obligations.This British Standard was published under the authority
4、of theStandards Policy and Strategy Committee on 30 September 2013. Amendments/corrigenda issued since publicationDate Text affectedBRITISH STANDARDBS EN 62496-2-4:2013EUROPEAN STANDARD EN 62496-2-4 NORME EUROPENNE EUROPISCHE NORM August 2013 CENELEC European Committee for Electrotechnical Standardi
5、zation Comit Europen de Normalisation Electrotechnique Europisches Komitee fr Elektrotechnische Normung CEN-CENELEC Management Centre: Avenue Marnix 17, B - 1000 Brussels 2013 CENELEC - All rights of exploitation in any form and by any means reserved worldwide for CENELEC members. Ref. No. EN 62496-
6、2-4:2013 E ICS 33.180.01 English version Optical circuit boards - Basic test and measurement procedures - Part 2-4: Optical transmission test for optical circuit boards without input/output fibres (IEC 62496-2-4:2013) Cartes circuits optiques - Procdures fondamentales dessais et de mesures - Partie
7、2-4: Essai de transmission optique des cartes circuits optiques sans fibres dentre/sortie (CEI 62496-2-4:2013) Optische Leiterplatten - Grundlegende Prf- und Messverfahren - Teil 2-4: Optische bertragungsprfung fr optische Leiterplatten ohne Eingangs-/Ausgangsfasern (IEC 62496-2-4:2013) This Europea
8、n Standard was approved by CENELEC on 2013-07-23. 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 c
9、oncerning such national standards may be obtained on application to the CEN-CENELEC Management Centre 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 CENELE
10、C member into its own language and notified to the CEN-CENELEC Management Centre 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, Former Yugoslav R
11、epublic of Macedonia, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, the Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and the United Kingdom. BS EN 62496-2-4:2013EN 62496-2-4:2013 - 2 - Forewo
12、rd The text of document 86/449/FDIS, future edition 1 of IEC 62496-2-4, prepared by IEC TC 86 “Fibre optics“ was submitted to the IEC-CENELEC parallel vote and approved by CENELEC as EN 62496-2-4:2013. The following dates are fixed: latest date by which the document has to be implemented at national
13、 level by publication of an identical national standard or by endorsement (dop) 2014-04-23 latest date by which the national standards conflicting with the document have to be withdrawn (dow) 2016-07-23 Attention is drawn to the possibility that some of the elements of this document may be the subje
14、ct of patent rights. CENELEC and/or CEN shall not be held responsible for identifying any or all such patent rights. Endorsement notice The text of the International Standard IEC 62496-2-4:2013 was approved by CENELEC as a European Standard without any modification. In the official version, for Bibl
15、iography, the following notes have to be added for the standards indicated: IEC 62496-2-1 NOTE Harmonised as EN 62496-2-1. IEC 60793-2 NOTE Harmonised as EN 60793-2. IEC 62496 NOTE Harmonised in EN 62496 series (not modified). BS EN 62496-2-4:2013- 3 - EN 62496-2-4:2013 Annex ZA (normative) Normativ
16、e references to international publications with their corresponding European publications The following documents, in whole or in part, are normatively referenced in this document and are indispensable for its application. For dated references, only the edition cited applies. For undated references,
17、 the latest edition of the referenced document (including 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 60068-1 - Environmental testing - Part 1: General
18、 and guidance EN 60068-1- BS EN 62496-2-4:2013 2 62496-2-4 IEC:2013 CONTENTS 1 Scope . 6 2 Normative references . 6 3 Terms, definitions and abbreviations 6 3.1 Terms and definitions 6 3.2 Abbreviations 7 4 Measurement conditions . 7 5 Inspection methods 8 5.1 Equipment . 8 5.1.1 Light source system
19、 . 9 5.1.2 Observation system . 10 5.1.3 Data processing unit 11 5.1.4 Unit for holding the sample 12 5.2 Measurement procedures of relative optical loss . 12 5.2.1 Preparation of light source . 12 5.2.2 Preparation of the optical observation system measuring equipment . 13 5.2.3 Measuring coordinat
20、es of I/O ports 13 5.2.4 Capturing of optical images for control sample and samples to be measured 13 5.2.5 Image data processing (detection of I/O port range) 14 5.2.6 Calculation of relative loss . 14 5.3 Evaluation of pass or fail . 15 Annex A (informative) Example of an optical transmission test
21、 for an OCB without I/O fibres 16 Annex B (informative) Measurement of input and output ports in offset positions 19 Bibliography 21 Figure 1 Optical transmission test system without I/O fibres for surface I/O type OCB . 8 Figure 2 Optical transmission test system without I/O fibres for end-face I/O
22、 type OCB . 9 Figure 3 Schematic diagram of measurement of uniformity of illumination area 10 Figure 4 Example of obtained uniformity of illumination area 10 Figure 5 Example of obtained sensitivity of an image sensor (input uniformity within 1 %) 11 Figure 6 Position alignment of light source . 13
23、Figure 7 Example of captured image and extracted I/O port range by image binarization . 14 Figure 8 Calculation of the total detected intensity of extracted I/O port range from detected intensity for each pixel 15 Figure A.1 Example of relative optical loss measurement . 17 Figure A.2 Example of rep
24、roducibility of relative optical loss measurement 18 Figure B.1 Ray traces for OCBs with mirror having designated mirror angle (left) and not designated one (right) . 19 Figure B.2 Difference of focus positions between without offset and with offset . 20 Figure B.3 Optical images at surface of OCB p
25、lane (without offset) and offset position (with offset) 20 BS EN 62496-2-4:201362496-2-4 IEC:2013 3 Table A.1 Observation system . 16 Table A.2 Light source . 16 Table A.3 Samples to be measured 16 BS EN 62496-2-4:2013 6 62496-2-4 IEC:2013 OPTICAL CIRCUIT BOARDS BASIC TEST AND MEASUREMENT PROCEDURES
26、 Part 2-4: Optical transmission test for optical circuit boards without input/output fibres 1 Scope This part of IEC 62496 specifies the test method to decide whether to pass or fail an optical circuit board using direct illumination by a light. The input ports are directly illuminated and the optic
27、al intensity from the output ports of the optical circuit board is monitored using an area image sensor. Excess optical losses are the calculated from total detected intensities of light from a sample to be measured and from a control sample. This method is used to illuminate uniformly the input por
28、t of the optical circuit board (OCB) with a larger area than the core area, obtain the radiance of an area image from the corresponding output port of the OCB using an area image sensor, and evaluate whether to pass or fail using the radiance obtained compared to that of a control sample. The advant
29、age of this test method is that the alignment procedure between a launch fibre and the OCB is not necessary. 2 Normative references The following documents, in whole or in part, are normatively referenced in this document and are indispensable for its application. For dated references, only the edit
30、ion cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies. IEC 60068-1, Environmental testing Part 1: General and guidance 3 Terms, definitions and abbreviations 3.1 Terms and definitions For the purposes of this document, the followi
31、ng terms, definitions and abbreviations apply. 3.1.1 shading non-uniformity of detected intensity of an image caused by non-uniformity of the sensitivity of elements of an area image sensor and vignetting depending on the optical system Note 1 to entry: Correction of the non-uniformity of the detect
32、ion sensitivity of elements of a uniform one is called “shading correction“. 3.1.2 gamma value factor “” for a camera expressed by the following equation: (input optical intensity signal) = A (output image signal) where A is a proportionality constant Note 1 to entry: The input optical intensity is
33、linearly proportional to the output image signal when = 1. BS EN 62496-2-4:201362496-2-4 IEC:2013 7 3.1.3 telecentric optical system optical system where the optical input pupil and output pupil are placed at infinitely far positions and the main optical signal is parallel to the optical axis 3.1.4
34、distortion (distortion aberration) type of aberration Note 1 to entry: The optical image is not in proportion to the original target but is distorted. There are two types of distortion: one is the barrel type, where light is distorted outward; the other is the bobbin or pincushion type, where light
35、is distorted inward near the edge of a lens. 3.1.5 area image sensor arrayed photo-detector in two dimensions, which can capture area image at once Note 1 to entry: There are two types of area image sensor: one is the CCD (charge coupled device); the other is the CMOS (complementary metal oxide semi
36、conductor). 3.1.6 control sample sample having optical insertion loss already obtained by measurement procedure specified in IEC 62496-2-1 11Note 1 to entry: The core shape and numerical aperture of the control sample should be same as those of the samples to be measured. 3.1.7 relative optical loss
37、 difference between the total detected intensity obtained from the output port area of the sample to be measured and that for a control sample Note 1 to entry: The unit of relative optical loss is the decibel. 3.2 Abbreviations ACC automatic current control APC automatic power control CCD charged co
38、uple device CMOS complementary metal oxide semiconductor LED light emitting diode NA numerical aperture OCB optical circuit board 4 Measurement conditions All measurements are made under the conditions specified in IEC 60068-1, unless otherwise specified. _ 1Figures in square brackets refer to the B
39、ibliography. BS EN 62496-2-4:2013 8 62496-2-4 IEC:2013 5 Inspection methods 5.1 Equipment The test equipment shall consist of a light source system, an observation system, a sample holder and a data processor (image intake and image processor). The construction illustrated in Figure 1 should be used
40、 to the surface I/O port type OCB. The system illustrated in Figure 2 should be used for end-face I/O type OCB. Movement and adjustment of positions of irradiation for and detecting images from the sample should be carried out by the adjustment mechanisms provided to the light signal illuminator, ob
41、servation optics and sample holder. Key A1 light source system A2 data processing system A3 observation system L1 light source HS unit for holding sample DP data processor p1 stage controller S1 stage c1 camera OC optical circuit board LA uniform light CI captured image Figure 1 Optical transmission
42、 test system without I/O fibres for surface I/O type OCB BS EN 62496-2-4:201362496-2-4 IEC:2013 9 Key A1 light source system A2 data processing system A3 observation system L1 light source HS unit for holding sample DP data processor p1 stage controller S1 stage c1 camera OC optical circuit board LA
43、 uniform light CI captured image Figure 2 Optical transmission test system without I/O fibres for end-face I/O type OCB 5.1.1 Light source system 5.1.1.1 Light source The light source to be used is an incoherent light source, such as an LED, in order to prevent inducing a speckle pattern to the outp
44、ut image pattern to give a large numerical aperture divergent input to ensure fully filled waveguide modes. It is desirable that the light source is equipped with an APC to stabilize the output optical power by signal feedback from an optical power monitor. ACC is substituted for APC if the required
45、 optical stability is attained without use of an APC. 5.1.1.2 Holding and position adjustment of the light source Holding and position adjustment functions of the light source shall be provided to adjust and control the light source position to the light input port of the sample to be measured. 5.1.
46、1.3 Illumination condition An illumination method shall be used that provides uniform light illumination to the optical circuit within a specified illumination intensity range. Ensure numerical aperture (NA) is greater than that of the optical circuit. The uniformity of illumination is confirmed by
47、measuring, using a scanning optical fibre having similar core shape and NA to those of the OCB pointing in the same direction as the waveguide or fibres in the OCB to be measured or by using the OCB to be measured as a probe. A schematic diagram of measurement of uniformity of the illumination area
48、is shown in Figure 3. An example of the measurement result is shown in BS EN 62496-2-4:2013 10 62496-2-4 IEC:2013 Figure 4. The uniformity of the illumination to be used should be sufficient for the required accuracy of the measurement. L1 PM OP IEC 1436/13 Key L1 light source OP optical fibre as a
49、probe PM optical power meter Figure 3 Schematic diagram of measurement of uniformity of illumination area 2,5 mm3,5 mm2,52,01,51,00,50,00,51,01,52,02,52,5 2,0 1,5 1,0 0,5 0,0 0,5 1,0 1,5 2,0 2,5 X (mm) Y (mm)99-100 98-99 97-98 96-97 95-96 IEC 1437/13 NOTE 1 The unit in the legend is in percentage. NOTE 2 The maximum intensity is normalized to 100 %. Figure 4 Example of obtained uniformity of illumination area 5.1.2 Observation system 5.1
