IEC 62496-2-4:2013

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 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 optical 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 port 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 advantage of this test method is that the alignment procedure between a launch fibre and the OCB is not necessary. Key words: test method to decide whether to pass or fail an optical circuit board, OCB, area image sensor

Cartes à circuits optiques - Procédures fondamentales d'essais et de mesures - Partie 2-4: Essai de transmission optique des cartes à circuits optiques sans fibres d'entrée/sortie

La CEI 62496-2-4:2013 spécifie la méthode d'essai utilisée pour déterminer l'acceptation ou le rejet d'une carte à circuits optiques en la soumettant à l'éclairement direct d'une lampe. On soumet les ports d'entrée à un éclairage direct et on surveille l'intensité optique issue des ports de sortie de la carte à circuits optiques à l'aide d'un capteur d'image bidimensionnel. On calcule ensuite les affaiblissements optiques excédentaires à partir de la somme des intensités lumineuses détectées sur un échantillon à mesurer et sur un échantillon témoin. Cette méthode permet d'éclairer uniformément le port d'entrée de la carte à circuits optiques (OCB) sur une surface supérieure à celle du c ur, d'obtenir la luminance de l'image bidimensionnelle issue du port de sortie correspondant de l'OCB à l'aide d'un capteur d'image bidimensionnel, et d'évaluer s'il faut accepter ou rejeter la carte en comparant la luminance obtenue à celle d'un échantillon témoin. Cette méthode d'essai a pour avantage de ne pas nécessiter d'alignement entre une fibre d'injection et l'OCB. Mots clés: essai utilisée pour déterminer l'acceptation ou le rejet d'une carte à circuits optiques, OCB, capteur d'image bidimensionnel

General Information

• Status: Published
• Publication Date: 17-Jun-2013
• ICS: 01 - GENERALITIES. TERMINOLOGY. STANDARDIZATION. DOCUMENTATION
• ICS: 33.180.01 - Fibre optic systems in general
• Technical Committee: TC 86 - Fibre optics
• Drafting Committee: JWG 9 - TC 86/JWG 9
• Current Stage: PPUB - Publication issued
• Start Date: 15-Jul-2013
• Completion Date: 18-Jun-2013

Standards Content (Sample)

IEC 62496-2-4 ®
Edition 1.0 2013-06
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
colour
inside
Optical circuit boards – Basic test and measurement procedures –
Part 2-4: Optical transmission test for optical circuit boards without input/output
fibres
Cartes à circuits optiques – Procédures fondamentales d'essais et de mesures –
Partie 2-4: Essai de transmission optique des cartes à circuits optiques sans
fibres d'entrée/sortie
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IEC 62496-2-4 ®
Edition 1.0 2013-06
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
colour
inside
Optical circuit boards – Basic test and measurement procedures –

Part 2-4: Optical transmission test for optical circuit boards without input/output

fibres
Cartes à circuits optiques – Procédures fondamentales d'essais et de mesures –

Partie 2-4: Essai de transmission optique des cartes à circuits optiques sans

fibres d'entrée/sortie
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
PRICE CODE
INTERNATIONALE
CODE PRIX S
ICS 33.180.01 ISBN 978-2-83220-868-7

– 2 – 62496-2-4 © IEC:2013
CONTENTS
FOREWORD . 4
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 . 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 coordinates 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 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 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
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 reproducibility 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 plane (without offset) and offset
position (with offset). 20

62496-2-4 © IEC:2013 – 3 –
Table A.1 – Observation system . 16
Table A.2 – Light source . 16
Table A.3 – Samples to be measured . 16

– 4 – 62496-2-4 © IEC:2013
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
OPTICAL CIRCUIT BOARDS –
BASIC TEST AND MEASUREMENT PROCEDURES –

Part 2-4: Optical transmission test for optical circuit boards
without input/output fibres
FOREWORD
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