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BS EN IEC 60793-1-40:2019

BS EN IEC 60793-1-40:2019

$167.15

Optical fibres – Attenuation measurement methods

Published By Publication Date Number of Pages
BSI 2019 40
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This part of IEC 60793 establishes uniform requirements for measuring the attenuation of optical fibre, thereby assisting in the inspection of fibres and cables for commercial purposes.

Four methods are described for measuring attenuation, one being that for modelling spectral attenuation:

  • method A: cut-back;

  • method B: insertion loss;

  • method C: backscattering;

  • method D: modelling spectral attenuation.

Methods A to C apply to the measurement of attenuation for all categories of the following fibres:

  • class A multimode fibres;

  • class B single-mode fibres.

Method C, backscattering, also covers the location, losses and characterization of point discontinuities.

Method D is applicable only to class B fibres.

Information common to all four methods appears in Clauses 1 to 11, and information pertaining to each individual method appears in Annexes A, B, C, and D, respectively.

PDF Catalog

PDF Pages PDF Title
2 undefined
5 Annex ZA(normative)Normative references to international publicationswith their corresponding European publications
7 English
CONTENTS
10 FOREWORD
12 1 Scope
2 Normative references
13 3 Terms and definitions
14 4 Calibration requirements
5 Reference test method
6 Apparatus
7 Sampling and specimens
7.1 Specimen length
7.2 Specimen end face
8 Procedure
9 Calculations
9.1 Methods A and B
9.2 Method C
9.3 Method D
10 Results
10.1 Information available with each measurement
15 10.2 Information available upon request
10.3 Method-specific additional information
11 Specification information
16 Annexes
Annex A (normative) Requirements specific to method A – Cut-back
A.1 General
A.2 Apparatus
A.2.1 General apparatus for all fibres
Figure A.1 – Arrangement of equipment for loss measurement ata specified wavelength
17 Figures
Figure A.2 – Arrangement of equipment used to obtain loss spectrum
Figure A.3 – General launch arrangement
18 A.2.2 Launch apparatus for all single-mode fibres
19 A.2.3 Launch apparatus for A1 multimode fibres
20 Figure A.4 – Limited phase space launch optics
Tables
Table A.1 – Size examples
21 A.2.4 Launch apparatus for A2 to A4 multimode fibres
Figure A.5 – Two examples of optical fibre scramblers
Figure A.6 – Lens system
Table A.2 – Launch conditions for A2 to A4 fibres
22 A.2.5 Calibration requirements
Figure A.7 – Launch fibre
Figure A.8 – Mode scrambler (for A.4 fibre)
23 A.3 Procedure
A.4 Calculations
Figure A.9 – A wide-spectrum source (line “b”) could lead to attenuation measurement errors due to sharp variations on spectral attenuation of polymer-core fibres (line “a”)
24 Annex B (normative) Requirements specific to method B – Insertion loss
B.1 General
B.2 Apparatus
B.2.1 General set-ups
B.2.2 Apparatus common to method A (cut-back)
B.2.3 Additional apparatus specific to method B (insertion-loss)
B.2.4 Calibration requirements
B.3 Procedure
25 B.4 Calculations
Figure B.1 – Calibration of insertion loss measurement set
Figure B.2 – Measurement of insertion loss
26 Annex C (normative) Requirements specific to method C – Backscattering
C.1 General
C.2 Apparatus
C.2.1 General
Figure C.1 – Block diagram of an OTDR
27 C.2.2 Optical transmitter
C.2.3 Launch conditions
C.2.4 Optical splitter
C.2.5 Optical receiver
C.2.6 Pulse duration and repetition rate
C.2.7 Signal processor
28 C.2.8 Display
C.2.9 Data interface (optional)
C.2.10 Reflection controller (optional)
C.2.11 Splices and connectors
C.3 Sampling and specimens
C.4 Procedure
C.4.1 General
29 Figure C.2 – Schematic OTDR trace for a “uniform” specimen preceded by a dead-zone fibre
Figure C.3 – Schematic OTDR trace for a “uniform” specimen not preceded by a dead-zone fibre
30 C.4.2 Further steps for measuring attenuation
C.4.3 Further steps for measuring point discontinuities
31 Figure C.4 – Schematic OTDR trace showing apparent loss due to point discontinuities, one reflective and one non-reflective
Figure C.5 – Schematic of an expanded OTDR trace showing two point discontinuities, one with apparent gain, and another with no apparent loss or gain
32 C.4.4 Calibration
C.5 Calculations
C.6 Results
33 Annex D (normative) Requirements specific to method D – Spectral attenuation modelling
D.1 General
D.2 Apparatus
D.3 Sampling and specimens
D.4 Procedure
34 D.5 Calculations
D.6 Results
36 Annex E (informative) Examples of short cable test results on A1 multimode fibres
Figure E.1 – Example of attenuation coefficient tests on A1a.1 fibre
Figure E.2 – Example of attenuation coefficient tests on A1a.3 fibre
37 Figure E.3 – Example of attenuation coefficient tests on A1b fibre
38 Bibliography

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BS EN IEC 60793-1-40:2019
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