IEC TR 62285:2023

IEC TR 62285 ®
Edition 3.0 2023-10
REDLINE VERSION
TECHNICAL
REPORT
colour
inside
Application guidelines for nonlinear coefficient measuring methods
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IEC TR 62285 ®
Edition 3.0 2023-10
REDLINE VERSION
TECHNICAL
REPORT
colour
inside
Application guidelines for nonlinear coefficient measuring methods
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
ICS 33.180.10  ISBN 978-2-8322-7769-0
– 2 – IEC TR 62285:2023 RLV © IEC 2023
CONTENTS
FOREWORD . 4
1 Scope . 6
2 Normative references . 6
3 Terms and definitions . 6
4 Abbreviated terms and symbols . 7
4.1 Abbreviated terms . 7
4.2 Symbols . 7
5 Background and overview of methods . 7
6 Apparatus . 8
6.1 General . 8
6.2 Light source . 8
6.3 Input optics . 8
6.4 Input positioner . 8
6.5 Cladding mode stripper . 9
6.6 Output positioner . 9
6.7 Output optics . 9
6.8 Computer . 9
7 Samples and specimens . 9
8 Procedure . 9
9 Calculations of interpretation of results . 10
10 Documentation Results . 11
10.1 Information to be provided available with each measurement . 11
10.2 Information available upon request . 11
Annex A (normative) Continuous wave dual-frequency method . 12
A.1 Introduction General . 12
A.2 Apparatus . 13
A.2.1 Layout of apparatus . 13
A.2.2 Sources . 13
A.2.3 Optical signal conditioning . 13
A.2.4 Power meters . 14
A.2.5 Optical spectrum analyser . 14
A.3 Samples and specimens . 14
A.4 Procedure . 15
A.4.1 General . 15
A.4.2 Calibration . 15
A.4.3 Operation . 15
A.5 Calculations . 16
A.5.1 Calculate phase values . 16
A.5.2 Confirm assumptions . 16
A.5.3 Complete the calculation . 16
Annex B (normative) Pulsed single-frequency method (PM) . 18
B.1 Introduction General . 18
B.2 Apparatus . 18
B.2.1 Layout of apparatus . 18
B.2.2 Source . 18
B.2.3 Optical signal conditioning . 18

B.2.4 Power meters . 19
B.2.5 Optical pulsewidth measurement . 19
B.2.6 Optical spectrum analyser . 19
B.3 Samples and specimens . 19
B.4 Procedure . 20
B.5 Calculations . 20
B.5.1 Peak power . 20
B.5.2 Phase shift . 20
B.5.3 Complete the calculations . 20
Annex C (informative) List of acronyms and symbols .
Annex C (informative) Guidance on the selection of fibre test length, power and
difference in optical wavelength when using method A . 23
Bibliography . 24

Figure A.1 – Output spectral characteristics . 12
Figure A.2 – Apparatus for method A . 13
Figure A.3 – Relationship of phase to intensity ratio. 16
Figure A.4 – Relationship of phase to power . 17
Figure B.1 – Test set-up for method B . 18
Figure B.2 – Output spectra . 19
Figure B.3 – Phase vs. peak input power for method B . 21

Table C.1 – Fibre characteristics for method A (representative values) . 23

– 4 – IEC TR 62285:2023 RLV © IEC 2023
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
APPLICATION GUIDELINES FOR NONLINEAR
COEFFICIENT MEASURING METHODS
FOREWORD
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