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BS EN IEC 61280-2-8:2021

BS EN IEC 61280-2-8:2021

$167.15

Fibre optic communication subsystem test procedures – Digital systems. Determination of low BER using Q-factor measurements

Published By Publication Date Number of Pages
BSI 2021 36
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IEC 61280-2-8:2021 is available as IEC 61280-2-8:2021 RLV which contains the International Standard and its Redline version, showing all changes of the technical content compared to the previous edition. IEC 61280-2-8:2021 specifies two main methods for the determination of low BER values by making accelerated measurements. These include the variable decision threshold method (Clause 5) and the variable optical threshold method (Clause 6). In addition, a third method, the sinusoidal interference method, is described in Annex B. This second edition cancels and replaces the first edition published in 2003. This edition constitutes a technical revision. This edition includes the following significant technical changes with respect to the previous edition: – correction of errors in Formula (8) in 5.5.2 and in a related formula in 5.5.3; – correction of errors in the references to clauses, subclauses, figures, procedures, and in the Bibliography; – alignment of the terms and definitions in 3.1 with those in IEC 61281-1.

PDF Catalog

PDF Pages PDF Title
2 undefined
4 European foreword
Endorsement notice
5 English
CONTENTS
7 FOREWORD
9 1 Scope
2 Normative references
3 Terms, definitions, and abbreviated terms
3.1 Terms and definitions
10 3.2 Abbreviated terms
4 Measurement of low bit-error ratios
4.1 General considerations
Tables
Table 1 – Mean time for the accumulation of 15 errorsas a function of BER and bit rate
11 4.2 Background to Q-factor
12 Figures
Figure 1 – Sample eye diagram showing patterning effects
13 5 Variable decision threshold method
5.1 Overview
Figure 2 – More accurate measurement technique using a DSO that samples noise statistics between eye centres
14 Figure 3 – Bit error ratio as a function of decision threshold level
15 Figure 4 – Plot of Q-factor as a function of threshold voltage
16 5.2 Apparatus
5.3 Sampling and specimens
5.4 Procedure
17 Figure 5 – Set-up for the variable decision threshold method
Figure 6 – Set-up of initial threshold level (approximately at the centre of the eye)
18 5.5 Calculations and interpretation of results
5.5.1 Sets of data
19 5.5.2 Convert BER using inverse error function
Table 2 – BER as a function of threshold voltage
20 5.5.3 Linear regression
Table 3 – fi as a function of Di
21 5.5.4 Standard deviation and mean
5.5.5 Optimum decision threshold
5.5.6 BER optimum decision threshold
Table 4 – Values of linear regression constants
Table 5 – Mean and standard deviation
22 5.5.7 BER non-optimum decision threshold
5.5.8 Error bound
5.6 Test documentation
5.7 Specification information
6 Variable optical threshold method
6.1 Overview
23 6.2 Apparatus
6.3 Items under test
6.4 Procedure for basic optical link
Figure 7 – Effect of optical bias
24 6.5 Procedure for self-contained system
Figure 8 – Set-up for optical link or device test
Figure 9 – Set-up for system test
25 6.6 Evaluation of results
Table 6 – Example of optical bias test
26 Figure 10 – Extrapolation of log BER as a function of bias
27 Annex A (normative) Calculation of error bound in the value of Q
29 Annex B (informative) Sinusoidal interference method
B.1 Overview
B.2 Apparatus
B.3 Sampling and specimens
30 B.4 Procedure
B.4.1 Optical sinusoidal interference method
Figure B.1 – Set-up for the sinusoidal interference method by optical injection
31 B.4.2 Electrical sinusoidal interference method
Table B.1 – Results for sinusoidal injection
32 B.5 Calculations and interpretation of results
B.5.1 Mathematical analysis
B.5.2 Extrapolation
Figure B.2 – Set-up for the sinusoidal interference method by electrical injection
33 B.5.3 Expected results
Figure B.3 – BER result from the sinusoidal interference method (data points and extrapolated line)
34 B.6 Documentation
B.7 Specification information
Figure B.4 – BER versus optical power for three methods
35 Bibliography

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BS EN IEC 61280-2-8:2021
$167.15