1 Scope
2 References
2.1 Normative references
2.2 Informative references
3 Terms and definitions
3.1 Definitions
3.2 Terms defined in other Recommendations
4 Abbreviations
5 Optical monitoring overview
6 Classification of monitoring methods
6.1 Signal monitoring
6.2 Equipment monitoring (indirect methods)
6.3 Embedded monitoring equipment
6.4 External monitoring equipment
7 Optical impairments
8 Optical monitoring parameters
9 Correlation between impairment effects and optical monitoring
parameters degradation
9.1 Variation of attenuation
9.2 Frequency (or wavelength) deviation from nominal
9.3 Optical channel power changes due to gain variations
10 Applications
11 Optical safety considerations
Appendix I – Severity of optical
impairments
Appendix II – Penalty severity value X
Appendix III – Optical monitoring
performance
III.1 OSNR measurement
III.2 Q-factor measurement