Français
1. Signal-to-noise ratio and Q factor
1.1 Signal-to-noise ratio of a WDM (Wavelength Division Multiplexing) link
A submarine link is made up of a cascade of repeaters spaced 50 to 100 km apart, depending on the link; each repeater comprises erbium-doped fiber amplifiers (EDFAs) through which a multitude of wavelengths pass; the quality of the signal transmitted by all these wavelengths must be absolutely the same throughout the transmission multiplex, which means that the gain of each EDFA must be identical for all the wavelengths transmitted. To achieve this spectral homogeneity, it is necessary to insert optical gain equalizing filters at the output of each EDFA, thus guaranteeing a gain distortion of less than 0.2 dB per EDFA in the spectral band used in submarine links, known as the C band (1,533 to 1,567 nm). For...
The Ultimate Scientific and Technical Reference
This article is included in
Networks and Telecommunications
This offer includes:
Knowledge Base
Updated and enriched with articles validated by our scientific committees
Services
A set of exclusive tools to complement the resources
Practical Path
Operational and didactic, to guarantee the acquisition of transversal skills
Doc & Quiz
Interactive articles with quizzes, for constructive reading
Signal-to-noise ratio and Q factor
Parameters affecting transmission quality
Bibliography
Conferences
Proceedings of SubOptic 2001, Kyoto, May 20-24, 2001
Proceedings of SubOptic 2004, Monaco, 29 mars-1 er avril 2004
Proceedings of SubOptic 2007, Baltimore, May 14-17, 2007
Proceedings of SubOptic 2010, Yokohama, May 11-14, 2010
Proceedings of SubOptic 2013, Paris, April 22-25, 2013...
Standards and norms
ITU (International Telecommunication Union) recommendations for fiber optic submarine cables :
- General features of optical fibre submarine cable systems - G971 -
- Definition of terms relevant to optical fiber submarine cable systems - G972 -
- Characteristics of repeaterless optical fiber submarine cable systems - G973 -
- Longitudinally compatible DWDM applications for repeaterless...
The Ultimate Scientific and Technical Reference
