Abstract
The authors consider the design requirements for 1.52 μm coherent optical fibre transmission systems. Some of the essential requirements are: narrow linewidth sources, polarisation stable transmission media, low insertion loss optical mixers and frequency tracking or phase locked local oscillators. Having been successful in reducing the linewidth of semiconductor lasers to less than 30 kHz, by using injection locking techniques, and in fabricating optical mixers with insertion losses of the order of dB, they have been able to experiment with coherent optical fibre transmission systems to assess their practicability. In this paper it will be shown that coherent systems can be operated over long lengths of conventional low loss monomode fibre without any polarisation penalty and give far better performance than direct detection systems.
Analyse
Les auteurs étudient la conception de systèmes caractérisés par des services à largeur de raie étroite (moins de 30 kHz), un milieu de transmission stable en polarisation, des mélangeurs optiques à faible affaiblissement d’insertion (moins de 1 dB), des oscillateurs locaux à poursuite de fréquence ou à verrouillage de phase.
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Hodgkinson, T.G., Wyatt, R., Malyon, D.J. et al. Experimental 1.5 μm coherent optical fibre transmission systems. Ann. Télécommun. 38, 73–81 (1983). https://doi.org/10.1007/BF02996061
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DOI: https://doi.org/10.1007/BF02996061
Key words
- Optical communication
- Optical fibre
- Digital transmission
- Coherent detection
- Experimental study
- Homodyne detection
- Heterodyne detection