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26 December 1984 Progress In Coherent Optical Fibre Transmission Techniques In The United Kingdom
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The initial reason for investigating coherent optical fibre transmission techniques was to determine if the predicted improvements in receiver sensitivity of between 10 to 20 dB over direct detection (1,2) could be achieved in a laboratory experiment. There had been several areas of doubt about the practicability of coherent detection, in particular the spectral properties of semiconductor laser sources, the polarisation characteristics of the fibre transmission medium, the increased complexity of a coherent transmission system and the extensive engineering development that is necessary. Once the practical problems have been reconciled a future for coherent transmission could be forseen, not just for point-to-point long haul telecommunications, but also for wideband signal distribution in local networks. For this second application the extra sensitivity of coherent detection would largely overcome optical path splitting losses and the selectivity of coherent detection could allow many thousands of channels to be frequency multiplexed with a spacing not attainable by other techniques.
© (1984) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
I. W. Stanley and D. W. Smith "Progress In Coherent Optical Fibre Transmission Techniques In The United Kingdom", Proc. SPIE 0500, Fiber Optics: Short-Haul and Long-Haul Measurements and Applications II, (26 December 1984);


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