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Proceedings Paper

Investigation of the synchronization requirements for optical fibre PPM
Author(s): Jaafar M. H. Elmirghani; Robert A. Cryan; F. M. Clayton
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Paper Abstract

Self synchronization of the optical fiber n-ary PPM format entails acquiring the slot, frame frequency, and frame phase information directly from the PPM stream. Processing the PPM power spectral density can result in extracting the slot and frame frequency leaving an nth degree frame phase ambiguity to be resolved. We identify two classes of naturally occurring PPM sequences and present a novel technique for acquiring the frame phase directly from the incoming data stream. The technique is superior to previous methods since it does not involve added code redundancy, loss in sensitivity or bit rate. The frame phase synchronizers are shown to be upgradable and thus capable of coping with the required PPM word size. Original theoretical and practical results are reported for the synchronizers. Tracking the first two additional sequences is demonstrated and shown to offer 10.4 dB improvement in the discrete frame spectral component joined with 8.4 X 10-3 rad2 reduction in the timing variance.

Paper Details

Date Published: 4 November 1993
PDF: 12 pages
Proc. SPIE 1974, Transport Technologies for Broadband Optical Access Networks, (4 November 1993); doi: 10.1117/12.161500
Show Author Affiliations
Jaafar M. H. Elmirghani, Univ. of Huddersfield (United Kingdom)
Robert A. Cryan, Manchester Metropolitan Univ. (United Kingdom)
F. M. Clayton, GEC Hirst Research Labs. (United Kingdom)


Published in SPIE Proceedings Vol. 1974:
Transport Technologies for Broadband Optical Access Networks

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