Abstract
An investigation of the characteristics of several multilevel ‘alphabetic’ line codes of type ‘mBn_X’ is described. Multilevel codeclasses which used two dictionaries and up to five (‘mBn_5’) different symbols were considered. A total of thirteen different optical fibre communication systems were designed. The extra power budget, transmission efficiency, hardware complexity, and end-to-end delays of multilevel alphabetic line coders were compared with binary and ‘linear’ line coders. A data communication simulator was built called SIMALCODE: simulator for alphabetic line coding and decoding. This allowed examination of the required type of line coder in terms of timing extraction, error detection strategies and the buffering for the required data reliability. A ‘codeset’ could be selected from many of these codeclasses in billions of ways and multilevel coding theory is required to select the most appropriate.
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