Title :
Coded multipulse modulation in optical communication systems
Author :
Atkin, Guillermo E. ; Fung, Kai-San L.
Author_Institution :
Dept. of Electr. & Comput. Eng., Illinois Inst. of Technol., Chicago, IL, USA
Abstract :
An optical communication system using coded multipulse position modulation is described. The position of the pulses in each signalling interval are derived from general binary constant weight codes. The combined coding and modulation of multiple pulses provides a minimum distance between any two signaling frames. Photon counting is used at the receiving end for noiseless optical channel in which only quantum noise exists. For noisy optical channel with avalanche photodetector, threshold demodulation is used in which an optical pulse is considered present in a slot where the photoelectron count exceeds a given threshold. It is shown that this multipulse system gives better performance than the conventional single pulse system. The performance analysis can be applied to and binary constant weight code since only the general parameters of length, minimum distance, and weight of the code are needed
Keywords :
binary sequences; optical links; optical modulation; pulse position modulation; semiconductor device noise; telecommunication channels; avalanche photodetector; binary constant weight codes; code length; coded multipulse modulation; coding; minimum distance; multipulse system; noiseless optical channel; noisy optical channel; optical communication systems; optical pulse; performance analysis; photoelectron count; photon counting; pulse position modulation; quantum noise; signaling frames; signalling interval; threshold demodulation; Background noise; Bandwidth; Modulation coding; Optical attenuators; Optical fiber communication; Optical modulation; Optical noise; Optical pulses; Optical receivers; Pulse modulation;
Journal_Title :
Communications, IEEE Transactions on
DOI :
10.1109/TCOMM.1994.577084