Coded multipulse modulation in optical communication systems

• Published in: IEEE transactions on communications Vol. 42; no. 234; pp. 574 - 582
• Main Authors: Atkin, G.E., Fung, K.-S.L.
• Format: Journal Article
• Language: English
• Published: New York, NY IEEE 01.02.1994; Institute of Electrical and Electronics Engineers
• Subjects: Applied sciences; Background noise; Bandwidth; Exact sciences and technology; Modulation coding; Optical attenuators; Optical fiber communication; Optical modulation; Optical noise; Optical pulses; Optical receivers; Pulse modulation; Systems, networks and services of telecommunications; Telecommunications; Telecommunications and information theory; Transmission and modulation (techniques and equipments); Photoelectron; M ary modulation; Photon counting; Optical transmission; Coding; Optical telecommunication; Pulse position modulation; Optical pulse; Binary code; Photodetector; Demodulation
• ISSN: 0090-6778; 1558-0857
• DOI: 10.1109/TCOMM.1994.577084

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.< >