Decoding with Stretched Pulses in Laser PPM Communications

1 September 1983

journal article
Published by Institute of Electrical and Electronics Engineers (IEEE) in IEEE Transactions on Communications

Vol. 31 (9) , 1037-1045
https://doi.org/10.1109/tcom.1983.1095933

Abstract

The design and performance of optical PPM communication systems with ideal (rectangular) pulses have been well documented. However, many optical channels (fibers, atmosphere, clouds) are extremely dispersive to narrow pulses, producing receiver pulses that are spread (stretched) in time. This stretching produces interslot interference within a PPM frame, and if severe enough, can stretch over several frames (intersymbol interference). In this paper, laser pulse stretching in optical PPM formats is investigated in terms of performance degradation and decoder design alternatives. Several methods are considered for combating the pulse stretching, including pulse equalization, extended pulse integration, and pulse shape matching. Performance of these methods is compared for the case of exponential stretching and Gaussian statistics.

Keywords

This publication has 8 references indexed in Scilit:

On Gaussian Error Probabilities in Optical Receivers
IEEE Transactions on Communications, 1980
Performance of Optical Receivers with Avalanche Photodetection
IEEE Transactions on Communications, 1979
Minimum MSE Equalization of Digital Fiber Optic Systems
IEEE Transactions on Communications, 1978
Optical Pulse Position Modulation with Multiple Positions per Pulsewidth
IEEE Transactions on Communications, 1977
Optical Communications Between Underwater and Above Surface (Satellite) Terminals
IEEE Transactions on Communications, 1976
The distribution of gains in uniformly multiplying avalanche photodiodes: Theory
IEEE Transactions on Electron Devices, 1972
Some experiments on the propagation of light pulses through clouds
Proceedings of the IEEE, 1970
M-ary Poisson Detection and Optical Communications
IEEE Transactions on Communications, 1969