Error Probability of Convolutional Coding in Stretched Pulse OOK Optical Channels

Hiroyuki FUJIWARA  Juro UENO  Hiromasa KUDO  Ikuo OKA  Ichiro ENDO  

IEICE TRANSACTIONS on Communications   Vol.E76-B   No.2   pp.178-186
Publication Date: 1993/02/25
Online ISSN: 
Print ISSN: 0916-8516
Type of Manuscript: PAPER
Category: Optical Communication
Viterbi decoding,  stretched pulse,  super encoder,  error matrix method,  ISI-matched decoder,  optical communication,  

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An optical On-Off Keyed (OOK) pulse is often stretched in dispersive channels, thus producing intersymbol interference (ISI) and degrading the performance. In this paper, error probability is presented for a convolutionally encoded optical OOK channels with ISI. Both ISI-matched and ISI-mismatched decoders are taken into account in the error probability analysis. The encoded optical OOK signal is received by Avalanche Photo Diode (APD) and the number of APD output photo-electrons is counted for soft decision Viterbi decoding. Error probability is derived for a 3-bit and an ideal soft decision schemes in ISI-mismatched decoder and for an ideal soft decision scheme in ISI-matched decoder. Numerical results demonstrate the effects of mismatching or 3-bit soft decision scheme. Some computer simulations are carried out to confirm the validity of the analysis.