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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
Publication Date: 1993/02/25
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.