Threshold decoding of a rate 4/5 convolutional code is shown to improve the performance of a 1 Gbit/s optically preamplified on-off keyed (OOK) system by 3.7 dB to achieve a receiver sensitivity of 37 photon/bit (−56.2 dBm). The encoder/decoder is implemented as a single monolithic integrated circuit.
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Castagnozzi et al. (1994) studied this question.
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