An optical FSK receiver based on a multielectrode DFB laser is reported. The device, biassed just below threshold, acts as a tunable filter, FSK discriminator and photodetector. Using two-electrode DFB laser for the transmitter and the receiver a FSK transmission up to 1.5 Gbit/s with–20 dBm sensitivities for 10−9 BER over 40 km single mode optical fibre was observed.
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Chawki et al. (1990) studied this question.
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