In this paper, we analyse the bit error rate reduction for
return-to-zero coding with different duty cycle. It is shown that
the optimal design of duty cycle of a given system lies in a
compromise between spontaneous emission, intersymbol interferences
and interchannel interference. We have carried out the semianalyitic
simulations to find the dependence of optimum duty cycle on
different system parameters. We found that the optimum duty cycle
decreases as the channel spacing increases. For channels without
ICI, BER is nearly a constant over a wide range of duty cycle as
long as ISI is negligible.
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