2×40 Gbit/s RZ-DQPSK transmission over a 263 km fibre link with back-to-back receiver sensitivity of −27.5 dBm and Q factor >20 dB is demonstrated. The experiment demonstrates sufficient resilience against nonlinear phase noise and band limitation in a 40 Gbit/s WDM DEMUX with Q=17.5 dB.
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Bhandare et al. (2004) studied this question.
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