Abstract
We analyze by simulation the performance of the differential quadrature phase-shift
keying (DQPSK) modulation format in dispersion-managed multi-span WDM optical systems at 43
Gb/s, with 50 GHz channel spacing, in the presence of fiber nonlinearity. We show that the use
of maximum-likelihood sequence-estimation (MLSE) receivers significantly helps to increase
tolerance to dispersion map design. We also show that the use of an MLSE algorithm which takes
into account the correlation of samples allows to improve system performance, partially
mitigating the impact of fiber non-linearity. Some of the results presented here hint at a
possible use of similar techniques in the context of coherent systems as well.
© 2010 IEEE
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