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Impact of nonlinear phase noise on the optimum dispersion map for DQPSK systems

Costa, N. ; Fonseca, D. ; Cartaxo, A.

Impact of nonlinear phase noise on the optimum dispersion map for DQPSK systems, Proc European Conf. on Networks and Optical Communications - NOC, Faro, Portugal, Vol. -, pp. - - -, June, 2010.

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Abstract
Differential quadrature phase-shift keying (DQPSK) is one of the most promising modulation formats for future 43 Gbit/s regional and long-haul networks. However, nonlinear phase noise can be a quite limiting effect in such networks. In this paper, a brief discussion on the analysis of nonlinear phase noise in terms of in-phase and quadrature noise components at receiver input is presented. The impact of nonlinear phase noise on the performance of 43 Gbit/s DQPSK systems is analyzed using a semi-analytical simulation method. It is shown that nonlinear phase noise leads to about 1 dB of Q-factor penalty in DQPSK systems when the optimum power level is chosen, compared to when additive white Gaussian noise is assumed at the link output. Furthermore, it is shown that nonlinear phase noise has reduced influence on the optimum dispersion maps for DQPSK systems.