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A Unified Theory of Intrachannel Nonlinearity in Pseudolinear Phase-Modulated Transmission

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1 Author(s)
Mecozzi, A. ; Dept. of Electr. & Inf. Eng., Univ. of L''Aquila, L''Aquila, Italy

It is shown that the phase distribution of the field and the detection scheme strongly affect the strength of the nonlinear impairments in phase-modulated transmission systems. It is found that precompensation is always a useful tool for minimizing the nonlinear impairments in differential phase-shift keying, where the mechanism for minimization is the reduction of the in-phase component of the nonlinear displacement. For differential quadrature phase-shift keying (DQPSK), the nonlinear impairments are instead minimized by a dispersion profile that maximizes the correlation of phase fluctuations of two consecutive pulses. When the number of interacting pulses is large, the performance of a DQPSK system is only weakly dependent on the dispersion profile.

Published in:

Photonics Journal, IEEE  (Volume:2 ,  Issue: 5 )