In this paper intrachannel nonlinearities in a return-to-zero differential-phase-shift-keyed (RZ-DPSK) 40-Gb/s 32/spl times/100-km system are compensated in the absence of signal power symmetry using a single LiNbO/sub 3/ conjugator and results in two decades of improvement in bit-error rate (BER). The reduction of transmission impairments enables the reach of the system to be extended from 5200 to 6400 km with a measured BER =5/spl times/10/sup -4/. This paper also presents a first-order perturbation analysis that describes the effects of optical-phase conjugation and dispersion mapping on the optical field of pulses.
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Chowdhury et al. (2005) studied this question.
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