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At bit rates of the order of 40 Gb/s, on-off keying (OOK) transmission becomes severely impaired by non-linear effects, especially Intra-channel Four-Wave Mixing (IFWM). This paper reviews phase modulation techniques for the suppression of IFWM: in the Alternate-Phase Return-to-Zero (APRZ) and Pairwise APRZ (PAPRZ), the phase of the optical signal alternates between neighbouring bits or pairs of bits...
Intrachannel four-wave mixing (IFWM) represents main source of impairments in fiber transmission at 40 Gb/s. A number of phase modulation techniques have been proposed to suppress the IFWM. In this paper, we study a cost-effective way of increasing the nonlinear tolerance of a 40-Gb/s wavelength division multiplexing transmission system by asynchronous phase modulation (APM). This can be achieved...
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