Analysis of an all-optical 3R regenerator for DPSK signals is presented. The phase regeneration is performed in the amplitude domain by the use of a fiber-based 2R regenerator. Strong reduction of phase fluctuation is predicted.
Performance of in-line all-optical signal regenerators utilizing self-phase modulation (SPM) or four-wave mixing (FWM) in fibers is analyzed. First, two types of SPM-based regenerators are analyzed and compared: one utilizes soliton-like pulse compression in anomalous-dispersion fiber and subsequent filtering and the other utilizes spectrum broadening in normal-dispersion fiber and subsequent spectrum slicing. Although both types of regenerators show good regenerator performance, one based on spectrum broadening and slicing has better ability of stabilization of signal amplitude while requiring larger signal power launched into the nonlinear fiber. Then the performance of FWM-based regenerators, which have ability of amplitude stabilization while maintaining phase information carried by the signal is discussed. It is shown that return-to-zero differential phase-shift keying transmission performance can be improved by the regenerator.
An analysis of a 2R optical regenerator consisting of a saturable absorber, a highly nonlinear fiber, and an optical bandpass filter is presented. How the regenerator improves the performance of quasi-linear highly-dispersed pulse transmission and reduces the transmission impairment caused by polarization-mode dispersion is numerically studied.
Solitons in dispersion-managed (DM) fibers are promising candidates for a modulation format to be used in long distance high-speed optical fiber data transmission. In this paper we perform a bit-error-rate analysis of a wavelength- division multiplexed (WDM) DM soliton system operated at 40 Gbit/s per channel. We consider the intra-channel pulse-to- pulse interaction, the noise-induced timing jitter, the collision-induced time shifts, and the signal-ASE (amplified spontaneous emission) and ASE-ASE beat noise as the factors limiting the system performance. Effects of filters in reducing the collision-induced timing jitter in WDM transmission are also examined. It is shown that the minimum channel spacing required for long-distance transmission can be reduced by the use of in-line filters especially when the noise amplification due to the filter excess gain is suppressed.
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