ABSTRACT
The mechanisms responsible for nonlinear impairments in single-channel phase modulated system employing differential detection are investigated. The role of dispersion precompensation is discussed. It is shown that precompensation may be designed as to minimize the in-phase components of the fluctuations thus reducing nonlinear impairments. In differential-phase-shift-keying the effect of precompensation is stronger than in differential-quadrature-phase-shift-keying. The results of an analytic theory are compared with split-step based computer simulations using realistic system parameters.
Subject(s)
Models, Theoretical , Nonlinear Dynamics , Telecommunications , Computer Simulation , Light , Scattering, RadiationABSTRACT
The dynamic behavior of single-channel transmission in standard fibers with strong dispersion management and linear compensating devices was theoretically and numerically analyzed. We compared a single pulse and a pseudorandom sequence to highlight the relevant roles played by nonlinearity-induced spectrum distortion and pulse interaction. As a result, 40/Gbit/s transmission on an 1800-km dispersion-management link with 100-km spans of standard fiber was obtained.
ABSTRACT
We demonstrate numerically that a compensation of the polarization mode dispersion can be observed for nonreturn-to-zero signals as a result of a trapping effect, in analogy to the well-known soliton behavior. Conditions for such compensation are shown, and a comparison with the soliton case is reported.
ABSTRACT
The interplay between amplif ied spontaneous emission noise and Kerr nonlinearity is shown to produce significant depolarization of light in long-haul transmission links operating close to zero dispersion. If polarization mode dispersion is neglected, a simple analytical theory predicts the length scale over which depolarization occurs. The analytical theory is compared with computer simulations, which also permit analysis of the case in which polarization mode dispersion is included.
ABSTRACT
We numerically study the evolution of nonsoliton signals in fiber links in the presence of the Kerr effect, chromatic dispersion, and the amplified spontaneous emission of optical amplifiers. Conditions in which the amplified spontaneous emission noise does not deeply affect the signal propagation are found, and the nonlinear Kerr compensation of the distortion induced by the chromatic dispersion is shown.
ABSTRACT
The limitation to the amplification of femtosecond pulses by erbium-doped fibers owing to the soliton self-frequency shift may be overcome by using a dispersion-shifted fiber. We show that this result holds irrespective of the relatively large residual frequency-dependent chromatic dispersion that is associated with the pumping of the doping ions. Nevertheless, resonant dispersion may lead to temporal broadening and distortion of the amplified pulse.
