Nonlinear propagation of phase-modulated optical pulses

A study is made of the influence of regular and random phase modulation on the nonlinear propagation of ultrashort pulses in optical fibers. An analysis is made in the constant channel approximation using path integrals. It is shown in particular that steady-state pulse propagation regime does not occur for regular phase modulation. This regime may be achieved for a statisticalaverage pulse with random phase modulation.