Solitary wave solution for a non-integrable, variable coefficient nonlinear Schroedinger equation

A non-integrable, variable coefficient nonlinear Schroedinger equation which governs the nonlinear pulse propagation in an inhomogeneous medium is considered. The same equation is also applicable to optical pulse propagation in averaged, dispersion-managed optical fibre systems, or fibre systems with phase modulation and pulse compression. Multi-scale asymptotic techniques are employed to establish the leading order approximation of a solitary wave. A direct numerical simulation shows excellent agreement with the asymptotic solution. The interactions of two pulses are also studied