  Soliton interactions in systems modelled by coupled nonlinear Schroedinger
(CNLS) equations and encountered in phenomena such as wave propagation in
optical fibers and photorefractive media possess unusual features : shape
changing intensity redistributions, amplitude dependent phase shifts and
relative separation distances. We demonstrate these properties in the case of
integrable 2-CNLS equations. As a simple example, we consider the stationary
two-soliton solution which is equivalent to the so-called partially coherent
soliton (PCS) solution discussed much in the recent literature.
