NONLINEAR PROPAGATION OF INCOHERENT-LIGHT IN SINGLE-MODE SEMICONDUCTOR-DOPED GLASS-FIBERS WITH SATURABLE NONLINEARITY

Self-phase modulation and induced phase modulation of noisy fields in single-mode semiconductor-doped glass fibers with saturable nonlinearity is studied theoretically in a regime of zero group velocity dispersion and no group velocity mismatch. The results have shown that the saturable nonlinearity in such fibers imposes a limit to coherence time shortening and corresponding spectral broadening owing to the high order nonlinearity. The minimum incoherent light correlation time is determined by the so-called saturation parameter, which is the inverse of the saturation power.