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 nonlineari ty is studied theoretically in a regime of zero group velocity dispers ion and no group velocity mismatch. The results have shown that the sa turable nonlinearity in such fibers imposes a limit to coherence time shortening and corresponding spectral broadening owing to the high ord er nonlinearity. The minimum incoherent light correlation time is dete rmined by the so-called saturation parameter, which is the inverse of the saturation power.