Abstract
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.
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