Effect of the nonlinear gain in the visibility of a semiconductor laser with incoherent feedback in the coherence collapsed regime

We study the influence of the gain saturation parameter /spl epsiv/ on the visibility of a semiconductor laser subject to optical feedback in the coherence collapsed state. The experimental measurements are compared with the results obtained integrating the Lang and Kobayashi equations and a good agreement is found varying the amount of feedback and using different values of /spl epsiv/. The analysis reveals that there is a best value of /spl epsiv/ that fits the experimental measurements and that, for this value of /spl epsiv/, the values of /spl gamma/ found are in the expected relation with the attenuation used experimentally.>