Noise analysis of semiconductor lasers within the coherence collapse regime

The authors present a theoretical analysis of semiconductor laser noise with optical distant feedback. The results show good agreement with numerical simulations. With the analytical model developed, one can easily calculate the relative intensity noise (RIN), the frequency noise, and the spectral linewidth of the semiconductor laser diode. It was found that, because of the decreasing damping frequency, with increasing feedback, the maximum relative intensity noise at the relaxation frequency does not increase monotonically. The maximum RIN is given as the reciprocal value of the damping rate