Influence of radiation fluctuations on the magnitude of optoelectronic signal in semiconductor lasers with external optical feedback

Numerical modeling of dynamical processes in semiconductor lasers with external delayed optical feedback has been performed on the basis of the rate equations taking into account the quantum fluctuations of radiative transition rates. It has been shown that the nature of the optoelectronic signal as a function of pump current is determined by the magnitude of the optoelectronic coupling and corresponds to the behavior of the autocorrelation function of the radiation. It has been found that the radiation coherence decreases substantially with strong optical feedback. Experimental measurements confirming the theoretical results have been performed. Translated from Zhurnal Prikladnoi Spektroskopii, Vol. 75, No. 6, pp. 809–813, November–December, 2008.