Generating conditions of the optical feedback noise in self-pulsing lasers
were experimentally examined. The noise characteristics were determined by
changing the operating power, the feedback distance and the feedback ratio
for several types of self-pulsing lasers. The idea of the effective modulat
ion index was introduced to evaluate the generating conditions in an unifor
m manner based on the mode competition theory. Validity of the idea was exp
erimentally confirmed for generation of noise.