LOW-FREQUENCY FLUCTUATION-INDUCED BY INJECTION-CURRENT MODULATION IN SEMICONDUCTOR-LASERS WITH OPTICAL FEEDBACK

Low-frequency fluctuations in semiconductor lasers with optical feedba ck are investigated when high-frequency modulation is applied to an in jection current. Synchronization of the laser output power with the mo dulation within +/-3 MHz centered at the frequency corresponding to th e external cavity mode was observed. However, for modulation of the de tuned frequency from the external cavity mode, low-frequency fluctuati ons were induced in the laser output power, and these fluctuations wer e observed within a range of modulation of approximately +/-100 MHz at the center frequency of the external cavity mode. (C) 1998 Optical So ciety of America.