[OPTICAL REVIEW Vol. 9, No. 6 (2002) 234-237]

Modulation Induced Low-Frequency Fluctuations in Semiconductor Lasers with Optical Feedback and Their Suppression by Synchronous Modulation

Yoshiro TAKIGUCHI, Hidetaka KAN and Junji OHTSUBO*

Faculty of Engineering, Shizuoka University, 3-5-1 Johoku, Hamamatsu 432-8561, Japan

(Received May 23, 2002; Accepted August 12, 2002)

Modulation induced low-frequency fluctuations (LFFs) of a semiconductor laser in the presence of optical feedback are investigated. LFFs are controlled to a synchronous oscillation when an appropriate modulation very close to the resonance frequency of the external cavity is applied to the injection current. The dependence of the frequency locking on the modulation frequency and depth is studied.

Key words: semiconductor lasers, low-frequency fluctuations, chaos, laser control, laser modulation