Takanori SHIMIZU, Xinglong WANG and Hiroyuki YOKOYAMA

Opto-Electronics Research Laboratories, NEC Corporation, 34 Miyukigaoka, Tsukuba, 305 Japan

(Received June 2, 1995; Accepted August 23, 1995)

Asymmetric colliding-pulse mode-locking was successfully demonstrated in an InGaAsP laser. This laser had a single saturable absorber section located partway along the cavity length, and showed mode-locking operation at harmonics of the cavity roundtrip frequency. The method verified that optical pulse repetition up to subterahertz rates can be generated with nearly 1-mm-long mode-locked InGaAsP lasers.

Key words : semiconductor laser, mode-locking, ultrahigh speed, ultrashort light pulses, saturable absorption