[OPTICAL REVIEW Vol. 1, No. 2 (1994) 217-219]

α-Parameter Dependence of Chirped Pulse from Injection-Modulated Semiconductor Lasers

Kenji WADA, Yuichi AKAGE and Yoshio CHO

Department of Physics and Electronics, Faculty of Engineering, University of Osaka Prefecture, 1-1, Gakuen-cho, Sakai, Osaka, 593 Japan

(Accepted September 29, 1994)

It is found from a series of numerical simulations that a simple relation, ?t?fc=0.4α, holds between an amount of down-chirp (?fc) and a pulsewidth (?t) for pulses from an injection-modulated semiconductor laser having a known α-parameter value. This relation is useful for estimating the amount of chirp existing in pulses. The validity of the relation is examined by a direct observation of chirped pulses using a combination of a streak camera and a spectrometer.

Key words : semiconductor laser, pulse, chirp, time-resolved spectrum, α-parameter