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Condition for short pulse generation in ultrahigh frequency mode-locking of semiconductor lasers

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2 Author(s)
Lau, K.Y. ; Dept. of Electr. Eng. & Comput. Sci., California Univ., Berkeley, CA, USA ; Paslaski, J.

It is shown that although it is possible to obtain mode-locking without self-pulsation when certain criteria are satisfied, the shortest pulses are almost always generated at or close to the onset of self-pulsation. Thus, the amplitude of the optical pulse train is modulated by the (relatively) low-frequency envelop of a few gigahertz under this condition. This observation was obtained by simultaneously measuring the pulsewidth using an autocorrelator and monitoring the optical intensity using a high-speed photodiode and a microwave spectrum analyzer. It is concluded that while it is possible to generate picosecond optical pulses in ultrahigh-frequency mode-locking of quantum-well lasers, very short pulses ( to 1 ps) are almost always accompanied by self-pulsation which is manifested as low-frequency (gigahertz) envelope modulation of the optical pulse train.<>

Published in:

Photonics Technology Letters, IEEE  (Volume:3 ,  Issue: 11 )