Abstract
This chapter discusses the theory of semiconductor laser mode locking and reviews experimental work. Two distinct, but complementary, approaches are used to analyze mode-locking behavior. The models correspond to the spectral and time analysis of the mode-locking process, respectively. In the spectral analysis, an ensemble of standing-wave cavity modes of the laser and the external cavity are considered. In the second approach to mode-locking theory, the mode-locked standing waves of the cavity are decomposed into traveling waves. The interference of these modes results in a radiation pulse of width τ p propagating in the cavity. The theory describes how the pulse envelope is modified as it propagates through the cavity. The mode-locking technique, when coupled with external modulators and a multiplexer, appears to be a promising source of lightwave radiation for future systems that require short pulse widths and high bit rates. There are several techniques that yield longer pulses. Direct modulation of the gain by sinusoidal microwave or short pulse current injection results in relaxation oscillations if the total applied current passes through the threshold.
Published Version
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