Abstract
An optical short pulse source with a high repetition rate is very important for realizing future ultrahigh speed optical communication [1], Recently, Onodera et al. reported a very interesting technique for generating high repetition rate pulses by the rational detuning of the modulation frequency [2]. This technique was first demonstrated in a 17 GHz actively mode-locked semiconductor laser, and applied optical pulse storage in a cavity [3] and to a 21 GHz fiber laser [4], Rational harmonic mode-locking is a technique where an optical pulse train with a repetition rate of (np±1)△f can be produced when the modulation frequency is set at (p±1/n)△f, where △f is the longitudinal mode spacing, and p and n are integers.
© 1996 Optical Society of America
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