A 1.0 cm long, two contact, monolithic extended-cavity laser has been fabricated and actively mode-locked at a repetition rate of 4.4 GHz to produce 9.0 ps optical pulses. Doubling of the optical pulse repetition rate of 8.8 GHz without changing the sinusoidal drive frequency is achieved by synchronously modulating two separate active regions.
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Raybon et al. (1992) studied this question.