Generation of ultrahigh-speed tunable-rate optical pulses using strongly gain-coupled dual-wavelength DFB laser diodes

A novel and simple method to generate a variable-rate, ultrahigh-speed optical pulse train is demonstrated using a dual-wavelength, strongly gain-coupled distributed-feedback laser diode. The repetition rate of the optical pulse train is continuously tunable from 25 to 80 GHz and no high-speed electronics are required in this method.