Mutual pulse injection seeding by the use of two fabry-Perot laser diodes to produce wavelength-tunable optical short pulses

A mutual pulse injection-seeding scheme is developed to produce wavelength-tunable optical short pulses by the use of two Fabry-Perot laser diodes, of which one is gain-switched and the other is dc biased. Wavelength tuning of the optical pulses is achieved by simply adjusting a tunable optical filter while maintaining a constant repetition frequency of 3.0 GHz. The sidemode suppression ratio obtained is more than 30 dB over the wavelength-tuning range of 19 nm. The system is simple and robust.