Abstract

We demonstrate a simple and reliable scheme for wavelength switching in an actively harmonic mode-locked Fabry–Perot laser diode (FPLD) that is coupled to a highly dispersive external fiber cavity. Wavelength switching between FPLD modes is achieved by detuning of the modulation frequency applied to the FPLD. A side-mode suppression ratio of as much as 40  dB is maintained, and the supermode noise suppression ratio is more than 50  dB for the whole wavelength switching operation range of 4.7  nm when the pulse repetition rate is 2  GHz. The wavelength- switching mechanism of our laser is based on the wavelength-dependent cavity resonance frequency shift that is due to chromatic dispersion, and we verify that our experimental results closely coincide with analytical results.

© 2006 Optical Society of America

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