Repetition rate and wavelength tuning of monolithic 40 GHz mode-locked lasers based on InP

The repetition rate and wavelength tuning behaviour of monolithically integrated 40 GHz modelocked lasers based on GaInAsP/InP for passive and hybrid mode-locking have been investigated experimentally. Large repetition rate shifts (≥500 MHz) and locking bandwidths (100... 500 MHz) are demonstrated by only changing the dc gain and absorber bias conditions. Simultaneously, the width of the 2 ps pulses and low timing jitter values (<300 fs) are kept almost unchanged. A pronounced influence of wavelength tuning on other pulse characteristics and repetition rate tuning is not observable. The achieved tuning ranges are discussed in relation to existing fabrication tolerances.