Abstract
Linewidth narrowing of the radio frequency beat-tones and the optical-modes is experimentally investigated in a quantum-dash mode-locked laser diode subject to optical injection of pulses. In comparison to the linewidth exhibited by the beat-tones in passive mode-locking conditions, a remarkable reduction to less than is achieved when the laser is under optical injection. From this beat-tone signal, an integrated root-mean-square timing jitter of is calculated. In addition, a quadratic profile of the optical linewidth with the wavelength is observed in active locking, reaching a minimum of for the longitudinal modes around and progressively increasing to for modes at .
© 2011 Optical Society of America
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