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We experimentally investigate the RF linewidth and timing jitter over a widerange of delay tuning in a self-mode-locked two-section quantum dash lasersemitting at ~ 1.55 micron and operating at ~ 21 GHz repetition rate subject tosingle and dual optical feedback into gain section. Various feedback conditionsare investigated and optimum levels determined for narrowest linewidth andreduced timing jitter for both single and dual loop configurations. Wedemonstrate that dual loop feedback, with the shorter feedback cavity tuned tobe fully resonant, followed by fine tuning of the phase of the longer feedbackcavity, gives stable narrow RF spectra across the widest delay range, unlikesingle loop feedback. In addition, for dual loop configurations, under fullyresonant conditions, integrated timing jitter is reduced from 3.9 ps to 295 fs[10 kHz-100 MHz], the RF linewidth narrows from 100 kHz to < 1 kHz, with morethan 30 dB fundamental side-mode suppression. We show that dual loop opticalfeedback with separate fine tuning of both external cavities is far superior tosingle loop feedback, with increased system tolerance against phase delaymismatch, making it a robust and cost-effective technique for developingpractical, reliable and low-noise mode-locked lasers, optoelectronicoscillators and pulsed photonic circuits.

Optimum stabilization of self-mode-locked quantum dash lasers using dual optical feedback with improved tolerance against phase delay mismatch