Feedback stabilization of high repetition-rate optical pulses from semiconductor mode-locked lasers (MLLs) with low noise performance is of special interest for optical clock recovery, lidar, optical frequency combs, high-speed data sampling, and optical time division multiplexing [1, 2], among other applications. It is highly desirable for feedback-based stabilization to achieve reduced sensitivity to drift of the optical phase/delay in the feedback loop, caused by aging, manufacturing tolerances or environmental changes. We have demonstrated reduced sensitivity of semiconductor MLLs to drift in optical delay using various dual-loop optical feedback schemes [3–5].

© 2019 IEEE

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