Pulse train timing stability improvement and repetition frequency control of a monolithic mode-locked two-section quantum well semiconductor laser emitting at 1070 nm by all-optical self-feedback configurations

Abstract

Compact monolithic passively mode-locked semiconductor lasers offer repetition frequencies in the Multi-GHz range and the generation of picosecond-short optical pulses. Their pulse train timing stability however, is considerable lower as compared to fiber-based pulsed lasers. All-optical self-feedback configurations have been studied that allow to substantially improve the timing stability. We present recent experimental results on the pulse train stabilization of a monolithic two-section quantum-well (QW) semiconductor laser emitting at 1070 nm by different fiber-based feedback configurations. Besides the timing jitter (TJ), we study the repetition frequency control and its dependence on the feedback-cavity parameters (e.g. feedback strength, coarse and fine delay lengths).