Abstract
In this work, the impact of fine-delay tunable dual-cavity optical self-feedback (DC-OFB) on the pulse timing stability and pulse repetition rate (RR) frequency of a 1 mm long single-section self-mode-locked quantum-dot (QD) laser emitting at 1255nm is studied experimentally and by simulation. By tuning both microscopic dual-cavity delay lengths, we find a maximum RR tuning range of 70 MHz. A two-fold periodic structure is apparent every 25 ps which corresponds to the internal round trip time of the laser. A timing jitter (TJ) reduction by a factor of 16 down to 3.5 fs is obtained. Simulation results reproduce the experimentally observed RR trends with a good qualitative and quantitative agreement
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