Impact of long external fiber cavities on the pulse train stabilization of a passively mode-locked quantum dot laser emitting at 1250 nm

Passively mode-locked (PML) semiconductor lasers are compact photonic sources delivering a train of picosecond short optical pulses for optical clock distribution, high bit-rate optical time division multiplexing and compact microwave/millimeter-wave signal generation. The pulse train can exhibit considerable timing jitter (TJ). We extend the recently studied impact of dual long-cavity optical feedback (DLC OFB) by investigating the impact of two long external fiber cavities on the timing and amplitude stability as well as the pulse repetition rate (RR). Modeling results by a simple time-domain model allow to reproduce the experiments with good agreement.