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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...
We have investigated experimentally the pulse train (mode beating) stability of a monolithic mode-locked multi-section quantum-dot laser with an added passive auxiliary optical fiber cavity. Addition of the weakly coupled (?? -24 dB) cavity reduces the current-induced shift d??/dI of the principal peak in the RF spectrum (the effective pulse repetition frequency) by more than an order of magnitude,...
The mode-locking beat stability of a monolithic mode-locked quantum-dot laser is improved by an auxiliary mode-comb. A tenfold enhancement of the beating carrier red-shift and a substantial improvement of the RMS timing jitter is achieved.
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