Demonstration of low-phase noise in mode-locked lasers with facet-attached micro-lenses, enhancing linewidths significantly.
We demonstrate low-phase noise quantum-dash mode-locked lasers (QD-MLLD) with integrated external-cavity feedback circuits using facet-attached micro-lenses (FaML) as optical coupling elements. The intrinsic linewidths of the comb tones are reduced by a factor of 1000 and reach 30 kHz.
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Bao et al. (2025) studied this question.
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