Quantum Dot Lasers: Feedback Tolerance Limits Defined for Isolator-Free Photonic Integration

KAUST & UCSB researchers measured coherence collapse in QD lasers at −6.7 dB (21.4% return), enabling isolator-free PICs. Lasers maintained 10 Gbps at 15–45°C, with Lang-Kobayashi modeling confirming superior tolerance in cm-scale cavities.

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