Highly unidirectional Y-junction-coupled S-section quantum-dot ring lasers

Fabrication and characterization of Y-junction-coupled S-section InAs/InGaAs/GaAs quantum-dot ring lasers with high unidirectionality is reported. Stable unidirectional operation of the ring lasers is ensured by a new design that suppresses the unwanted counterpropagating modes more effectively than it was possible in the previous S-section-racetrack design.

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