Highly unidirectional InAs/InGaAs/GaAs quantum-dot ring lasers

Hongjun Cao; Hui Deng; Hai Ling; Chiyu Liu; Smagley, Vladimir A.; Caldwell, Robert B.; Smolyakov, Gennady A.; Gray, Allen L.; Lester, Luke F.; Eliseev, Petr G.; Osinski, Marek
May 2005
Applied Physics Letters;5/16/2005, Vol. 86 Issue 20, p203117
Academic Journal
We report fabrication and characterization of semiconductor ring lasers with quantum-dot active region. The InAs/InGaAs/GaAs “dots-in-a-well” ridge-waveguide ring lasers are monolithically integrated with coupling waveguides and monitoring quantum-dot photodetectors. The lowest threshold current density for semiconductor ring lasers is demonstrated. When enhanced by a forward biased S-section waveguide, stable unidirectional operation with record suppression ratio of counterpropagating waves exceeding 30 dB is achieved.


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