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Fabrication and characterization of Y-junction-coupled S-section InAs/InGaAs/GaAs quantum-dot ring lasers with low threshold current density and high unidirectionality is reported. The new design suppresses unwanted counterpropagating modes more effectively than in the previous S-section-racetrack devices.
The optical and microwave spectra of 5-mm-long quantum-dot diode lasers are investigated. Comparison of observed beating lines with quantum-well lasers shows differences in the group index, linewidth, and line shape.
Nonlinear interactions between optical modes in semiconductor lasers and optical amplifiers perturb optical parameters in the vicinity of a strong mode frequency. This effect is considered in terms of slow and fast light propagation.
We report on quantum-dot-based optoelectronic integrated circuit incorporating twin ring lasers, waveguides, directional couplers, Y-junction mixer, and photodetectors. Frequency beating between integrated quantum-dot ring lasers is demonstrated for the first time.
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