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The quantum optical properties of two new infrared single photon centers in single crystal silicon are explored. The results suggest that the diamond nitrogen vacancy center may finally have a silicon-based competitor for quantum technologies.
We demonstrated a wide CW wavelength tuning range of 18 cm-1 for an epi-up mounted distributed feedback (DFB) quantum cascade laser (QCL) around 4.5 m, via current change. The wavelength tuning coefficient of an epi-up mounted DFB QCL is about 2.2 times of that of an epi-down mounted one. The 3dB modulation bandwidths of an epi-up and an epi-down mounted DFB QCLs are 15 kHz and 400 kHz, respectively.
We have achieved the first 25-Gb/s operation for a metamorphic laser with a high characteristic temperature (T0=187 K) at 1.3 µm on a GaAs substrate using a thin metamorphic buffer to suppress wafer curvature.
We demonstrate dual-wavelength lasers operating with simultaneous emission for a range of difference-wavelengths by accessing the various in homogeneously broadened dot states. We investigate temperature tuning and quantify factors affecting mode stability, including temperature and difference-wavelength.
A low power consumption tunable DFB laser diode array, integrated with backside waveguides, is experimentally demonstrated. Fiber output power of 14 dBm was obtained in full L-band with module power consumption less than 3 W.
A novel rear-side wavelength monitor scheme for a 16-DFB LD array with unequally spaced waveguides is proposed. The measured variations in the monitored wavelengths are less than ±1.2 GHz across the ITU-T grid.
We present a new analytical model combining the heat equation with rate equations to reproduce experimentally obtained output intensity of terahertz quantum-cascade lasers subject to optical pulse injection and demonstrate good agreement with the experiments.
An athermal multi-wavelength VCSEL array is demonstrated using thermally-actuated cantlevers. The wavelength variation is reduced within ± 0.017/K, which is 4 times smaller than conventional VCSELs, enabling four wavelengths array in 2.5nm spacing under uncooled operations.
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