Novel bandgap-engineered quantumdot devices are reported: a dual-wavelength laser, a gain-broadened laser/amplifier employing a bandgap-graded cavity, and a multi-wavelength laser array with a 20 nm tuning range at 1280 nm. The devices are realized using a multi-bandgap post-growth intermixing technique.Keywords-quantum dots, intermixing, gain broadening, bandgap engineering , multiple wavelength laser arrays.
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