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Opt Express. 2007 May 14;15(10):6044-52.

A hybrid AlGaInAs-silicon evanescent waveguide photodetector.

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  • 1University of California, Santa Barbara, Department of Electrical and Computer Engineering, Santa Barbara, CA 93106, USA.


We report a waveguide photodetector utilizing a hybrid waveguide structure consisting of AlGaInAs quantum wells bonded to a silicon waveguide. The light in the hybrid waveguide is absorbed by the AlGaInAs quantum wells under reverse bias. The photodetector has a fiber coupled responsivity of 0.31 A/W with an internal quantum efficiency of 90 % over the 1.5 mum wavelength range. This photodetector structure can be integrated with silicon evanescent lasers for power monitors or integrated with silicon evanescent amplifiers for preamplified receivers.

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