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High-speed waveguide integrated silicon photodetector on a SiN-SOI platform for short reach datacom

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Abstract

We present a waveguide integrated high-speed Si photodetector integrated with a silicon nitride (SiN) waveguide on an silicon-on-insulator (SOI) platform for short reach data communication in a 850 nm wavelength band. We demonstrate a waveguide couple Si pin photodetector responsivity of 0.44 A/W at 25 V bias. The frequency response of the photodetector is evaluated by the coupling of a femtosecond laser source through an SiN grating coupler of the integrated photodetector. We estimate a 3 dB bandwidth of 14 GHz at 20 V bias which, to the best of our knowledge, is the highest reported bandwidth for a waveguide integrated Si photodetector. We also present detailed optoelectronic DC and AC characterization of the fabricated devices. The demonstrated integrated photodetector could enable an integrated solution for scaling of short reach data communication and connectivity.

© 2019 Optical Society of America

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