A 25Gbps low-voltage waveguide Si-Ge avalanche photodiode

We demonstrate a waveguide Si-Ge avalanche photodiode with a breakdown voltage of -10V, a speed of 25GHz, and a gain-bandwidth product of 276GHz. The APD optical receiver achieved sensitivities of -25dBm and -16dBm at 12.5Gbps and 25Gbps at 1550nm, respectively.

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