−1 V Bias 56 Gbps Germanium Waveguide p-i-n Photodetector with Silicon Contacts

We demonstrate a silicon-contact-only 56 Gbps germanium waveguide photodetector operating at −1 V. The dark current is below 4 nA and the responsivity is 0.74 A/W at 1550 nm and 0.93 A/W at 1310 nm.