Fig. 4: High-speed performance of the device.
From: Ultrafast avalanche photodiode exceeding 100 GHz bandwidth
a The microscope image of fabricated 8-channel uni-multiplication-carrier avalanche photodiode array. The ground-signal-ground electrode is used. b The measured eye diagrams of high-speed on-off keying, four-level pulse amplitude modulation, and eight-level pulse amplitude modulation signals. c The measured bit error rate results for the on-off keying and four-level pulse amplitude modulation signals under different received optical power. d The measured bit error rate results for the on-off keying and four-level pulse amplitude modulation signals with different bitrates.
