Photonics Research, 2020, 8 (7): 07001118, Published Online: Jun. 4, 2020
64 Gb/s low-voltage waveguide SiGe avalanche photodiodes with distributed Bragg reflectors Download: 689次
Abstract
We demonstrate low-voltage waveguide silicon-germanium avalanche photodiodes (APDs) integrated with distributed Bragg reflectors (DBRs). The internal quantum efficiency is improved from 60% to 90% at 1550 nm assisted with DBRs while still achieving a 25 GHz bandwidth. A low breakdown voltage of 10 V and a gain bandwidth product of near 500 GHz are obtained. APDs with DBRs at a data rate of 64 Gb/s pulse amplitude modulation with four levels (PAM4) show a 30%–40% increase in optical modulation amplitude (OMA) compared to APDs with no DBR. A sensitivity of around at a data rate of 64 Gb/s PAM4 and a bit error rate of is realized for APDs with DBRs, which improves the sensitivity by compared to APDs with no DBR.
Binhao Wang, Zhihong Huang, Yuan Yuan, Di Liang, Xiaoge Zeng, Marco Fiorentino, Raymond G. Beausoleil. 64 Gb/s low-voltage waveguide SiGe avalanche photodiodes with distributed Bragg reflectors[J]. Photonics Research, 2020, 8(7): 07001118.