High-speed and high-responsivity InP-based uni-traveling-carrier photodiodes

• Main Authors: Meng, Qianqian, Wang, Hong, Liu, Chongyang, Guo, Xin, Gao, Jianjun, Ang, Kian Siong
• Other Authors: School of Electrical and Electronic Engineering
• Format: Article
• Language: English
• Published: 2018
• Subjects: High Speed; Dipole-doped Structure
• Online Access: https://hdl.handle.net/10356/87770; http://hdl.handle.net/10220/45511
• Institution: Nanyang Technological University

In this paper, top-illuminated InP-based uni-traveling-carrier photodiodes (UTC-PDs) with dipole-doped structure which achieve both high speed and high responsivity simultaneously have been reported. With optimization of device size and layer structure, dipole-doped UTC-PDs have demonstrated a measured optical-to-electrical 3-dB bandwidth of over 40 GHz and a maximum responsivity of 0.6 A/W at optical input power of 100 mW. By using a semi-analytical equivalent circuit model, the 3-dB bandwidth was predicted to be 103 GHz. This high 3-dB bandwidth and responsivity yield a high figure-of-merit value of 61.8 A/W·GHz.