Hot Paper - Photonics-assisted THz wireless communication enabled by wide-bandwidth packaged back-illuminated modified uni-traveling-carrier photodiode

Photonics-assisted THz wireless communication enabled by wide-bandwidth packaged back-illuminated modified uni-traveling-carrier photodiode

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Yuxin Tian 田雨欣 ¹, Boyu Dong 董博宇 ², Yaxuan Li 李雅萱 ², Bing Xiong 熊兵 ¹, Junwen Zhang 张俊文 ², Changzheng Sun 孙长征 ¹, Zhibiao Hao 郝智彪 ¹, Jian Wang 王健 ¹, Lai Wang 汪莱 ¹, Yanjun Han 韩彦军 ¹ ³, Hongtao Li 李洪涛 ¹, Lin Gan 甘霖 ¹, Nan Chi 迟楠 ², Yi Luo 罗毅 ¹ ³

¹ Beijing National Research Center for Information Science and Technology (BNRist), Department of Electronic Engineering, Tsinghua University, Beijing 100084, China
中国北京清华大学电子工程系北京信息科学与技术国家研究中心
² Key Laboratory of Information Science of Electromagnetic Waves (MoE), Department of Communication Science and Engineering, Fudan University, Shanghai 200433, China
中国上海复旦大学通信科学与工程系电磁波信息科学教育部重点实验室
³ Flexible Intelligent Optoelectronic Device and Technology Center, Institute of Flexible Electronics Technology of THU, Jiaxing 314000, China
中国嘉兴浙江清华柔性电子技术研究院柔性智能光电子技术研究所

https://doi.org/10.29026/oes.2024.230051

https://www.oejournal.org/article/doi/10.29026/oes.2024.230051

Opto-Electronic Science, 1 July 2024

Abstract

This paper presents a wide-bandwidth back-illuminated modified uni-traveling-carrier photodiode (MUTC-PD) packaged with standard WR-5 rectangular waveguide for high-speed wireless communications. With optimized epitaxy structure and coplanar waveguide electrodes, the fabricated 4-μm-diameter PD exhibits ultra-flat frequency response and high saturation power. Integrated passive circuits including low-loss bias-tee and E-plane probe are designed to package the PD into a compact module with waveguide output.

The packaged PD module has demonstrated a flat frequency response with fluctuations within ±2.75 dB over a broadband of 140–220 GHz and a high saturated output power of −7.8 dBm (166 μW) at 140 GHz. For wireless communication applications, the packaged PD is used to implement 1-m free space transmission at carrier frequencies of 150.5 and 210.5 GHz, with transmission rates of 75 and 90 Gbps, respectively.

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