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High-Speed and High-Responsivity Asymmetric Waveguide Photodiode with Low Optical Back-Reflection

Year: 2026

Type: preprint

Abstract: We numerically demonstrate an asymmetric corner-reflector uni-traveling-carrier waveguide photodiode (UTC-WGPD) that simultaneously suppresses optical back-reflection and breaks the bandwidth-responsivity trade-off. Off-center beam coupling introduces geometric asymmetry to eliminate retroreflection while maintaining efficient light trapping. 3D optoelectronic simulations reveal that at 1550 nm, a 15-μm^2 device exhibits a 275-GHz 3-dB bandwidth, 0.68-A/W responsivity (54.5% quantum efficiency), and -29-dB back-reflection, achieving a 150-GHz bandwidth-efficiency product. This design offers a scalable, low-reflection detection scheme for sub-terahertz transceivers and dense photonic integration.

Source: arXiv (Cornell University)

DOI: 10.48550/arxiv.2609.01138

Authors: Zhang, Zhijun, Gao, Xuejie, Li, Qiunan, Mi, Xiaoyu

Institutions: Yongjiang Laboratory, Beijing University of Posts and Telecommunications, University of Electronic Science and Technology of China

Language: English

Topic: Photonic and Optical Devices

Subfield: Electrical and Electronic Engineering

Field: Engineering

Domain: Physical Sciences

Open Access status: green

Funder: National Key Research and Development Program of China

OpenAlex ID: W7206193566

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