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High-Speed and High-Responsivity Asymmetric Waveguide Photodiode with Low Optical Back-Reflection
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.
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BibTeX
@misc{zhang2026highspeed,
title = {{High-Speed and High-Responsivity Asymmetric Waveguide Photodiode with Low Optical Back-Reflection}},
author = {Zhijun Zhang and Xuejie Gao and Qiunan Li and Xiaoyu Mi},
howpublished = {arXiv},
year = {2026},
month = sep,
doi = {10.48550/arxiv.2609.01138},
eprint = {2609.01138},
archivePrefix = {arXiv},
url = {https://arxiv.org/abs/2609.01138},
}
RIS
TY - UNPB
TI - High-Speed and High-Responsivity Asymmetric Waveguide Photodiode with Low Optical Back-Reflection
AU - Zhijun Zhang
AU - Xuejie Gao
AU - Qiunan Li
AU - Xiaoyu Mi
PY - 2026
DA - 2026/09/01
PB - arXiv
DO - 10.48550/arxiv.2609.01138
UR - https://arxiv.org/abs/2609.01138
AB - 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.
ER -