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Ultracompact dual-mode waveguide crossing based on subwavelength multimode-interference couplers

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Abstract

We propose and experimentally demonstrate a novel ultracompact dual-mode waveguide crossing based on subwavelength multimode-interference couplers for a densely integrated on-chip mode-division multiplexing system. By engineering the lateral-cladding material index and manipulating phase profiles of light at the nanoscale using an improved inverse design method, a subwavelength structure could theoretically realize the identical beat length for both TE0 and TE1, which can reduce the scale of the device greatly. The fabricated device occupied a footprint of only 4.8 μm×4.8 μm. The measured insertion losses and crosstalks were less than 0.6 dB and ?24 dB from 1530 nm to 1590 nm for both TE0 and TE1 modes, respectively. Furthermore, our scheme could also be expanded to design waveguide crossings that support more modes.

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DOI:10.1364/prj.6.000660

基金项目:National Natural Science Foundation of China (NSFC) 10.13039/501100001809 (61775069).

收稿日期:2018-02-08

录用日期:2018-04-11

网络出版日期:2018-04-27

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Weijie Chang:School of Optical and Electrical Information, Huazhong University of Science and Technology, Wuhan 430074, ChinaWuhan National Laboratory for Optoelectronics, Huazhong University of Science and Technology, Wuhan 430074, China
Luluzi Lu:School of Optical and Electrical Information, Huazhong University of Science and Technology, Wuhan 430074, ChinaWuhan National Laboratory for Optoelectronics, Huazhong University of Science and Technology, Wuhan 430074, China
Xinshu Ren:School of Optical and Electrical Information, Huazhong University of Science and Technology, Wuhan 430074, ChinaWuhan National Laboratory for Optoelectronics, Huazhong University of Science and Technology, Wuhan 430074, China
Dongyu Li:School of Optical and Electrical Information, Huazhong University of Science and Technology, Wuhan 430074, ChinaWuhan National Laboratory for Optoelectronics, Huazhong University of Science and Technology, Wuhan 430074, China
Zepeng Pan:School of Optical and Electrical Information, Huazhong University of Science and Technology, Wuhan 430074, ChinaWuhan National Laboratory for Optoelectronics, Huazhong University of Science and Technology, Wuhan 430074, China
Mengfan Cheng:School of Optical and Electrical Information, Huazhong University of Science and Technology, Wuhan 430074, ChinaWuhan National Laboratory for Optoelectronics, Huazhong University of Science and Technology, Wuhan 430074, China
Deming Liu:School of Optical and Electrical Information, Huazhong University of Science and Technology, Wuhan 430074, ChinaWuhan National Laboratory for Optoelectronics, Huazhong University of Science and Technology, Wuhan 430074, China
Minming Zhang:School of Optical and Electrical Information, Huazhong University of Science and Technology, Wuhan 430074, ChinaWuhan National Laboratory for Optoelectronics, Huazhong University of Science and Technology, Wuhan 430074, China

联系人作者:Minming Zhang(mmz@hust.edu.cn)

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引用该论文

Weijie Chang, Luluzi Lu, Xinshu Ren, Dongyu Li, Zepeng Pan, Mengfan Cheng, Deming Liu, and Minming Zhang, "Ultracompact dual-mode waveguide crossing based on subwavelength multimode-interference couplers," Photonics Research 6(7), 660-665 (2018)

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