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Proceedings Paper

Broadband polarization beam splitter based on a tapered mismatched directional coupler
Author(s): Daigao Chen; Xi Xiao; Lei Wang; Wen Liu; Qi Yang
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Paper Abstract

We design and fabricate a broadband micro polarization beam splitter on SOI (Silicon-On-Insulator) substrate which is compatible with the 180 nm COMS process. The polarization splitter is based on mismatch coupling in which a tapered directional coupler structure with slowly varying waveguide width is used. The device is fabricated in Astar-IME silicon photonics platform. When the waveguide width of the wider port of the tapered waveguide is fixed at 550 nm, by sweeping the taper waveguide length in several waveguide width of the narrower port, the polarization splitter can realize high extinction ratios of the both polarizations in a broad wavelength range. When the waveguide width of the narrow port is 410 nm, the device can split the TE and TM polarizations in a 30 μm length with the extinction ratios of the both polarizations more than 15 dB over a wavelength range from 1500 nm to 1600 nm. The proposed polarization beam splitter is not sensitive to the fabrication error and has large tolerance. The polarization extinction ratios are still more than 10 dB in a wavelength range of 100 nm even if the waveguide width of the taper has a 50 nm fabrication error. Due to its simple structure and high performance, we believe this micro polarization beam splitter will be widely used in photonic integrated circuit, optical signal processing, and optical communication devices.

Paper Details

Date Published: 25 October 2016
PDF: 6 pages
Proc. SPIE 9685, 8th International Symposium on Advanced Optical Manufacturing and Testing Technologies: Design, Manufacturing, and Testing of Micro- and Nano-Optical Devices and Systems; and Smart Structures and Materials, 96850F (25 October 2016); doi: 10.1117/12.2240743
Show Author Affiliations
Daigao Chen, Huazhong Univ. of Science and Technology (China)
Wuhan Research Institute of Posts Telecommunications (China)
Xi Xiao, Wuhan Research Institute of Posts Telecommunications (China)
Lei Wang, Wuhan Research Institute of Posts Telecommunications (China)
Wen Liu, Huazhong Univ. of Science and Technology (China)
Univ. of Science and Technology of China (China)
Qi Yang, Wuhan Research Institute of Posts Telecommunications (China)


Published in SPIE Proceedings Vol. 9685:
8th International Symposium on Advanced Optical Manufacturing and Testing Technologies: Design, Manufacturing, and Testing of Micro- and Nano-Optical Devices and Systems; and Smart Structures and Materials
Xiangang Luo; Tianchun Ye; Tingwen Xin; Song Hu; Minghui Hong; Min Gu, Editor(s)

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