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Design of a polarization splitter for an ultra-broadband dual-core photonic crystal fiber

Chinese Physics B 2022年第5期31卷 407-415页

作者：李永涛邓洁松阳圳邹辉马玉周 Academic Affairs Office Nanjing University of Posts and TelecommunicationsNanjing 210023China College of Electronic and Optical Engineering Nanjing University of Posts and TelecommunicationsNanjing 210023China State Key Laboratory of Luminescence and Applications Changchun 130033China Beijing Times Photoelectric Technology Co. LtdBeijing 100094China

A novel ultra-broadband polarization splitter based on a dual-core photonic crystal fiber(DC-PCF)is designed.The full-vector finite element method and coupled-mode theory are employed to investigate the characteristics of the polarization splitter.According to the numerical results,a graphene-filled layer not only broadens the working bandwidth but also reduces the size of the polarization splitter.Furthermore,the fluorine-doped region and the germanium-doped region can broaden the bandwidth.Also,the 4.78 mm long polarization splitter can achieve an extinction ratio of-98.6 d B at a wavelength of 1550 nm.When extinction ratio is less than-20 d B,the range of the wavelength is 1027 nm-1723 nm with a bandwidth of 696 nm.Overall,the polarization splitter can be applied to all-optical network communication systems in the infrared and near-infrared wavelength range.

关键词： photonic crystal fiber polarization splitter broadband bandwidth extinction ratio

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维普期刊数据库

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Theoretical simulation of a polarization splitter based on dual-core soft glass PCF with micron-scale gold wire

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Chinese Physics B 2016年第12期25卷 300-307页

作者：刘强李曙光王新宇石敏 Key Laboratory of Metastable Materials Science and Technology College of ScienceYanshan University

A polarization splitter based on dual-core soft glass photonic crystal fiber （PCF） filled with micron-scale gold wire is proposed. The characteristics of the polarization splitter are studied by changing the structural parameters of the PCF and the diameter of the gold wire with the finite element method （FEM）. The simulation results reveal that the coupling length ratio of the soft glass-based PCF is close to 2 and the corresponding curve is more fiat than that of the silica-based PCE The broadband bandwidth is 226 nm in which the extinction ratio is lower than -20 dB by the soft glass-based PCE i.e., from 1465 nm to 1691 nm which is competitive in the reported polarization splitters, and the bandwidth is just 32 nm by the silica-based PCE The insertion loss by our polarization splitter is just 0.00248 dB and 0.43 dB at the wavelength of 1.47 μm and 1.55 μm. The birefringence is obviously increased and the coupling length is decreased by filling gold wire into the soft glass-based or the silica-based PCE Also the birefringence based on the silica-based PCF is much larger than that based on the soft glass-based PCF whether or not the gold wire is introduced. The fabrication tolerance of the polarization splitter is also considered by changing the structural parameters. The polarization splitter possesses broad bandwidth, low insertion loss, simple structure and high fabrication tolerance.

关键词： photonic crystal fiber polarization splitter extinction ratio

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维普期刊数据库

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Design of passive polarization beam splitter in silicon-on-insulator waveguides

Design of passive polarization beam splitter in silicon-on-i...

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2007亚洲光电子会议光电子器件与集成分会场

作者： Chaojun Yan*a, Qili Zhou b,Junli Wan a, Tian Yangaa College of Electrical Engineering and Information Technology, Three Gorges University, Yichang, China b School of Computing and Creative Technologies, University of Abertay Dundee, UK

A passive polarization beam splitter in silicon-on-insulator （SOI） waveguides, which consists of two 3-dB multimode interference （MMI） couplers and two Mach-Zehnder interferometer （MZI） arms with the same length but different rib widths, has been proposed recently and a numerical method of design is needed because the analytical solution for this 3-dimensional （3D） SOI waveguides is difficult to achieve. The scalar finite difference beam propagation method （FD-BPM） is used to design the 3-dB MMI couplers and the positions of the input or output waveguides and the length of multimode waveguide are determined. In our design, the length of MMI couplers is 1228 micron when the width of rib is 36 micron. The propagation constants of TE-polarized and TM-polarized mode supported by 3D rib waveguides on SOI are calculated by the Semi-vector FD-BPM which is polarization related. From these data obtained for different rib widths （from 2.0 micron to 4.0 micron）, the appropriate length of MZI arms is selected. In our example, the widths of two arms are 3.4 micron and 2.0 micron respectively and the length of arms is 1506 micron. The TE-polarized light and TM-polarized light are input to the splitter separately and the Semi-vector FD-BPM is used to check the design.

关键词： Integrated optics polarization splitter MMI FD-BPM SOI simulation Mach–Zehnder interferometer semi-vector

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