Design of a polarization splitter for an ultra-broadband dual-core photonic crystal fiber |
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| Affiliation: | 1.Academic Affairs Office, Nanjing University of Posts and Telecommunications, Nanjing 210023, China;2.College of Electronic and Optical Engineering, Nanjing University of Posts and Telecommunications, Nanjing 210023, China;3.State Key Laboratory of Luminescence and Applications, Changchun 130033, China;4.Beijing Times Photoelectric Technology Co., Ltd, Beijing 100094, China |
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| Abstract: | 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 dB at a wavelength of 1550 nm. When extinction ratio is less than -20 dB, 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. |
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| Keywords: | photonic crystal fiber polarization splitter broadband bandwidth extinction ratio |
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