High birefringence hollow-core anti-resonant terahertz photonic crystal fiber with ultra-low loss
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School of electronic engineering, Xi’an University of Posts and Telecommunications

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National Natural Science Foundation of China (approval No.: 618751656177518061772417), Shaanxi international science and technology cooperation and exchange project (approval No.: 2017KW-027), collaborative innovation project of Shaanxi Provincial Department of Education (No.: 20JY060), Shaanxi project innovation capability support plan (No.: 2021TD-09) Project supported by the joint graduate training workstation of Xi'an University of Posts and Telecommunications (approval No.: JJG20205) and the graduate innovation fund of Xi'an University of Posts and Telecommunications (approval No.: CXJJLZ2019025).

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    Abstract:

    An ultra-low loss and high birefringence hollow core anti-resonant terahertz photonic crystal fiber based on cyclic olefin copolymer (COC) is proposed. The cladding of the fiber consists of two groups (six in total) nodeless embedded sleeves. The guided wave characteristics are analyzed by using the finite difference time domain method combined with the perfectly matched layer boundary conditions. The simulation results show that the total transmission loss is less than 0.1 dB/m, birefringence is more than 2.12 × 10-5 within the range of 0.8 THz - 1.35 THz, dispersion in ± 0.027 ps/THz/cm. At 1.12 THz, the minimum total transmission loss is only 0.543 × 10-2 dB/m, birefringence value 2.06 × 10-4. The bending performance of the fiber is analyzed. It is shown that in y direction, when the bending radius is more than 19 cm, the bending loss is less than 0.1 dB/m, and the bending performance is good.

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History
  • Received:August 19,2021
  • Revised:September 21,2021
  • Adopted:October 19,2021
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