4.6 Article

Study on the high birefringence and low confinement loss terahertz fiber based on the combination of double negative curvature and nested claddings

Journal

JOURNAL OF PHYSICS D-APPLIED PHYSICS
Volume 55, Issue 11, Pages -

Publisher

IOP Publishing Ltd
DOI: 10.1088/1361-6463/ac4136

Keywords

theory and design; fiber optics systems; terahertz fiber; polarization

Funding

  1. Guangdong Province Key Field R&D Program Project [2020B090922004]
  2. Jiangmen City Fundamental and Applied Fundamental Research Fund [2020030102130005402]
  3. National Natural Science Foundation of China [62001444]
  4. Natural Science Foundation of Zhejiang Province [LQ20F010009]
  5. Research Fund of The State Key Laboratory of Coal Resources and safe Mining, CUMT [SKLCRSM21KF010]

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This study designs a novel double negative curvature nested fiber structure by adding extra circular cladding tubes to enhance the birefringence and reduce the confinement loss. The results show that the fiber structure has high birefringence and low confinement loss in the frequency range of 1.75-2.6 THz.
A novel double negative curvature nested fiber structure is designed by adding extra circular cladding tubes to enhance the birefringence and reduce the confinement loss. The fiber structure is composed of eight circular cladding tubes and two semi-elliptical nested tubes. The transmission performances of terahertz fiber, including birefringence, confinement loss, dispersion and effective mode field area, are studied by changing the parameters of cladding tubes. In the frequency range of 1.75-2.6 THz, the broad bandwidth of 850 GHz with high birefringence (above 10(-4)) can be achieved. The confinement loss of y-polarization mode with the frequency of 2.575 THz can be as low as 0.00231 dB cm(-1). The waveguide dispersion coefficient is between +/- 0.188 ps (THz cm)(-1) in the frequency range of 2.0-2.475 THz. The maximum effective mode field area of x-polarization mode is 2.618 x 10(-6) m(2) at 2.6 THz.

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