Journal of the Optical Society of Korea

Optical Society of Korea (한국광학회)
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A High Birefringent Polymer Terahertz Waveguide: Suspended Elliptical Core Fiber

  • Wang, Jingli (College of Optoelectronic Engineering, Nanjing University of Posts and Telecommunications) ;
  • Chen, Heming (College of Optoelectronic Engineering, Nanjing University of Posts and Telecommunications) ;
  • Shi, Weihua (College of Optoelectronic Engineering, Nanjing University of Posts and Telecommunications)
  • Received : 2014.06.25
  • Accepted : 2014.08.13
  • Published : 2014.10.25
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Abstract

A novel high birefringent polymer terahertz (THz) fiber with a suspended elliptical core is proposed in this paper. The introduction of an elliptical core can enhance asymmetry to realize high mode birefringence, and a large porous outer cladding effectively isolates the core-guided mode from interacting with the surrounding environment. A full-vector finite element method(FEM) is used to analyze the characteristics of the THz fiber. Simulation results show that the suspended elliptical fiber exhibits high mode birefringence on a level of $10^{-2}$ over a wide frequency range, and an extremely large mode birefringence(${\approx}0.06226$) is obtained when ellipticity is 0.2. Moreover, a suspended hollow elliptical core fiber is also discussed for the purpose of lower loss, however high mode birefringence and low relative absorption loss can not coexist in such a kind of fiber.

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References

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