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Optica Publishing Group
  • Journal of the Optical Society of Korea
  • Vol. 18,
  • Issue 5,
  • pp. 453-458
  • (2014)

A High Birefringent Polymer Terahertz Waveguide: Suspended Elliptical Core Fiber

Open Access Open Access

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 <TEX>$10^{-2}$</TEX> over a wide frequency range, and an extremely large mode birefringence(<TEX>${\approx}0.06226$</TEX>) 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.

© 2014 Optical Society of Korea

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