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Propagation of lower-order modes in a radially anisotropic cylindrical waveguide with liquid crystal cladding

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2 Author(s)
Chen, Tien‐Jung ; Inst. of Electro-Opt. Eng., Nat. Chiao Tung Univ., Hsinchu, Taiwan ; Chen, Shu-Hsia

The propagation behavior of the four lower-order modes, HE11 , TE01, TM01, and HE21, in a radially anisotropic cylindrical waveguide with liquid crystal cladding is studied both theoretically and experimentally. The cylindrical waveguide is a doubly-clad fiber with an isotropic core and inner cladding and a radially anisotropic outer cladding made of nematic liquid crystal. Theoretically, the propagation and decay constants for the TE01 and TM01 modes are obtained by solving the wave equations exactly, while those for the HE11 and HE 21 modes are derived using perturbation techniques under the weakly guiding approximation. It is predicted that in such a structure the guided TE01 mode can be separated from the leaky HE11, TM01, and HE21 modes. The theoretical results show good agreement with the experimental observations for a 3 cm long fiber cell with a 5 μm inner cladding radius

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Lightwave Technology, Journal of  (Volume:13 ,  Issue: 8 )