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Opt Lett. 2005 Apr 15;30(8):824-6.

High group birefringence in air-core photonic bandgap fibers.

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  • 1Hokkaido University, Sapporo 060-0814, Japan.


A numerical investigation of group birefringence is carried out on a recently reported highly birefringent hollow-core photonic bandgap fiber by use of an efficient vector finite-element method. The hollow fiber core has an area as large as that of approximately four airholes in the cladding region and assumes a rhombic shape with round corners, and the airholes in the cladding region are hexagonal and provide a high air-filling fraction. Numerical results show very high group birefringence of the order of 10(-2) and phase birefringence of the order of 10(-3).

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