Correlation between the birefringence and the structural parameter in photonic crystal fiber

Abstract

In order to simply design a highly birefringent photonic crystal fiber (HB-PCF), we numerically simulated the correlation between the birefringence and the structural parameter of photonic crystal fiber with square-lattice or triangle-lattice air-holes by using multipole method. It is shown that the phase birefringence B( λ) and the group birefringence G( λ) can be modulated by the structure parameter of normalized wavelength λ/ Λ and the relative air-hole size d/ Λ. Numerical results show very high phase and group birefringence of the order of 10 −2. The group birefringence becomes negative in the region where phase birefringence increases with an increase in normalized wavelength that does not appear in traditional highly birefringent fibers.