The research of high birefringence polymer photonic crystal fiber with elliptical air holes and squeezed lattice

Abstract

In this paper, we study the birefringence of polymer photonic crystal fibers with elliptical air holes and squeezed triangular lattice in the cladding. We use the modified squeezing ratio to describe the squeezed degree reduced by both squeezed lattice and elliptical air holes. By using the supercell lattice method, the study on the influence of the squeezing on the birefringence of photonic crystal fibers is given. Studies show that the birefringence on the order of 10 -3 can be easily achieved. Based on these numerical simulations, it is noted that a simple function is given to express the relation between birefringence and the modified squeezing ratio of polymer photonic crystal fibers in a certain range.