Abstract
We design a new kind of high birefringence photonic crystal fibers with square-lattice cladding. Through changing the size of only four air holes in the x and y direction respectively, the birefringence is highly increased. It reaches to 1.643×10 -3 when the wavelength is 1.8μm. Based on the finite element method, the mode fields, dispersion and confinement loss of this kind of photonic crystal fibers are all analyzed.
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