Abstract
The squeezed photonic crystal fibers have attracted significant attention, which is a kind of photonic crystal fiber with squeezed lattice or elliptical air holes in cladding. So far there is no a universal concept to describe the squeezed degree. We introduce the concept of the modified squeezing ratio to describe the squeezed degree of the squeezed photonic crystal fibers, and then present a corresponding model. Using this model, we investigate the influence of modified squeezing ratio on the birefringence characteristics of photonic crystal fibers based on the supercell lattice method. Furthermore, it is reported for the first time to our knowledge that the complex influence of the lattice squeezing and the elliptical air holes on the birefringence is discussed.
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