Design of a high-birefringence photonic crystal fiber using an asymmetric defect in the fiber core

Abstract

We numerically investigated a high birefringence photonic crystal fiber (PCF) which consists of the circular air holes in fiber cladding and a rotational ring of elliptical air holes in fiber core. Four different patterns (i.e., case A-D) of PCF structures have been investigated for comparison. The birefringence and mode field area of these PCFs have been numerically estimated by employing a finite element method (FEM). An endlessly single mode, high birefringence (~7.6×10 -3 ) is found at the excitation wavelength of λ=1550 nm. The merit of the designed PCFs is that their optimum birefringence can be easily achieved by introducing the rotational elliptical air holes in the fiber core region.

Design of photonic crystal fiber with large mode area for flat-top mode generation

“…The doped lattices in this design use this shape. A layer of densely arranged oval pores surrounding the quartz crystal can be used as the core [20]. It is used to achieve the required mode field and larger modal area.…”