Highly Birefringent and Dispersion Compensating Photonic Crystal Fiber Based on Double Line Defect Core

We propose a highly birefringent and dispersion compensating photonic crystal fiber based on a double line defect core. Using a finite element method (FEM) with a perfectly matched layer (PML), it is demonstrated that it is possible to obtain broadband large negative dispersion of about -400 to -427 ps/(nm.km) covering all optical communication bands (from O to U band) and to achieve the dispersion coefficient of -425 ps/(nm.km) at 1.55 mu m. In addition, the highest birefringence of the proposed PCF at 1.55 mu m is 1.92 x 10(-2) and the value of birefringence from the wavelength of 1.26 to 1.8 mu m (covering O to U bands) is about 1.8 x 10(-2) to 1.92 x 10(-2). It is confirmed that from the simulation results, the confinement loss of the proposed PCF is always less than le dB/km at 1.55 mu m with seven fiber rings of air holes in the cladding.