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 1.55μm. In addition, the highest birefringence of the proposed PCF at 1.55 μm is 1.92 x 10-2 and the value of birefringence from the wavelength of 1.26 to 1.8 μm (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 10-3 dB/km at 1.55 μm with seven fiber rings of air holes in the cladding.