Modeling and simulation of photonic crystal fiber structure for single mode polarization for fiber laser applications

Photonic crystal fibers have attracted increasing interest over the past few years because of their ability to provide manipulation in optical properties of light. High birefringence can be easily achieved in PCFS based on design flexibility and the large index contrast. Amongst several designs high birefringence exceeding 10^-3 has been shown. Birefringence of the PCF can be further improved by employing elliptical air holes in the fiber cladding. In this category of PCFS high birefringence is achieved when the bulk of the mode energy is in the fiber cladding thus high birefringence is often accompanied with poor energy confinement. In this paper an ultrahigh birefringent PCF with ultra low confinement loss is proposed by employing elliptical holes in the fiber core [2] to induce the birefringence but circular holes in the fiber cladding to reduce the confinement loss. Such a design is able to offer is able to offer a perfect solution to the tradeoff between the high birefringence and the confinement loss in elliptical-hole PCFS. MATLAB and COMSOL softwares have been used for the coding and simulation of the problem.