Design of Photonic Crystal Fiber with a rectangular core using Comsol

Abstract-Photonic crystal fibers (PCFs) have attracted a lot of interest because of their special optical characteristics and possible uses in a number of industries, including sensing, medical imaging, and telecommunications. Here, we report on a thorough examination of a newly developed PCF structure with a rectangular core that was simulated with the aid of the COMSOL Multiphysics software. In comparison to conventional circular core fibers, the suggested PCF design has a rectangular core geometry, which offers advantages in terms of greater flexibility in adjusting light propagation properties. We examine the modal properties like Birefringence, Effective Area and confinement losses of the rectangular-core PCF over a broad wavelength range using comprehensive numerical simulations performed with COMSOL. Regarding the viability and efficiency of the rectangular-core PCF architecture, our results show encouraging trends. Its potential usefulness for applications requiring customized optical features is suggested by the strong modal confinement and low dispersion properties we see within the relevant spectral range. All things considered, this work opens the door for the creation of sophisticated optical fibers with improved performance and adaptability by offering insightful information on the design and optimization of photonic crystal fibers with rectangular cores using COMSOL.