^aDept. of Electrical and Electronic Engineering, Ahsanullah University of Science and Technology, Dhaka-1208, Bangladesh

^bDepartment of Computer Science, Cihan University Sulaimaniya, Sulaimaniya 46001, Kurdistan Region, Iraq

^cDepartment of Laser and Optoelectronic Engineering, Al–Nahrain University, Baghdad, Iraq

^dDepartment of Biochemistry, College of Science, King Saud University, P.O.

Box: 2455, Riyadh 11451, Saudi Arabia

^eDepartment of Electrical and Computer Engineering, University of Saskatchewan, 57 Campus Drive, Saskatoon, SK S7N 5A9, Canada

^fGroup of Bio-photomatiχ, Department of Information and Communication Technology, Mawlana Bhashani Science and Technology University, Santosh, Tangail-1902, Bangladesh

A gallium phosphide (GaP) based photonic crystal fiber (PCF) with hexagonal air hole arrangements is introduced in this study that reveals high birefringence (Br) and nonlinear coefficient (NLC). Numerous optical properties, such as birefringence, nonlinearity, dispersion, confinement loss, effective area, core power fraction, etc. are studied by fine- tuning the geometrical variables, applying the finite element method (FEM). The numerical analyses demonstrate that an ultra-high Br of 59.1 x 10__2 and NLC of 2.37 x 105 W__1 km__1 with a large negative dispersion of __3875.21 ps. nm__1 . km__1 can be accomplished at the wavelength of 1.55 μm. Consequently, the developed PCF can be applied in a plethora of intriguing applications, including supercontinuum generation, telecommunications, etc.