Performance of Fiber with Elevated Refractive Index at Core Axis

Abstract

This paper deals with the performance of Multimode Step Index (MSI) fiber at the bit rate of 40Gbps. A $50 \mu \mathrm{m}$ MSI fiber is designed with the profile of inner core, outer core and the cladding. Instead of analyzing the dip in refractive index at core axis, this paper proposes an idea of slightly elevating the refractive index at core axis. This is simulated by Optifiber software at the wavelength of 1550nm. The dispersion and bend forbearance of designed MSI fiber is analyzed by varying the index difference between core and cladding. Elevated Refractive Index Profile (RIP) with cladding index n clad of 1.40871 provides improved tolerance of macro bending losses at 1550nm and Elevated Refractive Index Profile (RIP) with cladding index n clad of 1.{44871 provides reduced dispersion at 1550nm.The MSI fiber with these Elevated RIPs are applied at the optical communication link at bit rate of 40 Gbps and is simulated using Optisystem simulation software.