Performance study of different step index multi-clad fiber for broadband application

In this paper, the analytical study of the performance characteristics like group delay, effective mode field diameter (MFD) and dispersion curves of an optical fiber having various cladding layers are presented. The proposed six structures of optical fiber have three parts, namely core with highest refractive index dielectric material, inner claddings and outer cladding. The group delay, MFD and dispersion depend on the number of cladding in optical fiber. The zero dispersion wavelengths vary with number of cladding increases or decreases. The guided modes and propagation wave vectors can be evaluated by using a determinant which is constructed by the boundary matched method. The cutoff conditions of modes for varying number of inner claddings are compared. The analysis shows that the propagation property can be controlled of an optical fiber by increasing the number of inner claddings and diameter of the core. These claddings provide a degree of freedom to control the modes and other characteristics of the fiber.