Abstract
A study of the influence of the parameters design, such as the refractive index of the core, the cladding and the radius of the core on propagation constant (β) of single-mode optical fiber in optical communication region (1.2-1.6) m have been investigated. Material, waveguide, and profile dispersions are analyzed and investigated. Three models of optical fibers with different relative refractive indices () (0.004, 0.007, 0.01) at a wavelength equal 1.55 m, and three models of core radius (3,4,5) m is taken in the count. Numerical simulations and modeling are arranged depending on weakly guiding approximation for solving homogeneous wave equation derived from Maxwell’s equations. Our modeling solved by the aid of MATLAB software. Material and profile dispersion have no significant change for various relative refractive index, while waveguide dispersion is affected by the change of relative refractive index. the waveguide dispersion increased by increasing core diameter and the profile dispersion decreased as the core diameter increased. There is no effect on martial dispersion by increasing the core diameter.
Highlights
Step IndexThe step-index fiber is represented by cylindrical waveguide dielectric core that is surrounded by the cladding
The variation in relative refractive index exerts a strong influence on propagation within the singlemode optical fiber and has to be taken into account during the investigating dispersion
We have used three equation to calculate the types of dispersion, namely, material dispersion, waveguide dispersion, and profile dispersion
Summary
The step-index fiber is represented by cylindrical waveguide dielectric core that is surrounded by the cladding. This fiber has a core refractive index higher than the cladding refractive index and radius (a). Single-mode step-index fiber has a very small central core of diameter which is between (2-10)μm , being very small, this diameter leads to one path for light rays through the cable while there is more than one path for light ray in multimode as shown in figure 1. It is suitable to define the effective refractive index for single-mode fiber as a ratio propagation constant of the fundamental mode to that of the wavenumber as shown in equation (6) [3]. There are many types of dispersion: 1- Material dispersion 2- Waveguide dispersion 3- Profile dispersion
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