الفهرس 
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Abstract
This work is a theoretical study in the course of improving the performance of the optical fibers near fild distribution, propagation constant and dis persion characteristics of nonlinear single mode opticalfibers have been invesstigated Shooting method technique is use and implemented into a computer code for both profiles of step index and graded index fibers an error function is defined to estimate the discrepancy between the between the expected electric field radial derivative at the core cladding interface and that obtained by numerically integrating the wave equation through the use of runge kutta method.