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دراسة نظرية لانتشار نبضة كاوسية في الياف البلورة الفوتونية والعوامل المؤثرة فيها == Theoretical Study of the Propagation Gaussain Pulse in Photonic Crystal Fibers and the Parameters Influencing it
Author name:
دعاء حسين هاشم
Supervisor name:
حسن عبد الله سلطان
General topic:
Physics
Specific topic:
Physics
Degree:
Master
University:
University Of Basrah - College Of Education For Pure Sciences
Language:
Arabic
University location:
Basrah
First pages:
26T1697 - p.pdf
Abstract:
In this thesis the propagation of short Gaussian pulse in Photonic Crystal Fibers (PCFs) are studied, the effect of the fiber parameters on the pulse like the absorption, dispersion and nonlinearity studied also.Nonlinear Schrodinger Equation (NLSE) was solved numerically using the spectral or Split - Step Fourier Method (SSFM) to determine the pulse spatio - temporal evolution.The study includes the effect of the photonic crystal arrangement especially the holes number, hole - hole spacing and holes dimeter on the effective refractive index and the dispersion of the photonic crystal fiber.The Nonlinear Schrodinger Equation (NLSE) was solved using the Finite differences in the frequency domain (FDFD) method.The two zeros dispersion were studied to calculate the zero dispersion wavelength (ZDW) by applying the international golden ratio (1.16180339887) for the ratio of the hole - hole spacing to the holes dimeters.The study shows that the pulse propagation depends strongly on the absorption, dispersion and nonlinearity of the PCF, and the pulse wavelength must be near the ZDW to ensure the propagation with little loses.The dependence of the nonlinear refractive index, the dispersion and the ZDW of the PCF were proved.The study shows that the golden ratio can be used to have two ZDWs, and a new ratio of hole - hole spacing to the hole dimeter equal to 2 can be used to achieve two ZDWs.
