| Structure dispersion is primary and material dispersion and wave-guide dispersion can be neglected, when wave of input optical pulse is close to verge outside the stop-band in Fiber Bragg Gratings, at the upside part of dispersion curve, optical pulse can come into being Bragg solitons by a careful control of SPM, XPM and GVD.In this paper, effects of dispersion decreasing and loss on transmission of Bragg solitons are analyzed by simulating transmission of Bragg solitons with the finite-difference scheme. Firstly, basic transmission equation of transmitted light is given using coupled-mode theory in Fiber Bragg Gratings and physics meaning of every parameter is given. Secondly, linear and nonlinear dispersion curses of Fiber Bragg Gratings are studied and we analyze formative mechanism of Bragg solitons. Thirdly, formation and interaction of Bragg solitons in uniform Fiber Bragg Gratings are simulated with the finite-difference scheme. According to the numerical results, Bragg solitons can be formed on a certain peak power, In this section, we also can find that interaction of Bragg solitons is repulsive or attractive, when the interval increases. In the fourth section, through computer simulation, effects of dispersion decreasing and loss on transmission of Bragg solitons are analyzed qualitatively. The results show that dispersion decreasing and loss of Fiber Bragg solitons take contrary action on the transmission of Bragg solitons and they make Bragg solitons transmitting stably in Fiber Bragg Gratings. Lastly, the works done by author were concluded.
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