The Influence Of Geometirc Parameters On Slow Light Via Stimulated Birllouin Scattering In Photonic Crystal Fibers

With the increasing demanding of wide bandwidth, all-optical switching and routing areneeded in the future telecommunication systems. The key issue of realizing such a thing is tostore light. Recent years, many people have studied store light technology via verious slowlight technology, which prove that stimulated brillouin scattering via optical fibers can controllight efficiently. photonic crystal fiber, as a two-dimensional photonic crystal, has attracted alot of attentions since it is born. It has remarkable advantages in controlling and handling lightcompared with conventional optical fibers．Because of their designable microsructure，photoniccrystal fiber exhibit some unique characteristics in optical nonlinear effects，especially instimulated brillouin scattering．Slight differences in microstructures may result in great changesin nonlinear effects，or even may take in some wholly new phenomenon．Reasonable design ofmicrostructure will inhibit or enhance nonlinear effects in photonic crystal fiber，which greatlyexpands the application fields of nonlinear effects．In this paper, the coupling equations of SBS are solved numerically with Characteristicsformula and fourth-order Runge-Kutt formula. The main conclusions are as follows:1.The influence of core size and different Stokes pulse width on pulse broadening andtime delay are investigated in condition of the different Stokes power and the same intensity.Itwas found that the smaller the core is the bigger the time delay, but with larger pulsebroadening.2.The influence of pulse time delay and broadening on small core photonic crystal fiberand single mode fiber are investigated in condition of different width of Stokes wave. It isfound that the narrower the stokes pulse width is, the larger the relative time delay. For Stokeswave width of60ns, the time delay for small core PCF is100.8ns,the relative time delay is1.68,which surpass the120ns width Stokes wave with its time delay equals115ns,and relativetime equals0.95.3.The influence of different ratio d/L of smaller core photonic crystal fiber on time delayand pulse broadening factor are also investigated. We found that the smaller the ratio d/L is,the larger the time delay, with larger pulse broadening factor.