Study Of Slow Light Based Stimulated Brillouin Scattering In Optical Fiber

The theory on slow light has been studied for many years. With some experiment results in recent years, considerable interest has been attracted to the field. On the one hand, the phenomenon exist inviting application prospect, on the other hand, that involve significant basis theory. The study will not only deepen our understanding to the essence of light interacting with matter, but also can be used for optical switching, optical storage and slow light and so on.Early slow light research usually has used electromagnetically induced transparency (EIT) or coherent population oscillations (COP). But these two methods need to use expensive experiment instruments and be realized only in some special gas or crystal for certain wavelength. So it is difficult in practice. To overcome these disadvantages and make the study on slow light become more practical, slow light can be achieved by use of nonlinear-effects on fiber in this article. And mainly the process of slow light via stimulated Brillouin scattering (SBS) is analyzed. The primary achievements are as follows:1 The latest developments and significance of research on controllable slow light are reviewed. Advantages and disadvantages of these kinds of technologies are discussed. The physical principle of slow light and methods of achieving slow light via stimulated Brillouin scattering in optical fibers are studied.2 Steady state of SBS is analyzed by shooting method and Runge-Kutta method on the basis of coupling equations. And the process to achieve slow light under steady state is discussed. The SBS threshold changed along with the loss of fiber. The effect of pump wave power and the length of fiber and stokes wave power on slow light were analyzed.3 Shooting method, Runge-Kutta method and split-step Fourier method are used in Mtalab simulation on the basis of the numerical study in this subject. The effect of Brillouin gain on optical time delay is discussed. Mainly the effect of gain saturation on slow light is analyzed and the effect of dispersion on the waveform of output pulse is discussed with pulse time delay.4 The characteristic of spontaneous Brillouin scattering is studied. The frequency spectrum of spontaneous Brillouin scattering is analyzed. And the experiment is made. After the analysis of experimental results, the existing problems are summarized and the solutions are proposed.