Dependence Of Photonic Crystal Fiber Structures On Stimulated Brillouin Scattering Slow Light And Applications

In recent years, with the increasing development of the high speed and capacity optical communication system, high-performance optical router and buffer are becoming the key technologies for all-optical networks. Slow light technology based on stimulated Brillouin scattering(SBS) has many advantages, such as operating at room temperature, compatible with operating communication system, flexible tailoring time delay and so on. So it has great potential in applications. Photonics crystal fiber (PCF) is a type of two-dimensional photonic crystal with center defect. Because of its unique and excellent properties, photonic crystal fiber is paid much attention in recent years. The optimum designed PCF has larger nonlinear effect and tailored dispersion. These characteristics show that the PCF is an better medium for SBS slow light.In this paper, the three waves coupled equations of stimulated Brillouin scattering are solved numerically by using finite difference time domain method. We discussed the influence of the air-hole-fill on the delay time and broaden factor. The results show that the delay time increases and the broaden factor decreases with increase of the air-hole-fill. They have linear change as the pitch of PCF keeps as constant. The change of air-hole-fill fraction has less effect on delay time and broaden factor for a given diameter of core. Furthermore, the broaden factor of pulse caused by SBS in small core PCF is studied. The results show that it is more accurate by root mean square broadening than full width at half maximum broadening. Pulse broadening induced by spectrum amplitude is the main reason for broadening of delay pulse.At last, a kind of PCF filled with the toluene which is high thermal sensitive liquid is designed, the PCF guide light through the photonic bandgap effect. The effective refractive index and Brillouin frequency shift of PCF is simulated by the finite element method. The results show the Brillouin frequency shift coefficient is2.215MHz/℃which is larger than conventional fibers. The results provide theoretical basis to design novel Brillouin temperature sensors.