光群速度调控，即快慢光效应，不仅仅调控光速，更重要的是能对折射率及光传输位相进行有效调控，因此可为光学非线性效应及其位相匹配提供一种全新调控手段，这也为快慢光开拓新应用提供了基础。本项目提出利用不同机制的快慢光效应，特别是利用光纤宽带受激布里渊散射或拉曼散射及光纤光栅中的快慢光效应，研究光速调控对光的传输位相和色散的调控及其限制因素。重点对光纤中四波混频、共振辐射及禁带非线性效应等现象的实现开展前瞻性研究，探索高效率任意波长宽带波长转换的新方法和新技术。重点探索光纤中快慢光调控位相匹配的反向切伦科夫辐射和负频共振辐射的产生新方法，这两类现象需要实现宽带的位相匹配，一般非线性相移难以满足位相匹配条件，因此提出通过群折射率调控实现宽带位相匹配的苛刻条件，实现这两类非线性辐射现象的高效率产生。本项目研究在非线性光学，全光信号处理及激光频率变换等领域中具有重要的应用前景和物理意义。

Controlling the group velocity of light, ie, fast/slow light effects, does not only manipulate the light speed, but also controls the group refractive index and the propagation phase. Thus, it is provide a new way to realize the phase-matching in the optical nonlinear effects. This is the base for the applications of fast/slow light effects. This project is to utilize different mechanism of fast/slow light effects, and to manipulate the propagation phase and dispersion under various light group velocities and their limitation factors under SBS, SRS or in the fiber gratings. The key issues are to realize the backward Cherenkov radiation, negative-frequency resonant radiation, nonlinear effects in photonic gaps under phase-matching with controlling the group velocity. These two nonlinear processes always need the extreme experimental conditions for phasing matching. Controlling the group velocity of light provide a new method for the physical base and technology. We believe that this project may be found the applications on the generation of nonlinear effects, all-optical signal processing, and the change of laser frequency.