光的群速度控制一直是重大研究课题之一。基于光纤的超光速和光速减慢带来新的技术突破。简述了超光速和光速减慢技术的发展。提出一种利用光泵浦改变掺铒光纤Bragg光栅中探测光的群速度的方法。推导了系统方程。讨论了光泵浦功率、光纤Bragg光栅长度、掺杂 Er3+离子浓度及光栅折射率调制幅度对群速度的影响。

The group velocity control is one of significant research project. The subluminal and superluminal propagation based on the optical fiber has brought a new technological breakthrough. The development of the subluminal and superluminal propagation is presented.The method to pump the FBG written into an Er3+-doped optical fiber is proposed to decrease or increase the group velocity of a probing pulse. The system equations are derived. The group velocity modification is numerically demonstrated and discussed with the effects of an optical pump power, fiber Bragg grating length, doping concentration of Er3+ions, and modulation amplitude of the grating.