The Research Of The Controllable Group Velocity In The Tm³⁺-doped Optical Fiber Medium At Room Temperature

The slow and superluminal light are two kinds of group velocity in optical transmission material. Exploration and measurement of the speed of light is very valuable and very considerable development potential, such as optics, material science, modern communications category as popular of exploration. However, the slow and superluminal light phenomenon is a new exploration object, there are disadvabtages at the perspectives of theory, experiment, practical application and so on. For understanding the process of light pulse propagation in mediums with ultraslow and fast group velocity, we introduced the concept of group velocity, dispersion relation, and then we demonstrated the basic principle of coherent population oscillation technology. The feasible analysis of contollable group velocity in erbium-doped fiber was discussed emphatically, while the model of the propagation of light pulses through an erbium-doped fiber was developed and the simulation results were given accordingly, to guide the experimental research and to provide theoretical proof for light cache technology research and development.Analyzed the influence factors of slow light in the thulium doped fiber. When the different length, discuss the relationship between modulation frequency and the time delay under different incident signal light powers in thulium-doped optical fiber; When the different signal light, discuss the relationship between modulation frequency and the time advance under different pump light powers;influences of the erbium ion density to group velocity are analyzed.Analysis, increasing the fiber length and the input intensity can be used as a control parameter to increase the fractional delay; Superluminal saturation effect, increasing the input intensity and the pump light power can be used as a control parameter to increase the fractional advance; The erbium ion density impact on group velocity of light.