光纤Bragg光栅的慢光特性

摘要

研究了光栅长度和光栅周期对光纤Bragg光栅慢光的影响，并重点分析了优化后的慢光特性。结果表明：随着光栅长度的增大，慢光时延量整体呈现不断递增的趋势，且幅度较大，其慢光谱谐振峰两边的旁瓣加强，谱底变得非常平坦，但随着光栅周期的增大，慢光群时延量却呈现出递减的趋势，优化参数后得到了群速度为c/98的慢光。这些规律为设计新型的光纤Bragg光栅的慢光延迟器件提供理论参考。%The influence of grating length and grating period on slow light of fiber Bragg gratings was investi-gated and slow light after optimizing the parameters was presented emphatically. The results indicate that the slow light delay increases with grating length increasing and the degrees of the increasing. A certain bandwidth of reso-nance peaks on both sides of the side lobe and the peak top becomes extremely flattened. But the slow light delay decreases with grating period increasing. By optimizing the parameters,the maximum group velocity can be slowed to c/98. This provides theoretical basis for designing the slow light devices based on fiber Bragg gratings.