六边形结构光子晶体光纤的色散特性研究

为解决传统色散补偿光纤补偿带宽小及所需光纤长度大的问题, 利用平面波展开法, 通过改变空气孔孔径及分布周期得到不同结构光纤的色散曲线, 为色散补偿光纤的制作提供理论依据。研究结果表明, 对于普通六边形结构光子晶体光纤, 减小空气孔孔径及增大空气孔分布周期可减小短波段光信号的色散值, 同时长波段光信号色散值随之增大。引入双芯结构后, 在长波段可产生大负色散, 并且通过减小空气孔分布面积能使色散曲线趋于平坦, 可作为宽带色散补偿光纤。

Research on Dispersion Properties of Photonic Crystal Fiber with Hexagonal Structure

The bandwidth limitations and the low dispersion value of conventional dispersion compensating optical fiber make it not conducive to productionof the dispersion compensating optical fiber. In order to solve this problem, using the plane wave method, the dispersion curves of fibers with different structures have been obtained, which gives the theoretical guidance for the production of dispersion compensation fiber. Results show that for the ordinary photonic crystal fiber with hexagonal structure, the dispersion value for short-wave-length optical signal can be reduced and the long one can be increased by reducing the air hole diameter or increasing the air hole interval. Large negative dispersion value can be obtained at long wavelength by using the dual-core structure, and flatten the dispersion curve if reduce the distribution area of the air holes, the fibers with flat dispersion curves can be used as a broadband dispersion compensating fiber.