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提出了一种全固态双层芯结构色散补偿微结构光纤。该光纤以纯石英材料为基底,通过引入一种掺锗高折射率石英柱和两种掺氟/硼的低折射率石英柱,对端面折射率分布进行调节,以形成双芯结构。在对此光纤模式演化及耦合特性理论分析的基础上,利用多极法对其模式耦合位置与强度随光纤结构参数变化的关系进行了分析,对色散特性与光纤结构参数之间的变化关系进行了研究。通过优化光纤结构参数,设计出两种光纤:光纤1在1550nm处色散值达-8465ps/(nm·km),与SMF-28单模光纤熔接损耗仅为1.89dB,可对长度为其500倍的SMF-28单模光纤的色散值进行补偿;光纤2与SMF-28单模光纤的熔接损耗仅为1.41dB,可对长度为其15.5倍的SMF-28单模光纤在C波段的色散值进行补偿,最大残余色散绝对值仅为1.38ps/nm。与石英-空气孔微结构光纤相比,所提出的全固态色散补偿微结构光纤易制备且易与传统通信光纤熔接。
An all-solid two-layer dispersion compensated microstructured fiber with core structure is proposed. The optical fiber is based on a pure quartz material. The refractive index profile of the end face is adjusted by introducing a quartz column with high refractive index of germanium and two kinds of low refractive index quartz column with fluorine / boron to form a dual-core structure. Based on the theoretical analysis of fiber mode evolution and coupling characteristics, the relationship between mode coupling position and intensity with the changes of fiber structure parameters was analyzed by multipole method. The relationship between dispersion characteristics and fiber structure parameters was analyzed Study. By optimizing the fiber structure parameters, two kinds of optical fibers are designed: optical fiber 1 has a dispersion value of -8465 ps / (nm · km) at 1550 nm, a fusion loss of only 1.89 dB with SMF-28 single-mode optical fiber, SMF-28 single-mode fiber dispersion compensation; fiber 2 and SMF-28 single-mode fiber fusion loss is only 1.41dB, the length of its 15.5 times SMF-28 single-mode fiber in the C-band dispersion value To compensate, the absolute maximum residual dispersion is only 1.38ps / nm. Compared with the quartz-air-hole microstructured fiber, the proposed all-solid-state dispersion compensated microstructured fiber is easy to prepare and easy to fuse with the traditional communication fiber.