为了补偿光纤色散对高速信号传输的限制, 提出一种全固双层芯色散补偿光子晶体光纤.首先对该光纤模式耦合特性进行理论分析, 然后利用多极法进行模拟计算, 得到该光纤包层结构参数与色散值以及相位匹配波长之间的关系, 并对其规律进行研究.通过优化光纤结构参数, 得到在1 550 nm处, 色散值达到-32 620 ps/(nm·km)、损耗为0.29 dB/km、与标准单模光纤的熔接损耗为4.77 dB的色散补偿光纤.该光纤可补偿1 910多倍长度的SMF-28单模光纤的色散, 补偿能力远大于常规色散补偿光纤.与空气孔-石英结构色散补偿光子晶体光纤相比, 全固色散补偿光子晶体光纤具有易制备、易与传统通信光纤熔接等优点.

In order to compensate the transmission limits of the high-speed signal caused by dispersion of the fiber, an all-solid dual-concentric-core photonic crystal fiber for dispersion compensation was proposed. Firstly, the mode coupling characteristics of the fiber was theoretically analyzed, and then multipole method was used to calculate the relationship between the parameters of the fiber and the dispersion value as well as the shift of phase matching wavelength, and the regularity was studied. Finally a dispersion compensating fiber with dispersion value of -32 620 ps/(nm·km) at 1 550 nm was achieved by optimizing the structural parameters of fiber, and numerical results also show that the loss is 0.29 dB/km and the splicing loss with SMF-28 fiber is 4.77 dB at 1 550 nm. The fiber can compensate 1 910 times the length of the SMF-28 single-mode fiber dispersion, its compensation ability is much larger than the conventional dispersion compensation fiber. The all-solid dispersion compensating photonic crystal fiber has the advantages of easy to fabricate and easy to splice with the traditional communication fiber compared with air-silica photonic crystal fiber.