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研制出一种新型抗弯曲大模场面积石英光子晶体光纤.利用光子晶体光纤结构设计的灵活性,通过规划缺陷的位置及空气孔的尺寸,实现了大模场面积单模及低弯曲损耗特性.应用建立的实际光子晶体光纤特性分析模型,研究了研制光纤的模式特性和弯曲特性,在波长1064nm处,平直状态下光纤的模场面积可以达到2812μm2,基模限制损耗为0.00024dB/m,高阶模限制损耗高于1.248dB/m.基模和高阶模之间的高传输损耗差,保证了在获得大模场面积的同时实现单模传输.弯曲半径和弯曲方向角所带来弯曲损耗变化的研究结果显示,即使在弯曲半径小到5cm时,弯曲损耗也在103dB/m量级以下,而且在弯曲半径为30cm时光纤可承受的弯曲方向角范围扩展至60—60.研制的光纤具有良好的低弯曲损耗特性,可有效解决非对称结构所带来的光纤弯曲特性对弯曲方向角敏感的问题.该光纤在高功率光纤激光器、放大器及高功率传输等技术领域具有重要的应用价值.
A new type of flexural large mode area quartz crystal photonic crystal fiber is developed.Using the flexibility of photonic crystal fiber structure design, the size of single mode and low bending loss of large mode field area is achieved by planning the position of defect and the size of air hole The model property and bending property of the developed optical fiber are studied by using the model of the actual photonic crystal fiber. The mode field of the fiber can reach 2812μm2 at flat wavelength and the limiting loss of fundamental mode is 0.00024dB / m , The high-order mode limit loss is higher than 1.248dB / m. The high transmission loss difference between the fundamental mode and the high-order mode ensures the single-mode transmission while obtaining the large mode field area. The change of bending loss caused by the bending radius and the bending direction angle Showed that the bending loss was below 103 dB / m at a bending radius as small as 5 cm and that the bending direction angle range the fiber could withstand was extended to 60 to 60 at a bending radius of 30 cm. The developed optical fiber had Good low bending loss characteristics can effectively solve the asymmetric structure of the fiber bending characteristics of the bending angle sensitive to the problem of the fiber in the high-power fiber-excited Optical, amplifiers and high-power transmission technology has important application areas.