论文部分内容阅读
大模场单模光纤在高功率激光器、高功率光传输和高灵敏度传感器等领域具有重要意义.设计了一种新型超低损耗大模场单模光纤,包层空气孔由掺氟硅玻璃棒代替,掺氟硅玻璃棒排列呈六重准晶体结构.基于有限元法对光纤的传输特性进行了数值模拟.研究了光纤结构参量变化对模式特性和有效模场面积的影响.结果表明:波长在1064 nm处,有效模场面积高达5197μm2,基模的限制性损耗低于10-5dB/km,解决了大模场与低损耗之间的冲突;在1064—2000 nm波段内,基模与二阶模的限制性损耗相差7个量级,实现单模传输;半径为10 cm时,弯曲损耗小于0.01 dB/m,具有良好的低弯曲损耗特性.此光纤能够提高光纤热损伤阈值,减少接续损耗,全固态结构有效避免了空气孔塌陷,简化制备工艺,对高功率激光传输、光纤激光器和光纤放大器的发展具有重要意义.
Large-mode single-mode optical fiber is of great significance in the fields of high power laser, high power optical transmission and high sensitivity sensor, etc. A new type of ultra-low loss large-mode single mode fiber is designed. The cladding air hole is made of fluorine- Instead, the fluorine-doped silicon glass rods are arranged in a quasi-quasi-crystal structure, and the transmission characteristics of the optical fiber are numerically simulated based on the finite element method. The influence of the structural parameter variation of the optical fiber on the mode characteristic and the effective mode field area is studied. At 1064 nm, the effective mode field area is as high as 5197μm2 and the fundamental mode loss is lower than 10-5dB / km, which resolves the conflict between the large mode field and the low loss. In the 1064-2000 nm band, The second-order mode has a limit of seven orders of magnitude difference in single-mode transmission, and the bending loss is less than 0.01 dB / m at a radius of 10 cm, which has good low bending loss characteristics. This fiber can increase the fiber thermal damage threshold and reduce Continued loss, all-solid-state structure to effectively avoid the collapse of the air hole to simplify the preparation process for high-power laser transmission, fiber laser and fiber amplifier development is of great significance.