低弯曲损耗大模场面积多芯光纤的研究  

Research of Large Mode Area Multi-core Fibers with Low Bending Loss

作　　者：巩玲仙[1,2] 王春灿[1,2] 陈雪[1,2] 许丽丽[1,2] 尚玉美[1,2] 

机构地区：[1]全光网络与现代通信网教育部重点实验室北京交通大学,北京100044 [2]北京交通大学光波技术研究所,北京100044

出　　处：《光电技术应用》2012年第5期36-39,46,共5页Electro-Optic Technology Application

基　　金：国家自然科学基金项目(60771008;60837002)

摘　　要：针对19芯、37芯大模场光纤提出两种降低弯曲损耗的方法,一种方法是在芯区外引入一层空气孔,另外一种方法是在芯区外引入多包层低折射率结构。理论分析表明,多芯光纤弯曲损耗存在临界弯曲半径,在大于临界半径的情况下,弯曲损耗基本不变,在小于临界半径的情况下,弯曲损耗急剧增大。引入空气孔后,当19、37芯光纤模场面积分别为516μm2和920μm2时,临界弯曲半径都从3.5 cm减小到4 mm。当引入包层数达三层以上时,多包层结构也可使19、37芯光纤的临界弯曲半径从3.5cm减小到4 mm。Two methods are proposed to decrease the bending loss of 19-core and 37-core large mode area fibers. The first approach is to introduce a ring of air holes around the cores. The second approach is to introduce cladding lays with the lower refractive index. The numerical simulation shows that there is a critical bend radius in the multi-core fibers and the variation of bending loss is small when the bend radius is bigger than the critical radius. But the bending loss increases sharply when the bend radius is smaller than the critical radius. In the cases of 19-core and 37-core fibers with air holes, the critical radius both decreases from 35 mm to 4 mm with mode field area of 516 μm2 and 920 μm2. The critical bend radius of the 19-core and 37-core fiber both decreases from 35 mm to 4 mm with three or more claddings of the low refractive index.

关 键 词：弯曲损耗 多芯光纤 大模场 空气孔 

分 类 号：TN929.1[电子电信—通信与信息系统]