环绕空气孔结构的双模大模场面积多芯光纤的特性分析
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  • 英文篇名:Dual-mode large-mode-area multi-core fiber with circularly arranged airhole cores
  • 作者:靳文星 ; 任国斌 ; 裴丽 ; 姜有超 ; 吴越 ; 谌亚 ; 杨宇光 ; 任文华 ; 简水生
  • 英文作者:Jin Wen-Xing;Ren Guo-Bin;Pei Li;Jiang You-Chao;Wu Yue;Shen Ya;Yang Yu-Guang;Ren Wen-Hua;Jian Shui-Sheng;Key Laboratory of All Optical Network and Advanced Telecommunication Network of the Ministry of Education, Beijing Jiaotong University;Institute of Lightwave Technology, Beijing Jiaotong University;
  • 关键词:多芯光纤 ; 双模特性 ; 模场面积 ; 弯曲损耗
  • 英文关键词:multi-core fiber;;dual-mode characteristic;;large mode area;;bending loss
  • 中文刊名:WLXB
  • 英文刊名:Acta Physica Sinica
  • 机构:北京交通大学全光网络与现代通信网教育部重点实验室;北京交通大学光波技术研究所;
  • 出版日期:2016-12-20 08:33
  • 出版单位:物理学报
  • 年:2017
  • 期:v.66
  • 基金:国家杰出青年科学基金(批准号:61525501);; 国家自然科学基金(批准号:61178008,61275092,61405008)资助的课题~~
  • 语种:中文;
  • 页:WLXB201702024
  • 页数:8
  • CN:02
  • ISSN:11-1958/O4
  • 分类号:200-207
摘要
将多芯光纤与无芯空气孔结构结合,设计了一种具有大模场面积的十九芯双模光纤结构.该结构由位于中心的5根常规纤芯及环绕其周围的14根空气纤芯按正六边形排布构成,能实现稳定的双模传输,其基模有效模场面积的最小值约为285.10μm~2.系统地分析了影响模式传输特性和模式有效模场面积的结构参数:纤芯间距、相对折射率差和纤芯大小.通过对这三个参数的优化,在双模传输的条件下,增大基模的有效模场面积.此外,具有大模场面积的多芯双模光纤结构具有良好的抗弯曲特性,基模弯曲损耗小于5×10~(-5)dB/m.该结构还具有制作简单、设计灵活等优点,适用于高功率光纤激光器和光纤放大器.
        Multi-core fiber has aroused considerable interest as one of potential candidates for space division multiplexing that provides an additional freedom degree to increase optical fiber capacity to overcome the transmission bottleneck of current single-mode fiber optical networks.Few-mode fiber is also under intense study as a means to achieve space division multiplexing.We propose a novel dual-mode large-mode-area multi-core fiber(DMLMAMCF),which uses multi-core structure to realize few-mode condition when pursuing large mode-area.The proposed fiber consists of 5conventional silica-based cores in the center region and 14 air hole cores surrounding the center cores.The outer circle with 12 air hole cores,which function similarly to the fluorine doping region in the bend-insensitive fiber,can mitigate the bending loss when keeping large mode area.The symmetrically distributed two cores on both sides of the center core in central region can reduce the half second-order LPn mode consisting of two degenerate HE_(11) modes,TE_(01) mode,two degenerate HE_(21) modes and TM_(01) mode,thus leading to the remaining four vector modes,i.e.two degenerate HE_(11)modes and two degenerate HE_(21) modes.That is the reason why we call it strict dual-mode.We focus on large-mode-area properties and bending characteristics of the dual-mode.The influence of structural parameters that include corepitch A,refractive index difference between core and cladding An,and fiber core radius a,on mode characteristics and mode area of HE_(11) mode and HE_(21) mode is investigated in detail.The results reveal that it is helpful to increase the effective area of fundamental mode when we increase the value of corepitch,reduce the refractive index and fiber core radius.The effective mode area of HE_(11) is about 285.10 μm~2 under the strict dual-mode condition.In addition,the relationship between bending loss and bending radius,and the relationship between effective mode area and bending radius of two modes are both investigated.For the HEu mode,the least bending loss is about 5 × 10~(-5) dB/m while the least effective mode area with bending radius larger than 0.6 m is about 285.10 μm~2.The HE_(21) mode is more sensitive to bend effect.The least bending loss is about 0.028 dB/m and the effective mode area is larger than 280.00 μm~2 except for resonant coupling points.Large effective areas of both modes with low bending loss can be realized.Larger effective mode area with larger corepitch,appropriate refractive index difference and fiber core radius can be achieved.This fiber may find its usage in high power fiber lasers and amplifiers.
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