Loss characteristics of helical-core fiber  

作　　者：王会司 关春颖 高迪 史金辉 苑立波 

机构地区：[1]College of Science,Harbin Engineering University

出　　处：《Optoelectronics Letters》2012年第4期280-283,共4页光电子快报（英文版）

基　　金：supported by the National Natural Science Foundation of China(Nos.11104043,61107069,60927008);the Natural Science Foundation of Heilongjiang Provincein China(No.LC201006)

摘　　要：A special optical fiber is investigated, which has a helical core in the cylindrical cladding. The beam propagation method （BPM） is used for analyzing the impacts of the geometric and physical parameters on the properties of mode losses of the helical-core fiber. The propagation loss is 0.32 dB/m for the fundamental mode and the propagation loss is 20.95 dB/m for the LPu mode in the wavelength range of 1050-1065 nm when the core diameter is 19 μm, the pitch of the core＇s helix is 2.66 mm, and the offset of the helix core from the center of the fiber axis is 31 μm. The core diameter of the single-mode helical-core fiber well exceeds that of the conventional large-mode-area fiber. The helical-core fiber can provide the effec- tive large-mode-area single-mode operation without coiling fiber or selecting excitation mode.

关 键 词：Beam propagation method Optical fibers Core diameters Excitation mode Fiber axis Fundamental modes Large mode area fiber Loss characteristics Mode loss Physical parameters Propagation loss Single mode Single mode operation Special optical fibers Wavelength ranges 

分 类 号：TN253[电子电信—物理电子学] TU991.24[建筑科学—市政工程]