为了优选宏弯损耗敏感光纤，研发基于光纤宏弯损耗的光学器件，对影响单模光纤宏弯损耗的主要因素进行了理论分析和仿真研究。基于D.Marcuse和H.Renner提出的光纤宏弯损耗理论模型，选取SMF28、SMF28e 和1060XP三种单模光纤，仿真研究了涂覆层、弯曲半径、光源波长、MAC值和弯曲圈数对光纤宏弯损耗性能的影响。结果表明：无涂覆层、带吸收层的单模光纤宏弯损耗随着波长增长而增大、随着弯曲半径增大而减小、随着圈数增多而增大、随着MAC值增大而增大；光纤的丙烯酸酯类涂覆层会引起宏弯损耗随弯曲半径变化发生振荡；MAC值是衡量光纤宏弯损耗敏感性能的指标，也是优选宏弯损耗敏感光纤的重要参数。因此，光纤宏弯损耗器件适合选用MAC值大的光纤，去除其涂覆层，增加吸收层，然后选择较长的波长、较小的弯曲半径和适当多的弯曲圈数。%In order to select fibers which are sensitive to macrobending loss,optical devices based on optical fiber mac-robending loss are developed,and the main factors affecting macrobending loss of single mode fibers are analyzed theo-retically and simulated.Simulation study is carried out to investigate the impact of coating layers,bend radius,light wavelength,MAC value and the number of bend turns on the macrobending loss of optical fiber,based on two theoreti-cal models of a bend fiber with a core-infinite cladding structure and a bend fiber with a core-cladding-infinite coating layer structure,which are developed by D.Marcuse and H.Renner,respectively.The three types of fibers chosen for the simulation research are Corning SMF28,Corning SMF28e and Nufern 1 060XP single mode fiber.Results show:(i) The macrobending loss of a single mode fiber with a core-infinite cladding structure increases with increase of wave-length,decrease of bend radius,increase of bend turns and increase of MAC value;(ⅱ)Oscillation phenomena of macrobending loss for a fiber are induced by the coating layers such as acrylate;(ⅲ)MAC is one parameter to affect the inherent macrobending loss performance of a fiber,while MAC value is the key parameter to reflect the inherent macrobending loss performance,as well as an important parameter to select a fiber that is sensitive to bend loss.Therefore,optical devices based optical fiber macrobending loss are suitable to choose single mode fibers with large MAC value,long wavelength,small bend radius,more bend turns,and especially a core-infinite cladding struc-ture,which is realized by removing the coating layers and adding an absorption layer.
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