CAJ | 학술논문

偏芯光纤由于纤芯偏离中心轴线，其光纤传输特性与传统光纤不同。本文对常用的光纤传输特性数值模拟方法及其优缺点进行了分析比较，确定采用光束传播法对偏芯光纤的光传输特性进行研究。建立了偏芯光纤的理论计算模型，分析了偏芯光纤对应的模场分布特性。推导出偏芯光纤倏逝波的表达式，当纤芯距离包层外表面非常近或贴近外表面时，可利用倏逝波进行光学传感。运用 RSoft 软件中的 BeamPROP 模块对偏芯光纤进行了光学结构建模。基于光束传播法，对偏芯光纤中的模场特性及光功率特性进行了仿真分析，并得到了基模有效折射率和双折射与偏芯距离的变化关系。
편심광섬유우섬심편리중심축선，기광섬전수특성여전통광섬불동。본문대상용적광섬전수특성수치모의방법급기우결점진행료분석비교，학정채용광속전파법대편심광섬적광전수특성진행연구。건립료편심광섬적이론계산모형，분석료편심광섬대응적모장분포특성。추도출편심광섬숙서파적표체식，당섬심거리포층외표면비상근혹첩근외표면시，가이용숙서파진행광학전감。운용 RSoft 연건중적 BeamPROP 모괴대편심광섬진행료광학결구건모。기우광속전파법，대편심광섬중적모장특성급광공솔특성진행료방진분석，병득도료기모유효절사솔화쌍절사여편심거리적변화관계。
The propagation characteristics of eccentric core optical fiber are different from the conventional optical fiber. The numer?ical simulation method is analyzed and its advantages and disadvantages of the optical fiber′s propagation characteristics are com?pared then the Beam Propagation Method is adopted to study the propagation characteristics of eccentric core optical fiber. The the?oretical calculation model of eccentric core optical fiber is established and its mode field distribution characteristics are analyzed. The expression of evanescent wave of eccentric core optical fiber is deduced. It is shown that the evanescent wave can be used in optical sensing when the fiber core is close to the cladding. The BeamPROP module in the RSoft software is used to model the opti?cal fiber structure. Based on the beam propagation method the mode field characteristics and optical power characteristics of the ec?centric core optical fiber are simulated then the relationship between the effective refractive index of the base model as well as the birefringence index and the core shift distance.