偏芯光纤弯曲特性分析

根据光纤传输理论建立了偏芯光纤理论计算模型.采用保角变换方法将偏芯光纤不对称的三层结构转换成同轴对称的三层结构,得到关于传播常量的特征方程,给出了偏芯光纤弯曲损耗公式.仿真分析了偏芯光纤弯曲损耗和弯曲半径之间的关系,结果表明当弯曲半径达到3mm时,弯曲损耗几乎为零,同时得到弯曲损耗随偏芯距离的变化关系.运用Rsoft软件中的BeamPROP模块建立偏芯光纤弯曲的光学模型,模拟仿真了弯曲的偏芯光纤中模场分布情况.仿真结果表明,偏芯光纤的弯曲方向与纤芯偏移中心轴线方向相同的弯曲损耗小于反方向的弯曲损耗.

Bendind Characteristics Analysis of Eccentric Core Optical Fiber

A theoretical model of the eccentric core fiber was established based on traditional optical transmission theory.By using conformal mapping,the asymmetric three-layer structure of the eccentric core fiber was converted into a three-layer structure of coaxial symmetry.Characteristic equation about propagation constant was obtained.Bending loss formula of eccentric fiber was given.The relationship between bending loss and bending radius of the eccentric fiber was analyzed by simulation.When the bending radius reaches 3 mm,the bending loss is almost zero.Meanwhile,the relationship between bending loss and eccentricity distance change was obtained.Optical model of eccentric fiber bending was established by using BeamPROP module in Rsoft software.Mode field distribution in the curved eccentric core fiber was simulated.The simulation result shows that bending loss of the eccentric optical fiber in the same direction as that of the core deflection center axis is smaller than that of the opposite direction.