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研究了任意形状应力区的光纤在纤芯中心处的应力场分布和双折射大小计算方法,并对领结光纤进行了优化设计。采用COMSOL Multiphysics软件中的固体力学模块,研究了相同应力区面积、不同形状的应力型光纤在纤芯中心处的应力场大小。结果表明,软件仿真值与运用微元应力积分公式计算得到的结果一致。因此对于任意形状应力区光纤在纤芯中心处的应力场分布与双折射可以直接运用解析公式求解。通过对相同应力区面积的不同类型光纤的应力微元分析,发现领结光纤在纤芯处的双折射并非最大,这与惯常认为的领结光纤双折射最大的结论相反。由此,对领结光纤重新进行了优化设计,得到了具有更大双折射的“月牙形”光纤。
The stress field distribution and birefringence calculation of the fiber in the stress zone of arbitrary shape are studied. The bowtie fiber is optimized. The solid mechanics module in COMSOL Multiphysics was used to study the stress field in the center of the core of stress-type optical fiber with the same stress area and different shapes. The results show that the software simulation values are consistent with those calculated by using the stress integral formula of microdimensions. Therefore, the stress field distribution and birefringence of the core in the stress zone of arbitrary shape can be directly solved by the analytic formula. By analyzing the stress microdot analysis of different types of optical fibers with the same stress zone area, it is found that the birefringence of the bowtie fiber is not the maximum at the core, which is contrary to the conventional conclusion that the maximum of the bowtie fiber birefringence is. As a result, the bowtie optical fiber was re-optimized design, has been more birefringence “crescent ” optical fiber.