增大第一纤芯的有效模场面积将导致开关的阈值增大。
With the increase of the effective mode field area of the first core, the switch threshold power increases.
通过在靠近纤芯处加上一层掺氟玻璃，能有效降低带隙内光子的限制损耗。
Confinement loss can be effectively lowered by adding a layer of F-doped glass near the core of this fiber.
推导出纤芯、包层、薄膜层、环境层的场分布表达式，利用数值计算求出了包层膜的有效折射率。
Resolve dispersion equation and obtain the effective refractive index of cladding using method of numerical calculation.
研究表明良好的预制棒加工质量可有效改善光纤纤芯与包层的界面状态，并且相对于纤芯玻璃来说，粘度较高的包层玻璃其加工质量对界面缺陷的影响更为显著。
Compared with core glass, the effect of optical processing quality of cladding glass on interface defects was more evident when its viscosity at drawing temperature was higher tha.
研究表明良好的预制棒加工质量可有效改善光纤纤芯与包层的界面状态，并且相对于纤芯玻璃来说，粘度较高的包层玻璃其加工质量对界面缺陷的影响更为显著。
Compared with core glass, the effect of optical processing quality of cladding glass on interface defects was more evident when its viscosity at drawing temperature was higher tha.
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