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考虑到包层厚度和包层外介质的影响 ,在单模光纤的高斯近似理论基础上 ,导出了单模阶跃光纤模场半径方程 ,并就光纤在传感等领域应用中常见的熔拉和腐蚀处理两种情况 ,进行了相应的数值计算 ,给出了近似解析解。引入特性转换点 ,对模场特性作了分析。
Taking into account the influence of cladding thickness and cladding outside the medium, based on the Gaussian approximation theory of single-mode fiber, the mode field radius equation of single-mode step fiber is deduced. In addition, And corrosion treatment of the two cases, the corresponding numerical calculations, given the approximate analytical solution. Introduced the characteristic changeover point, has analyzed the mode field characteristic.