从亥姆霍兹方程出发，导出了自聚焦光纤中传导模在圆柱坐标系中的场分布形式，并给出了几个低阶模的分布图。
The propagation modes in selfco fiber, which features the laguerre Gauss distributions, are derived by solving the helmholtz wave equation incylindrical coordinates.
进一步对三种异质结进行研究，得出传导模的出现不只是晶格结构畸变一种情况可以产生，其他两种异质结也能产生传导模。
It is further shown that guide modes appear not only in the case of lattice structure aberrance but also in the other two cases.
其测试诊断步骤依序为：传导发射测试、辐射辐射测试、共模电流测量和机箱泄漏检查。
The testing processes are testing of conductive transmit and radiant transmit, testing of common-mode current and detecting divulgation in turn.
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