The methods of coupling between LD and optical fiber can be divided into direct and indirect coupling according to whether optical devices exist between them.

LD与光纤的耦合，按照LD与光纤之间是否存在光学元件，耦合方式可分为两种，即直接耦合与间接耦合。

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The direct and indirect coupling loss factors of a coupled system with three substructures are predicted by using this method, and the measured data agree well with the predicted results.

以三子结构耦合系统为例进行了实验测量，直接、间接耦合损耗因子和结构振动响应的实验测量值与理论预测结果吻合较好。

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An indirect inverse substructure scheme for calculating the dynamic stiffness of discrete coupling unit-of-packaging was introduced. A formula was derived based on matrix theory.

提供一种间接计算离散化包装耦合体动刚度的逆子结构分析计算方法，依据矩阵理论推导了计算公式。

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