提出了臂内含有光纤光栅的方向耦合器的一般模型，推导了任意端口输入时任何一端口的输出表达式。
A general model for fiber directional coupler with fiber Bragg gratings in its arms is presented. The output expression of any arm is obtained when input is from an arm.
' h '桥梁设计建立在一个现有的印刷电路板的，基本上只是一个完整的控制器电路和两个输出阶段联系在一起，在输入光电耦合器。
The 'h' Bridge design built on one of the existing PCB's, basically just one complete controller circuit and two output stages linked together at the input of the optocouplers.
在此基础上，利用导模与辐射模的耦合模理论较系统地描述了棱镜耦合器的输入、输出特性。
On this basis input and output coupling properties have been described systematically by coupled mode theory of guided mode and radiation mode.
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