把傅里叶频谱分析方法引入棱镜-薄膜波导耦合系统的输入输出耦合问题，快速而完整地求解了系统输入输出耦合方程组。
The Fourier spectral analysis method is applied to the input-output coupling problem of a prism-thin film waveguide system. The input-output coupling equations are solved fast and exactly.
在满足实时成像和一定分辨率的条件下，分析了系统对运算速度的要求，提出了一种改进的快速傅里叶算法及其实现方法。
Under the conditions of meeting the real time imaging and given resolution, the algorithmic speed required by the system is analyzed. And an improved FFT algorithm and its implementation are given.
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