fourier lenses meaning in English

傅利叶透镜

Awg possesses an essential function of coherence system - " composing frequency and generating image " . therefore as far as spatial frequency field is concerned , awg is an optical integration of coherent system : two slab waveguides similar to two fourier lenses of one dimension and twice fourier transform of optical signals are realized . here the arrayed waveguide region is frequency spectrum region
Awg具有相干系统的“分频成谱、合频成像”这一本质功能，因此若从空间频域的角度来看， awg就是一个相干系统的光学集成：两个平板波导类似两个一维傅里叶透镜，实现光信号的两次傅里叶变换；而阵列波导区即为频谱区。