Fiber Fourier optics.
Fiber Fourier optics.
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DOI：
10.1364/ol.26.001215
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发表时间：
2001-08
期刊：
影响因子：
3.6
通讯作者：
A. Siegman
中科院分区：
文献类型：
--
作者：
A. Siegman
相干光学图像的傅里叶变换可以通过使用单个透镜加上自由空间传播来进行物理评估，从而为傅里叶光学领域提供了基础。我指出，通过将离散阵列幅度通过单模光纤或光波导网络，可以类似地在物理上评估采样或像素化光学阵列的离散傅里叶变换。利用(N/2)log(2)[N]个3-d B光耦合器加上微小的相移，可以构成一个评估相干阵列的快速傅里叶变换的无源光网络。以光纤或集成光学形式实现这样的网络可以为可能的光纤傅里叶光学技术提供基础。
The Fourier transform of a coherent optical image can be evaluated physically by use of a single lens plus free-space propagation, thereby providing the basis for the field of Fourier optics. I point out that one can similarly evaluate the discrete Fourier transform of a sampled or pixelated optical array physically by passing the discrete array amplitudes through a network of single-mode fibers or optical waveguides. A passive optical network that evaluates the fast Fourier transform of a coherent array can be fabricated by use of (N/2)log(2)[N] optical 3-dB couplers plus small added phase shifts. Implementing such networks in fiber or integrated optical form could provide the basis for a possible technology of fiber Fourier optics.