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提出了在会聚球面波照明下，用菲涅耳衍射实现分数傅里叶变换的光学装置。定量得出了为实现分数傅里叶变换系统结构参数应满足的条件。分析表明，利用该系统可实现任意阶分数傅里叶变换。
An optical device for fractional Fourier transform with Fresnel diffraction is proposed under convergent spherical wave illumination. The conditions that should be satisfied to achieve the structural parameters of FFT are obtained quantitatively. Analysis shows that the system can be used to achieve any fractional Fourier transform.