Spectral processing is of great importance in optical research and applications. However, there are currently no multifunctional spectral processing devices with advanced processing capabilities. In this work, we implement on-demand spectral processing using a compact optical diffraction neural network (D2 NN), which includes only an SLM and a plane mirror. Spectral processing functions can be easily switched by changing the phase diagram on the SLM, which is obtained by computer pre-training of the D2 NN for a specific task. Tunable single and dual-band spectral filtering and wavelength demultiplexing are achieved.
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