Fig. 1. DL-based disordered-dispersion miniature spectrometer

Fig. 2. Rough surface of frosted glass

Fig. 3. Speckle intensity under different wavelength monochromatic light illumination. (a) 514 nm; (b) 516 nm; (c) their normalized intensity difference

Fig. 4. Normalized spectra of 8 LEDs

Fig. 5. MLP neural network framework

Fig. 6. Loss function (MSE) decline curve with increasing training epochs

Fig. 7. Spectral reconstruction results of the spectrometer. (a) Reconstruction of 6 narrowband spectra with different wavelength; (b) reconstruction of 2 broadband spectra at different times; (c) reconstruction of 2 close narrowband spectra; (d) comparison of spectral reconstruction using Tikhonov regularization and MLP neural network