Fig. 1. Structure of photonic reservoir computing. (a) Overall structure; (b) Input layer

Fig. 2. Diagram of photonic filter system experimental setup

Fig. 3. Schematic diagram of device model in photonic reservoir computing. (a) Waveguide; (b) Directional coupler; (c) Optical modulation

Fig. 4. 8 channel signal spectra of reservoir output. (a) Rout 1; (b) Rout 2; (c) Rout 3; (d) Rout 4; (e) Rout 5; (f) Rout 6; (g) Rout 7; (h) Rout 8

Fig. 5. Simulation training effect of IIR optical filter. (a) IIR filter spectrum fitting rendering; (b) Fitness curve

Fig. 6. Simulation training effect of FIR optical filter. (a) FIR filter spectrum fitting rendering; (b) Fitness curve

Fig. 7. IIR filter spectrum of waveguide at different lengths in reservoir. (a) Waveguide length of 400 μm; (b) The waveguide length of 500 μm; (c) The waveguide length of 600 μm

Fig. 8. FSR changing with waveguide length

Fig. 9. Output power of filter changing with the wavelength in different directional coupler radio

Fig. 10. Output power of filter changing with the wavelength in different phase shifts