Fig. 1. Theoretical model of integrated device based on photonic crystal electro-optic modulation and coarse wavelength division multiplexing

Fig. 2. Theoretical model of L3 resonator-waveguide filter. (a) Model before simplifying; (b) simplified model

Fig. 3. Structure of integrated device of photonic crystal electro-optic modulation and coarse wavelength division multiplexing

Fig. 4. Structure diagram and parameter change curves of electro-optic modulator module. (a)Schematic diagram of electro-optic modulator structure; (b) variation of the resonant wavelength and reflectivity of the L3 resonator with the resonator width W₁

Fig. 5. Schematic diagram of electro-optic modulator doping structure

Fig. 6. Carrier density distributions diagram when the voltage across both ends is 1.505 V. (a) P-type carrier density; (b) N-type carrier density

Fig. 7. Modulation reflectance spectra under V=1.505 V “on” and V=0 “off” states

Fig. 8. Structure diagram of coarse wavelength division multiplexing module

Fig. 9. Transmission spectrum of coarse wavelength division multiplexing module

Fig. 10. Design of cascaded electro-optic modulator and filter with a wavelength of 1530 nm. (a) Schematic diagram of structural parameters of cascaded devices; (b) schematic diagram of tapered waveguide structure parameters; (c) input transmission spectrum before and after optimization of the waveguide

Fig. 11. Overall integrated device structure diagram

Fig. 12. Steady-state field distribution diagrams of integrated devices. (a) Modulation state of 1530 nm is “on”; (b) modulation state of 1530 nm is “off”; (c) modulation state of 1550 nm is “on”; (d) modulation state of 1550 nm is “off”

Fig. 13. Transmission spectra of integrated device. (a) Modulation state is “on”; (b) modulation state is “off”

Table 1. Performance parameters of integrated devices at different wavelengths