Fig. 1. Schematic diagram of the device

Fig. 2. The effects of different waveguide widths on the refractive index of the waveguide on the effective refractive index and group refractive index on the refractive index change

Fig. 3. 2×2 MMI schematic

Fig. 4. The effects of the offset of the curved waveguide on the loss of the device

Fig. 5. The simulated spectral responses of four-channel CWDM（De）MUX

Fig. 6. The fabrication process of the device

Fig. 7. The micrographs of the fabricated CWDM（De）MUX

Fig. 8. Experimental setup

Fig. 9. Measured transmission of the 4-channel CWDM（De）MUX

Fig. 10. Spectrum response diagram of Ch. 3 at different temperatures