Fig. 1. Structure diagram of integrated waveguide array. (a) Parallel waveguide; (b) spatial cross waveguide

Fig. 2. Parallel waveguide structure and electric field distributions in different modes. (a) Cross-section diagram of parallel waveguide structure; (b) TE mode, even symmetry; (c) TE mode, odd symmetry; (d) TM mode, even symmetry; (e) TM mode, odd symmetry

Fig. 3. Relationship between coupling coefficient and different parameters. (a) g⊥; (b) refractive index of intermediate layer medium

Fig. 4. Relationship between coupling efficiency and different parameters. (a) g⊥; (b) refractive index of intermediate layer medium; (c) wavelength; (d) angle

Fig. 5. Relationship between coupling efficiency and ∆w

Fig. 6. Relationship between coupling efficiency and angle in TE mode

Fig. 7. Exchange structure between optical layers