Ran Zhao, Chonglei Sun, Xiao Xu, Jia Zhao. Ultra-Compact Vertical Optical Coupler Based on Subwavelength Grating[J]. Acta Optica Sinica, 2020, 40(14): 1405002
- Acta Optica Sinica
- Vol. 40, Issue 14, 1405002 (2020)
Fig. 1. Schematics of designed vertical optical coupler. (a) 3D diagram; (b) cross-sectional view; (c) top view; (d) 3D diagram of SWG and tapered waveguide
Fig. 2. Effective refractive index versus equivalent refractive index of SWG
Fig. 3. Coupling ratio versus number of periods of subwavelength grating
Fig. 4. Coupling ratio versus wavelength for vertical coupler
Fig. 5. Normalized electric field intensity of light field. (a) Top view; (b) side view; (c) cross-sectional light field distribution at A; (d) cross-sectional light field distribution at B; (e) cross-sectional light field distribution at C
Fig. 6. Fabrication process
Fig. 7. Tolerance analysis of process errors. (a)Coupling ratio versus duty cycle; (b) coupling ratio versus tip width of tapered waveguide; (c) coupling ratio versus misalignment, and position of coupler relative to LN waveguide indicated in inset
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Table 1. Material parameters and structural parameters of designed vertical optical coupler waveguide
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