Fig. 1. Structural diagram of PPLN ridge waveguide

Fig. 2. Relationship between QPM period of PPLN and waveguide size under room temperature when fundamental frequency wavelength is 1560 nm. (a) QPM period versus ridge height; (b) QPM period versus ridge width

Fig. 3. QPM period of PPLN versus temperature when fundamental frequency wavelength is 1560 nm and both ridge height and width are 10 μm

Fig. 4. Preparation process of PPLN ridge waveguide

Fig. 5. Silicon-based PPLN thin film ridge waveguide device

Fig. 6. Schematic of experimental setup

Fig. 7. Test results of silicon-based PPLN thin-film ridge waveguide device. (a) Output spectrum of fiber-in fiber-out PPLN waveguide package module; (b) relationship between output and input power of PPLN waveguide package module