Waveguide assembly, integrated chip and LiDAR

An integrated chip, comprising a substrate and a waveguide assembly arranged on the substrate, wherein the waveguide assembly is configured for receiving an echo laser signal in a LiDAR, and the waveguide assembly comprises:

• a plurality of single-mode waveguides, wherein each single-mode waveguide extends along a first direction, the plurality of single-mode waveguides are arranged with intervals along a second direction, the second direction intersects with the first direction, and an effective refractive index of at least one single-mode waveguide is not equal to an effective refractive index of another adjacent single-mode waveguide,
• wherein in two adjacent single-mode waveguides, at least one single-mode waveguide comprises a sub-wavelength grating waveguide, and duty ratios of the two adjacent single-mode waveguides are not equal to each other.