SPOT SIZE CONVERTER AND SILICON-OPTICAL INTEGRATED CHIP

摘要

A spot size converter and a silicon-optical integrated chip. The spot size converter is provided with a first end face (a) optically coupled to an external optical fiber (70) and a second end face (b) optically coupled to an external optical device, and comprises a first optical waveguide (10) and a second optical waveguide (20), the first optical waveguide (10) comprising a first wedge-shaped structure (11) and a second wedge-shaped structure (12), the first wedge-shaped structure (11) and the second wedge-shaped structure (12) facing opposite directions, and the second optical waveguide (20) comprising a third wedge-shaped structure (21), a tip of the third wedge-shaped structure (21) facing the first wedge-shaped structure (11) and at least partially overlapping with the second wedge-shaped structure (12). By designing a special waveguide coupling structure, the mode matching degree between the spot size converter and the external optical fiber (70) is improved, the polarization-dependent loss between the two optical waveguides in the spot size converter is reduced, and the thermal stability of optical waveguides in the silicon-optical integrated chip is improved, thereby reducing the light transmission loss in the silicon-optical integrated chip.