Edge coupler

Abstract

The invention discloses an edge coupler which can be directly coupled with a laser and can also be migrated and applied to various optical path coupling scenes needing spot size conversion. According to the edge coupler, two layers of waveguide array structures are designed in the vertical direction, a light gathering waveguide structure is designed at the light output end of a waveguide array, light of the two layers of waveguide array structures is gathered through a light gathering waveguide, and coupled light beams are output. The light gathering waveguide can be directly and physically connected with the two layers of waveguide arrays through a photoetching process, and can be coupled by utilizing the Goos-Hanchen line shift principle. When the light gathering waveguide is coupled with an optical path by adopting the Goos-Hanchen line shift principle, the light gathering waveguide is designed between the two layers of waveguide array structures, and the light input end of the light gathering waveguide and the light output end of the waveguide array are partially overlapped and have a gap. By adopting the edge coupler designed by the invention, direct coupling of an optical path can be realized, and a spot-size conversion lens is omitted, so that the packaging process is simpler, and the packaging size is smaller.

Description

technical field [0001] The invention relates to an optical coupling semiconductor device, in particular to an edge coupler for coupling a laser or an optical fiber beam. Background technique [0002] With the development of information technology, highly integrated miniaturization has gradually become the mainstream direction of the development of various semiconductor devices. In the field of optical communication, due to the special requirements of beam coupling, the packaging process of optical devices is complicated, there are many components, and the package size is large. Reducing optical devices is of great significance to the size optimization of optical modules. [0003] At present, the coupling between optoelectronic chips, lasers and optical fibers in the industry mostly adopts a multi-lens scheme. For example, at the light output end of a laser, a lens is used to collimate and focus the output light of the laser (emitting a Gaussian beam) to the optical waveguide...

AI Technical Summary

Problems solved by technology

However, at the light output port of the laser, the offset angle of the fast axis direction is larger than that of the slow axis direction. The existing planar multi-waveguide array is set on the slow axis plane, and it is impossible to match the mode spot size of the edge coupler with the beam fast axis direction. Offset angle matching and light leakage in the fast axis direction seriously restrict the improvement of coupling efficiency

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