Plant waveguide and optical fibre low-loss connecting method

Abstract

In the method the waveguide with bisect structure is connected to optical fibre at tail end of single-mode waveguide. The light mode spot is gradually changed to match with optical fibre intrinsic mode spot to decrease couple losses for butt-joint of optical waveguide with optical fibre when the light is transmitted from single-mode waveguide to branch waveguide and then transmitted along with the branch waveguide structure.

Description

technical field [0001] The invention relates to a method for connecting an optical waveguide and an optical fiber. Background technique [0002] Optical integrated devices have important applications in information processing such as optical communication. Among the many materials and waveguide structures that constitute optical integrated devices, optical waveguides represented by silica waveguide materials have a wide range of applications. In a device with a simple structure, the refractive index difference between the waveguide core layer and the cladding layer is very small, which belongs to the weak confinement waveguide, so the cross-sectional size of the waveguide is large, and the loss of the connection with the optical fiber is small. With the increasing complexity of optical integrated devices, due to the constraints of chip size and other factors, the difference between the refractive index of the core layer of the waveguide and the ref...

AI Technical Summary

Problems solved by technology

With the increasing complexity of optical integrated devices, due to the constraints of chip size and other factors, the difference between the refractive index of the core layer of the waveguide and the refractive index of the cladding layer is generally increased. In order to maintain the single-mode waveguide, it is necessary to reduce the cross-sectional size of the waveguide, which is Causes increased coupling loss of the waveguide and fiber butt joint

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