Coupling device for double core optical fiber and manufacturing method thereof

Abstract

The invention relates to a coupling device for a double core optical fiber and a manufacturing method thereof. The coupling device comprises a double core optical fiber, an electro-optic crystal, and a first single-core optical fiber and a second single-core optical fiber which are connected with the electro-optic crystal, wherein one end of the first single-core optical fiber and one end of the second single-core optical fiber are combined; the electro-optic crystal is loaded with magnitude-adjustable lateral load voltage; the longitudinal length delta of the electro-optic crystal is equal to zero or the longitudinal length of the electro-optic crystal is the transmission length of light in a crystal; k is a cross-coupling coefficient between waveguides in the electro-optic crystal; and delta is a propagation constant. The coupling from the double core optical fiber to the single-core optical fiber is realized, and light in two fiber cores is output to the two single-core optical fibers in the double core optical fiber by adjusting the voltage V, so that the splitting from the double core optical fiber to the single-core optical fiber is realized further. Meanwhile, the output ratio from an optional fiber core of the double core optical fiber at an input end to an optional single-core optical fiber at an output end can be changed.

Description

technical field [0001] The invention relates to the technical field of optical fiber couplers, in particular to a dual-core optical fiber coupling device and a manufacturing method thereof. Background technique [0002] Optical fiber coupler is a passive device widely used in optical fiber communication network, optical fiber sensing and optical fiber measurement. It usually uses optical fiber fusion taper and device packaging technology to achieve stable distribution of power and wavelength in optical fiber. [0003] The manufacturing processes of all-fiber couplers mainly include fusion cone method, grinding and polishing method and corrosion method. The melting taper method is to remove the coating layer of two optical fibers, and then heat them together with a high-temperature flame to melt them. When the optical fibers are melted, the optical fibers are stretched at both ends of the optical fibers, so that the optical fiber melting zone becomes a tapered transition sect...

AI Technical Summary

Problems solved by technology

[0004] In recent years, multi-core optical fiber has been widely studied and gradually put into practical use, but the problems of multi-core optical fiber splicing and the splicing of multi-core optical fiber to single-core optical fiber have not been effectively solved.

Even if the light transmitted in the multi-core fiber can be finally output through the single-core fiber, the splitting of the multi-core fiber cannot be realized, and the light transmitted in each core of the multi-core fiber cannot be output separately through the tail end.

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