Fiber integrated Gaussian-ring-shaped mode field adaptor

Abstract

The invention provides a fiber integrated Gaussian-ring-shaped mode field adaptor. The fiber integrated Gaussian-ring-shaped mode field adaptor is characterized by comprising a single mode fiber 1, adouble-clad fiber 2 and a ring-shaped mode field fiber 3 which are connected, wherein the double-clad fiber 2 with the length at a centimeter scale is arranged between the single mode fiber 1 and thering-shaped mode field fiber 3, and both ends of the double-clad fiber 2 are welded; thermal diffusion is applied to the welded point 12 of the double-clad fiber 2 and the ring-shaped mode field fiberto form a refractive index gradient area inside a thermal diffusion area 13 so that the fundamental mode of the double-clad fiber 2 can converted in a thermally insulated mode into the fundamental mode of the ring-shaped mode field fiber 3. The fiber integrated Gaussian-ring-shaped mode field adaptor can be applied to high-coupling-efficient mold field adaption between Gaussian mode field fibersand ring-shaped mode field fibers and accordingly can be widely applied to various applications based on the ring-shaped mode field fibers and the fields of ring-shaped mode field-based fiber integrated devices, laser devices, sensors and the like.

Description

(1) Technical field [0001] The invention relates to a fiber-integrated Gaussian-ring mode field adapter, which can be used for high coupling efficiency mode field adaptation between a Gaussian mode field fiber and a ring mode field fiber, and can be widely used in multiple applications based on ring mode field fibers. The application relates to the field of optical fiber integrated devices, lasers and sensors based on ring mode field optical fibers, and belongs to the technical field of fiber integrated optical fiber devices. (2) Background technology [0002] Mode field matching plays an important role in the design of fiber lasers and fiber micro-optic systems. Generally, the mode fields of fibers with different core diameters and numerical apertures are different, and the connection between two fibers with different mode fields usually has a large loss. To reduce connection loss, the mode fields must be similar. [0003] In recent years, various new types of optical fib...

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Problems solved by technology

[0006] In the above-mentioned disclosed methods, although the common three-stage structure is adopted, and tapered or thermal diffusion technology is used, the above-mentioned methods can only solve the mode field adaptation between the single-mode fiber and the large-mode-field fiber, and Cannot solve the mode field adaptation problem between single mode fiber and ring mode field fiber

In addition, when the thermal diffusion treatment is performed on the adapter fiber, it is not carefully designed to make the fundamental mode field of the adapter fiber and the connecting fiber adapt, so the coupling loss of the above-mentioned mode field adapter is also relatively high

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