CN217506182U

CN217506182U - Mode field adapter

Info

Publication number: CN217506182U
Application number: CN202221168405.2U
Authority: CN
Inventors: 王强强; 卢国杰; 牛增强
Original assignee: United Winners Laser Co Ltd
Current assignee: United Winners Laser Co Ltd
Priority date: 2022-05-16
Filing date: 2022-05-16
Publication date: 2022-09-27
Anticipated expiration: 2032-05-16

Abstract

The utility model discloses a mode field adapter belongs to laser technical field, for solving the complicated problem design of current device technology operation. The utility model discloses a: comprises an input optical fiber end and an output optical fiber end; the input optical fiber end is divided into an input optical fiber, a transition area and a cone after tapering through a sleeve; the output optical fiber end comprises an output optical fiber and a cladding corrosion area. The utility model discloses convenient operation, easily control.

Description

Mode field adapter

Technical Field

The utility model relates to a laser instrument technical field especially relates to a mode field adapter.

Background

Mode Field Adapters (MFAs) are an important fiber device in the field of fiber lasers, mainly to solve the problem of mode field mismatch between fibers. Its main effects are two: one is to reduce the fusion loss between fibers with different core diameters, and the other is to maintain the fundamental mode transmission of laser light in large mode field fibers. The manufacture of the optical fiber mode field adapter mainly comprises two operations, namely increasing the mode field diameter of the optical fiber on one hand and reducing the mode field diameter of the large mode field optical fiber on the other hand. The former can be realized by means of heating core expansion and the like, and the latter is mainly realized by tapering the optical fiber. The heating core expanding technology is to heat the optical fiber to diffuse the doped matter in the fiber core into the cladding, so as to achieve the purpose of expanding the core. The market demands a simple, convenient and easy-to-control process for manufacturing the mode field adapter.

Disclosure of Invention

The utility model discloses mainly adopt a novel sleeve pipe tapering to handle input fiber, for realizing above-mentioned purpose, the utility model provides a mode field adapter: comprises an input optical fiber end and an output optical fiber end; the input optical fiber end is divided into an input optical fiber, a transition area and a cone after tapering through a sleeve; the output optical fiber end comprises an output optical fiber and a cladding corrosion area.

Optionally, the cladding of the input optical fiber is disposed in the inner cavity of the fluorine-doped glass tube, the inner cavity of the fluorine-doped glass tube is matched with the diameter of the cladding of the input optical fiber, and the input optical fiber coating layer is disposed between the cladding of the input optical fiber and the fluorine-doped glass tube.

Optionally, the product of the numerical aperture of the input optical fiber and the first mode field diameter is less than or equal to the product of the numerical aperture of the output optical fiber and the second mode field diameter.

Optionally, the diameter of the taper is less than or equal to the core diameter of the output fiber.

Optionally, the value of the inner cavity of the fluorine-doped glass tube of the input optical fiber is simulated according to the diameter of the core of the output optical fiber.

Optionally, the taper is fused to the output fiber.

Optionally, the output fiber is etched by hydrofluoric acid.

Optionally, after the cone is welded with the output optical fiber, the adhesive is dispensed and fixed.

Optionally, the inner cavity of the fluorine-doped glass tube is 250 um.

Optionally, the input fiber is embedded in the inner cavity of the fluorine-doped glass tube, the core diameter of the input fiber is 20um, and the cladding diameter of the input fiber is 250 um.

The utility model has the advantages that: can realize expanding the core, the accessible carries out hydrofluoric acid corrosion treatment increase core package to output fiber and compares, can be more convenient for the butt fusion.

Drawings

Fig. 1 is a schematic view of an embodiment of the present invention.

Detailed Description

Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein the specific meanings of the above terms in the present invention are understood in particular by those skilled in the art.

The present invention will be further explained with reference to the accompanying drawings:

referring to fig. 1, in an embodiment of the present invention, the optical fiber connector includes an input optical fiber end and an output optical fiber end, and the input optical fiber end is divided into an input optical fiber, a transition region 1 and a cone 2 after tapering through a sleeve; the output fiber end is an output fiber and cladding corrosion area 3. The fluorine-doped glass tube 6 is adopted for pretreatment or is directly penetrated on an input optical fiber, then tapering is carried out, the length of the tapering meets the condition of adiabatic tapering, and the output optical fiber is subjected to hydrofluoric acid corrosion treatment to increase the core cladding ratio. The fluorine-doped glass tube 6 restrains light from transmitting in the fiber core of the output optical fiber and the cladding 4 of the output optical fiber; at the position of the cladding 4 of the output fiber, the diameter of the taper 2 is consistent with or smaller than that of the core of the output fiber, and the brightness conservation is satisfied, namely the product of the numerical aperture of the input fiber and the diameter of the mode field is smaller than or equal to the product of the numerical aperture of the output fiber and the diameter of the mode field. The optimal proportion is obtained by simulating the inner cavity value of the input end fluorine-doped glass tube 6 according to the fiber core diameter of the output optical fiber under the condition of ensuring the heat insulation taper and the brightness conservation, and the mode field adapter has low loss, high efficiency and high performance and is suitable for large-mode-field optical fibers.

In one embodiment, the cladding 5 of the input fiber is disposed within the inner cavity of a fluorine-doped glass tube 6, the inner cavity of the fluorine-doped glass tube 6 matching the diameter of the cladding 5 of the input fiber.

In one embodiment, the product of the numerical aperture and the mode field diameter of the input fiber is less than or equal to the product of the numerical aperture and the mode field diameter of the output fiber.

In one embodiment, the diameter of the taper 2 is less than or equal to the core diameter of the output fiber.

In one embodiment, the value of the inner cavity of the input end fluorine-doped glass tube 6 is simulated according to the core diameter of the output optical fiber.

In one embodiment, the taper 2 is fused to the output fiber.

In one embodiment, the output fiber is etched by hydrofluoric acid.

In one embodiment, the taper 2 is fixed by dispensing after fusion splicing with the output fiber.

In one embodiment, the inner cavity of the fluorine-doped glass tube 6 is 250 um.

In one embodiment, the input fiber is embedded in the inner cavity of the fluorine-doped glass tube 6, the core diameter of the input fiber is 20um, and the cladding 5 of the input fiber has a diameter of 250 um.

The technical principle of the present invention is described above with reference to the specific embodiments. The description is made for the purpose of illustrating the principles of the invention and should not be construed in any way as limiting the scope of the invention. Based on the explanations herein, those skilled in the art will be able to conceive of other embodiments of the present invention without any inventive effort, which would fall within the scope of the present invention.

Claims

1. A mode field adapter comprising an input fiber end and an output fiber end; the input optical fiber end is divided into an input optical fiber, a transition area and a cone after tapering through a sleeve; the output optical fiber end comprises an output optical fiber and a cladding corrosion area.

2. The mode field adapter of claim 1, wherein the input fiber cladding is disposed in a lumen of a fluorine-doped glass tube, the lumen of the fluorine-doped glass tube matching a diameter of the input fiber cladding, the input fiber coating being disposed between the input fiber cladding and the fluorine-doped glass tube.

3. The mode field adapter of claim 1, wherein the product of the numerical aperture of the input optical fiber and the first mode field diameter is less than or equal to the product of the numerical aperture of the output optical fiber and the second mode field diameter.

4. The mode field adapter of claim 1, wherein the diameter of the taper is less than or equal to the core diameter of the output fiber.

5. The mode field adapter of claim 4, wherein a value of an inner cavity of a fluorine-doped glass tube of the input optical fiber is modeled based on a core diameter of the output optical fiber.

6. The mode field adapter of claim 1, wherein the taper is fusion spliced to the output fiber.

7. The mode field adapter of claim 1, wherein the output fiber is etched by hydrofluoric acid.

8. The mode field adapter of claim 1, wherein the taper is spot-bonded to the output fiber after fusion splicing.

9. The mode field adapter of claim 2, wherein the inner cavity of the fluorine-doped glass tube is 250 um.

10. The mode field adapter of claim 1, wherein the input fiber is embedded in the inner cavity of the fluorine-doped glass tube, the input fiber having a core diameter of 20um and a cladding diameter of 250 um.