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Large-mode-field fiber pumped coupler and manufacturing method thereof

A large mode field and coupler technology, applied in the field of lasers, can solve the problems of mode field size and shape damage, low signal coupling efficiency, etc., to achieve high power coupling and improve coupling efficiency

Active Publication Date: 2013-01-23
TSINGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This is because the fused taper method will cause great damage to the size and shape of the mode field during the taper process for the main fiber with a large mode field, resulting in low coupling efficiency of the signal

Method used

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  • Large-mode-field fiber pumped coupler and manufacturing method thereof
  • Large-mode-field fiber pumped coupler and manufacturing method thereof
  • Large-mode-field fiber pumped coupler and manufacturing method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0047] This embodiment describes a large mode field optical fiber pumping coupler, including a main optical fiber and a pumping optical fiber bundle containing several pumping optical fibers, one end of the pumping optical fiber bundle is surrounded by the several pumping optical fibers A hollow optical fiber bundle, one end of the main optical fiber is provided with a transition area exposing the inner cladding and inserted into the hollow part of the pumping optical fiber bundle, and the part of the pumping optical fiber corresponding to the transition area of ​​the main optical fiber is the exposed cladding The tapered end of the pump fiber, the cladding at the tapered end of the pump fiber is in close contact with the inner cladding of the transition zone of the main fiber and is fused together.

[0048]The transition zone of the main optical fiber is a cylinder whose radial dimension is smaller than the radial dimension of the inner cladding body of the main optical fiber,...

Embodiment 2

[0054] Such as figure 1 and Figure 2a As shown in -d, this embodiment records the manufacturing method of the above-mentioned large mode field fiber pump coupler, including the following steps:

[0055] S1: Removing the coating layers 111 of several pumping fibers 110 in the pumping fiber bundle to be fused to expose the cladding layer 112; removing the coating layer 121 of the main optical fiber 120 from one end to expose the inner cladding layer 122;

[0056] S2: The inner cladding 122 of the main optical fiber whose coating layer has been removed is reduced in diameter by chemical etching or mechanical polishing to form the desired shape of the transition zone 123; The method of tapering is tapered according to a certain taper to a predetermined size to form a tapered end 113; during the tapering process, the central optical fiber of the pump fiber bundle is replaced by a metal wire 130; after the tapering is completed, the metal wire 130 is pulled out and pumped The opt...

Embodiment 3

[0063] Such as Figure 3a and 3b Shown is the large mode field fiber pump coupler of this embodiment. Its production method is:

[0064] Remove an axial length of 30 cm from the coating 221 of a circular double-clad main optical fiber 220 with core / inner cladding diameters of 50 / 400um respectively, exposing the inner cladding 222;

[0065] The core / cladding diameters of the six pumping fibers 210 are 200 / 220um, and the coating layer 211 of each pumping fiber 210 is removed by 3cm axial length to expose the cladding 212;

[0066] Use HF to chemically corrode the decoating layer of the double-clad main optical fiber 220, so that the diameter of the inner cladding is reduced to 133um, and the inner cladding 222 of the transition zone 223 and the inner cladding 222 of the main optical fiber 220 are stepped;

[0067] The 6 pumping optical fibers 210 are melted and tapered by using the hydrogen-oxygen flame heating fusion tapering method. During the tapering process, the center o...

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Abstract

The invention discloses a large-mode-field fiber pumped coupler and a manufacturing method thereof. The coupler comprises a main fiber and a pumped fiber bundle containing a plurality of pumped fibers, wherein the hollow fiber bundle is defined by a plurality of pumped fibers; one end of the main fiber is provided with a transition zone which exposes an inner cladding and is inserted into a hollow part of the pumped fiber bundle; the corresponding part of the pumped fibers and the transition zone of the main fiber is a tapering end which exposes a cladding; and the cladding of the tapering end of the pumped fibers is in close contact with and integrally fused with the inner cladding of the transition zone of the main fiber. The manufacturing method comprises the following steps of: preprocessing a plurality of pumped fibers to form the hollow fiber bundle, and cutting at an appropriate position; reducing or not reducing the diameter of the inner cladding of the main fiber; inserting the preprocessed main fiber into the hollow pumped fiber bundle to ensure that the main fiber is in close fit with the fiber bundle; and integrally fusing the main fiber with the fiber bundle, and recoating the main fiber. On the premise of not damaging a fiber core structure of the large-mode-field main fiber, signal coupling efficiency is improved.

Description

technical field [0001] The invention relates to the technical field of lasers, in particular to a large-mode-field optical fiber pump coupler and a manufacturing method thereof. Background technique [0002] High-power and high-energy fiber lasers and fiber amplifiers have broad application prospects in industrial processing, military and medical fields. In recent years, the output power and energy of fiber lasers have been greatly improved by using ordinary single-mode fibers. However, the further improvement of power and energy will be limited by the special lens effect, fiber nonlinear effects (such as stimulated Brillouin scattering and stimulated Raman scattering) and fiber damage. The application of high-performance ultra-large mode field fiber to high-power and high-energy fiber lasers and amplifiers provides the possibility for further improvement of power and energy. In the prior art, it has been proposed to apply large-mode-field fibers to high-power laser system...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G02B6/28G02B6/036G02B6/255G02B6/245
Inventor 巩马理肖起榕闫平张海涛柳强黄磊
Owner TSINGHUA UNIV
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