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A kind of double-clad active optical fiber and its manufacturing method
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A double-clad, optical fiber technology, applied to clad optical fibers, multi-layer core/clad optical fibers, manufacturing tools, etc. question
Active Publication Date: 2021-02-26
WUHAN BRIGHTCORE OPTICAL FIBER CO LTD
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[0006] (2) Under the condition of meeting the same coupling power requirements, the cladding cross-sectional area can be appropriately reduced by increasing the numerical aperture of the cladding, thereby improving the pump absorption of the ytterbium-doped fiber, but limited by the nature of the material, the existing low It is difficult to change the refractive index coating greatly; although the cladding with air holes can greatly increase the numerical aperture of the cladding, the existence of air holes makes this type of optical fiber difficult to cut and splice, and it is difficult to match with existing optical devices. Disaster
[0007] (3) In order to reduce the helical light and improve the cladding pump absorption, the conventional double-clad active fiber adopts a special-shaped cladding design. This design makes it difficult to fuse the active fiber and the passive fiber, and it is easy to introduce additional The eccentricity will increase the splice loss and reduce the beam quality
In addition, it is also difficult to control the geometric size of shaped optical fibers in the drawing process
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Embodiment 1
[0043] Such as figure 1 As shown, the present embodiment provides a double-clad active optical fiber, which includes: a core 101, an inner cladding 108, an outer cladding 109, and a protective coating 110 from the inside to the outside; wherein, the inner cladding 108 is provided with M Filling areas 111, M is a positive integer.
[0044] Further, the cross-section of the double-clad active optical fiber may be polygonal (for example: square, or regular hexagon, or regular octagon, etc.).
[0045] Preferably, the cross-section of the double-clad active optical fiber is circular, so that it is difficult to weld the special-shaped double-clad active optical fiber and the passive optical fiber, and mechanical processing is easy to introduce additional eccentricity, and the fusion loss increases , the quality of the beam is reduced, and the geometric size control in the drawing process is more difficult.
[0046] Further, the M filling regions 111 are randomly distributed in the...
Embodiment 2
[0061] Based on the same inventive concept, this embodiment provides a manufacturing method for improving the cladding pump absorption of a double-clad active optical fiber, such as figure 2 shown, including:
[0062] Step S201 : preparing an active core rod 102 , the active core rod 102 includes a fiber core 101 and an inner cladding 108 .
[0063] In the specific implementation process, such as image 3 As shown, the active core rod 102 can be prepared by MCVD (Modified Chemical Vapor Deposition, modified chemical vapor deposition method) process. Specifically, on the quartz substrate, etching, inner cladding deposition, core layer deposition, rare earthdoping, etc. are sequentially performed, and then shrinking, polishing and other processes are performed to obtain the active mandrel 102 .
[0064] In a specific implementation process, after step S201, the active mandrel 102 should be cleaned. Specifically, the active mandrel 102 can be soaked in HF solution for 200 mi...
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Abstract
The invention discloses a double-cladding active optical fiber and a manufacturing method thereof. The double-cladding active optical fiber comprises a fiber core, an internal cladding, an external cladding and a protective coating layer which are arranged from inside to outside in turn. M filling areas are arranged in the internal cladding, wherein M is a positive integer, and the filling areas are composed of fillers of which the refractive index is less than that of the internal cladding. The technical problem of enhancing cladding pump absorption of the double-cladding active optical fiber in the prior art under the premise of guaranteeing the constant fire core doping concentration can be solved. Besides, preparation of the circular active optical fiber is allowed by the design so that matching and compatibility with the passive optical fiber can be greatly enhanced and thus the efficiency and the reliability of the optical fiber laser can be enhanced.
Description
technical field [0001] The invention relates to the field of optical fiber technology, in particular to a double-clad active optical fiber and a manufacturing method thereof. Background technique [0002] The technological breakthrough of high-power fiber lasers began with the double-clad pumping concept proposed by Snitzer et al. in 1988. Different from the design of ordinary communication fibers, in addition to the inner cladding around the core, the double-clad fiber is added with a low refractive indexcoating. The outer cladding formed by the layer makes the core have a higher refractive index relative to the inner cladding, and the inner cladding has a higher refractive index than the outer cladding, forming a double waveguide structure of the core and cladding. The rare earthion-doped core can be used as a lasergain medium, while cladding waveguides can be used to deliver the pump light source. Since the spot size of the multimode semiconductorlaser emitted by the...
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