Double-cladding all-solid photonic crystal gain fiber and manufacturing method thereof

A photonic crystal fiber, all-solid-state technology, applied in cladding fiber, multi-layer core/cladding fiber, glass manufacturing equipment, etc., can solve the limitation of single-mode all-solid-state photonic crystal fiber High, did not achieve large mode field single-mode output and other issues

Inactive Publication Date: 2014-04-30
SHANGHAI INST OF OPTICS & FINE MECHANICS CHINESE ACAD OF SCI
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  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the current all-solid-state photonic crystal fiber still does not achieve single-mode output with a large mode field. One of the main reasons is that the refractive index of the doped fiber core is higher than that of the backing material, which makes the existence of the photonic crystal inner cladding difficult. Further increase the numerical aperture of the doped core, thereby limiting the realization of single-mode all-solid-state photonic crystal fibers and the expansion of their single-mode cores

Method used

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  • Double-cladding all-solid photonic crystal gain fiber and manufacturing method thereof
  • Double-cladding all-solid photonic crystal gain fiber and manufacturing method thereof

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preparation example Construction

[0025] The preparation method of the above-mentioned double-clad all-solid-state photonic crystal fiber is characterized in that it comprises the following steps:

[0026] ① Preparation of glass rods with uniform outer diameter:

[0027] The first glass rod 1, the second glass rod 2 and the third glass rod 3 are made by using a drawing tower, the first glass rod 1 is a uniform thin rod of undoped glass, and the third glass rod 3 is a doped glass uniform thin rod, the second glass rod 2 is composed of core glass and cladding glass, the refractive index of the core glass is lower than that of the cladding glass, and the cladding glass finally becomes the optical fiber inner cladding layer, the refractive index of the first glass rod 1 is smaller than the refractive index of the cladding glass of the second glass rod 2, the refractive index of the third glass rod 3 is smaller than the refractive index of the cladding glass of the second glass rod 2, Then according to the require...

Embodiment 1

[0034] Using fluoride glass as the matrix material, the double-clad all-solid-state photonic crystal fiber is fabricated by stacking method (see figure 2 (a)). The first glass rod 1 and the second glass rod 2 are respectively undoped fluoride glass, and the third glass rod 3 is Tm-doped fluoride glass with a doping concentration of 3000ppm. The refractive indices of the first glass rod 1 and the third glass rod 3 are (at ~1500nm) 1.49 and 1.505 respectively, and the glass transition temperatures are 450°C and 470°C respectively, and the cladding glass and core glass of the second glass rod 2 have The refractive index (~1500nm) is 1.51 and 1.49 respectively, the glass transition temperature is 455°C and 450°C, the outer diameter of the three kinds of glass rods is 1mm (the error is less than 1%), and the length is 15cm. Close-packed glass rods in a metal sleeve, where the number of layers of preformed rods is m=7, the number of layers replaced by the outermost layer is n=2, a...

Embodiment 2

[0037] Quartz glass is used as the host material, and the stacking method is used to make double-clad all-solid-state photonic crystal fibers (see figure 2 (b)). The first glass rod 1 is fluorine-doped quartz glass with a refractive index (at 1 μm) of 1.447, the cladding glass of the second glass rod 2 is undoped quartz glass, and the core glass is fluorine-doped quartz glass with a refractive index of 1.447. (at 1μm) are 1.45, 1.445 respectively. The third glass rod 3 is Yb-doped quartz glass with a concentration of 3000ppm and a refractive index of 1.449. The outer diameter of the three kinds of glass is 0.8mm (the error is less than 2%), and the length is 15cm. Nine layers (m=9) of the first glass rods 1 are densely packed in the metal sleeve, the outermost 3 layers (n=3) of the first glass rods 1 are replaced by the second glass rods 2, and the center 7 is replaced by the third glass rod 3 A first glass rod 1 was sintered at 1800° C. for 15 minutes. Draw the filament ...

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Abstract

The invention relates to a double-cladding all-solid photonic crystal gain fiber and a manufacturing method of the double-cladding all-solid photonic crystal gain fiber. The double-cladding all-solid photonic crystal gain fiber includes a fiber core, an inner cladding and an outer cladding and is characterized in that the refraction index of the fiber core is low than the refraction index of backing material of the inner cladding. While the fiber keeps the all-solid photonic crystal fiber characteristics, single-mode (M<2> <1.1) large-mode-field (the diameter of the mode field is larger than 50 microns) laser output of the fiber can be achieved.

Description

technical field [0001] The invention relates to a double-clad photonic crystal fiber, in particular to a double-clad all-solid-state photonic crystal gain fiber with a core refractive index lower than that of a back material and a preparation method thereof. Background technique [0002] Single mode (M 2 <1.1) Rare-earth-doped double-clad step optical fibers have been widely studied due to their important applications in optical communication, optical sensing, advanced processing, biomedicine, national defense and military fields, and one of the focuses of their research It is the improvement of the output power of the optical fiber. Currently the main limiting factor in increasing fiber power is nonlinear effects. One of the effective ways to solve the nonlinear effect is to increase the core area of ​​the gain fiber. However, due to the limitation of current MCVD and other technologies, without using other mode filtering technologies (such as bending fiber, scramblin...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G02B6/036C03B37/012C03B37/025
Inventor 王飞龙陈丹平李文涛胡丽丽
Owner SHANGHAI INST OF OPTICS & FINE MECHANICS CHINESE ACAD OF SCI
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