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Ytterbium-doped optical fiber, preform and preparation method thereof

A technology of ytterbium-doped optical fiber and preform, which is applied in glass manufacturing equipment, manufacturing tools, etc., can solve the problems of irregular optical fiber profile, irregular core rod profile, and reduce the volatility of P2O5, so as to ensure the refractive index profile and increase the doping Effect of impurity efficiency and improvement of darkening performance

Pending Publication Date: 2022-04-29
YANGTZE OPTICAL FIBRE & CABLE CO LTD
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  • Abstract
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  • Application Information

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Problems solved by technology

The present invention reduces the concentration difference of P2O5 in the liner in the shrinkage stage by injecting POCl3 during the shrinkage, thereby reducing the volatility of P2O5, and can effectively solve the problem of irregular mandrel cross-section in the high-phosphorus-doped system. However, excessive or slight P2O5 Deposition will also lead to irregular fiber profiles, so it is necessary to have exact requirements for melting temperature, pressure, time, POCl3 flow, etc.

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  • Ytterbium-doped optical fiber, preform and preparation method thereof
  • Ytterbium-doped optical fiber, preform and preparation method thereof

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preparation example Construction

[0035] The invention provides a method for preparing an ytterbium-doped optical fiber preform. The purpose of the method is to improve the element distribution uniformity of the section of the ytterbium-doped optical fiber preform, so as to effectively ensure the smoothness of the section refractive index. The present invention reduces the concentration difference of P2O5 in the liner in the shrinkage stage by injecting POCl3 during the shrinkage, thereby reducing the volatility of P2O5, and can effectively solve the problem of irregular cross-section of mandrel rods in high phosphorus-doped systems, but excessive or slight deposition of P2O5 , will also lead to irregular optical fiber profiles, so it is necessary to have exact requirements for melting temperature, pressure, time, POCl3 flow rate, etc. This method specifically includes the following steps:

[0036] S1: Deposition of a doped silica layer within a quartz liner comprising:

[0037] Using the MCVD vapor deposition...

Embodiment 1

[0052] S1: Fix the pure quartz glass liner with the specifications of 30mm (outer diameter)*3mm (wall thickness)*750mm (tube length) on the MCVD lathe, first deposit Si+P+F outer cladding, the deposition temperature is 2000°C, The flow rate of O2 is 1200sccm, the flow rate of SiCl4 is 500sccm, the flow rate of POCl3 is 150sccm, and the flow rate of C2F6 is 10sccm. After the outer cladding is deposited, the inner cladding is deposited at a deposition temperature of 1900°C. The flow rate of C2F6 is 4 sccm, the carrier gas flow rate of Yb(thmd)3 is 300 sccm, and the carrier gas flow rate of AlCl3 is 100 sccm. According to the designed core diameter, 30 layers are deposited repeatedly;

[0053] S2: After the deposition is completed, enter the melting and shrinking stage, the moving speed of the main lamp is 150mm / min, the flow rate of H2 is 70slm, the flow rate of H2 is 35slm, the pressure is 80Pa, and POCl3 is introduced and deposited in the forward direction (the moving direction...

Embodiment 2

[0056] S1: Fix the pure quartz glass liner with the specifications of 30mm (outer diameter)*3mm (wall thickness)*750mm (tube length) on the MCVD lathe, first deposit Si+P+F outer cladding, the deposition temperature is 2000°C, The flow rate of O2 is 1200sccm, the flow rate of SiCl4 is 500sccm, the flow rate of POCl3 is 150sccm, and the flow rate of C2F6 is 10sccm. After the outer cladding is deposited, the inner cladding is deposited at a deposition temperature of 1900°C. The flow rate of C2F6 is 4 sccm, the carrier gas flow rate of Yb(thmd)3 is 300 sccm, and the carrier gas flow rate of AlCl3 is 100 sccm. According to the designed core diameter, 30 layers are deposited repeatedly;

[0057] S2: After the deposition is completed, enter the melting and shrinking stage, the moving speed of the main lamp is 150mm / min, the flow rate of H2 is 70slm, the flow rate of H2 is 35slm, the pressure is 80Pa, and POCl3 is introduced and deposited in reverse (the moving direction of the main l...

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Abstract

The invention provides an ytterbium-doped optical fiber, a preform and a preparation method of the ytterbium-doped optical fiber, and the method comprises the following steps: introducing raw material gas into a quartz liner tube by adopting an MCVD (modified chemical vapor deposition) process, and performing reciprocating motion along a tube axis by taking an oxyhydrogen flame main lamp as a heat source so as to deposit the raw material gas in the tube to form a plurality of silicon dioxide layers containing a co-doping agent; wherein the raw material gas comprises POCl3 gas, and the carrier gas flow of the POCl3 gas is 1-1000 sccm; adopting an MCVD (modified chemical vapor deposition) process, and enabling an oxyhydrogen flame main lamp as a heat source to reciprocate along a tube shaft so as to gradually melt and shrink the deposited quartz liner tube; in the melting shrinkage process, POCl3 gas is introduced into the deposited quartz liner tube at the same time, so that phosphorus is deposited on the inner wall of the tube in the forward direction or the reverse direction; wherein the carrier gas flow of the POCl3 gas is 5 to 500 sccm. According to the method, POCl3 is introduced during melting shrinkage, so that the concentration difference of P2O5 in the liner tube in the melting shrinkage stage is reduced, and meanwhile, the melting shrinkage temperature, pressure, time and POCl3 flow process are optimized, so that the problem that the profile of the high phosphorus-doped system core rod is irregular is effectively solved.

Description

technical field [0001] The invention belongs to the technical field of optical fiber cable preparation, and in particular relates to an ytterbium-doped optical fiber, an ytterbium-doped optical fiber prefabricated rod and a preparation method thereof. Background technique [0002] At present, ytterbium-doped fiber lasers are mainly used in laser welding, laser cleaning, and precision manufacturing applications. These applications require pulsed lasers with higher output power and greater single-pulse energy. Therefore, how to further increase the output power of fiber lasers has always been a key research. direction. With the further increase in the power requirements of fiber lasers, Yb-doped fibers, the most important part of lasers, face enormous challenges, including thermal stability degradation caused by fiber loss and power stability degradation caused by photon darkening effects, etc. [0003] Thermal stability is one of the key issues in the study of high-power fib...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C03B37/018C03B37/027C03C13/04
CPCC03B37/01815C03B37/01853C03B37/01861C03B37/027C03C13/04
Inventor 汪亨郑伟钟力袁飚孟悦杨晨石旭东
Owner YANGTZE OPTICAL FIBRE & CABLE CO LTD
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