Quartz base bismuth gallium erbium aluminium codoped optical fiber and its production method

A production method, quartz technology, applied in the direction of manufacturing tools, glass manufacturing equipment, etc., to achieve the effect of shortening length, improving cleanliness and maintaining gain efficiency

Inactive Publication Date: 2007-07-11
BEIJING JIAOTONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] However, in optical fiber communication systems, almost all optical fibers are silica-based, so bismuth-based erbium-doped optical fibers are difficult to be applied in actual optical fiber systems, and silica-based optical fibers have good compatibility, small fusion loss, and heat resistance. Good advantages have been widely used

Method used

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  • Quartz base bismuth gallium erbium aluminium codoped optical fiber and its production method
  • Quartz base bismuth gallium erbium aluminium codoped optical fiber and its production method

Examples

Experimental program
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Effect test

Embodiment 1

[0026] A barrier layer is first deposited in the ultrapure quartz tube by using a modified chemical vapor deposition method (MCVD), and the refractive index of the barrier layer is consistent with the refractive index of the quartz tube. Then deposit the innermost layer, that is, the core layer. The temperature of the deposited core layer is relatively low, between 1200°C and 1300°C. The deposited core layer is a loose (foamy) white opaque layer. The raw material for depositing the loose layer is Silicon tetrachloride (SiCl 4 ) and oxygen (O 2 ), the obtained loose layer composition is only silicon dioxide (SiO 2 ). Then use the online doping method to soak the loose layer in the pre-prepared mixed solution of bismuth, gallium, erbium and aluminum, and continue soaking for about one hour after the opaque loose layer becomes transparent.

[0027] Before soaking, the key is to prepare a high-purity mixed salt solution, and the doping composition of the salt solution is also t...

Embodiment 2

[0032] The MCVD method is used to deposit the barrier layer in the pure quartz tube, and then start to deposit the loose layer. When depositing the fiber core loose layer, the raw material gas is composed of silicon tetrachloride (SiCl 4 ), germanium tetrachloride (GeCl 4 ) and oxygen (O 2 ), a mixture of silicon dioxide and germanium dioxide is formed by high-temperature reaction, wherein germanium dioxide is mainly used to increase the refractive index of the core area, and at the same time reduce the temperature when depositing the loose layer, and appropriately change the quartz network structure. When the loose layer in the core area is made of a mixture of silicon dioxide and germanium dioxide, the concentration of bismuth, gallium, erbium, and aluminum prepared in the solution doping process should be appropriately lowered because the doping of germanium increases the refractive index of the fiber core. .

[0033] Following the same steps as in Example 1: solution pre...

Embodiment 3

[0035] The MCVD method is used to deposit the barrier layer in the pure quartz tube, and then start to deposit the loose layer. When depositing the fiber core loose layer, the raw material gas is composed of silicon tetrachloride (SiCl 4 ), sulfur hexafluoride (SF 6 ) and oxygen (O 2 ), a mixture of silicon dioxide and silicon oxyfluoride is formed by high temperature reaction. Since doping with fluorine reduces the refractive index of the fiber core, the concentration of bismuth, gallium, erbium, and aluminum can be appropriately increased during the doping process to make the fiber core have a suitable refractive index. When the concentrations of bismuth, gallium, erbium, and aluminum solutions are not increased, this fluorine-doped silica-based fiber core has a lower refractive index than pure silica-based fiber cores, and is more suitable for making optical fibers with large effective core areas. In cladding-pumped high-power fiber lasers and amplifiers.

[0036] Simila...

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Abstract

The invention discloses a quartz-based doped bismuth gallium erbium aluminium optical fiber and making method, which is characterized by the following: displaying high adsorbing coefficient over 58dB / m at 1530nm; shortening the length of doped optical fiber to less than one tenth; realizing flat gain spectrum.

Description

technical field [0001] The invention relates to a quartz-based bismuth-gallium-erbium-aluminum co-doped optical fiber and a manufacturing method thereof, which are particularly suitable for the manufacture of rare earth-doped special optical fibers and belong to the field of optical fiber communication. Background technique [0002] Erbium-doped fiber amplifier has been widely used in the field of optical fiber communication, and it is an extremely important device in the optical fiber communication system. However, the erbium-doped fiber amplifier made of ordinary quartz-based erbium-doped fiber has large fluctuations in the gain spectrum, reaching more than 10dB. [0003] At the same time, the erbium ion concentration of the erbium-doped optical fiber used in the current quartz-based erbium-doped optical fiber amplifier is relatively low, so the use length is very long, which makes the cost of the erbium-doped optical fiber amplifier (EDFA) higher. The absorption coeffici...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C03B37/018
CPCC03B2201/30C03B37/01838C03B2201/36
Inventor 傅永军简水生李坚魏淮郭铁英
Owner BEIJING JIAOTONG UNIV
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