Rare earth doped optical fiber preformed rod and preparation method thereof

A technology of optical fiber preform and rare earth doping, which is applied in the direction of glass manufacturing equipment, glass fiber products, manufacturing tools, etc., can solve the problems of large differences in optical fiber parameters, and achieve concentricity, reduce wire diameter fluctuations, and easy control Effect
CN107500524AActive Publication Date: 2017-12-22YANGTZE OPTICAL FIBRE & CABLE CO LTD
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
YANGTZE OPTICAL FIBRE & CABLE CO LTD
Publication Date
2017-12-22

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Abstract

The invention discloses a doped optical fiber preformed rod and a preparation method thereof. The preformed rod comprises a doped core layer, a first quartz cladding layer and a second quartz cladding layer from inside to out; the numerical aperture of the second quartz cladding layer relative to the first quartz cladding layer ranges from 0.1 to 0.24; the section of the second quartz cladding layer is round. The doped optical fiber preformed rod is prepared according to the following method: (1) wrapping the doped core layer with the first quartz cladding layer material, stretching until the section area ratio is matched with the section area ratio of the second quartz cladding layer, and processing the section into predetermined appearance to obtain a preformed rod semi-finished product; (2) wrapping the preformed rod semi-finished product with the second quartz cladding layer material and processing the section into round to obtain the doped optical fiber preformed rod. The optical fiber preformed rod provided by the invention facilitates wire-drawing forming and pump light leakage is greatly reduced; according to the preparation method, the geometric concentricity of the preformed rod can be guaranteed and the consistency of the optical fiber production batches is improved.
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Description

technical field

[0001] The invention belongs to the field of optical fiber laser technology, and more specifically relates to a rare earth-doped optical fiber prefabricated rod for lasers and a preparation method thereof. Background technique

[0002] Fiber laser is a kind of laser that uses optical fiber as laser gain medium. By doping different rare earth ions in the fiber quartz matrix, laser output in different bands can be obtained. Due to the advantages of high beam quality, large specific surface area, good heat dissipation, high conversion efficiency, small size, compact structure, and easy maintenance, fiber lasers are widely used in many fields such as industrial processing, medical treatment, military affairs, and communications.

[0003] The single-clad rare-earth-doped fiber was used in the early stage, and the pump light was required to be injected directly into the fiber core. When the pump power gradually increased, it was difficult to further improve the pum...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
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