Rare earth-doped optical fiber perform and preparation method thereof

An optical fiber preform and rare earth technology, which is applied to glass manufacturing equipment, manufacturing tools, etc., can solve the problems of low efficiency, large heat generation, and low longitudinal uniformity of optical fiber preforms.

Active Publication Date: 2014-09-24
SHENZHEN XINAOKE CABLE
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  • Claims
  • Application Information

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Problems solved by technology

The rare earth-doped optical fiber preform prepared by this method is used on the laser after drawing, and it is found that there are problems such as light leakage, large loss, low efficiency, large calorific value, and photon darkening; in addition, the longitudinal direction of the optical fiber preform prepared by this method Lower uniformity reduces the effective length of the fiber preform

Method used

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  • Rare earth-doped optical fiber perform and preparation method thereof
  • Rare earth-doped optical fiber perform and preparation method thereof
  • Rare earth-doped optical fiber perform and preparation method thereof

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preparation example Construction

[0027] The invention provides a method for preparing an optical fiber preform, comprising the following steps:

[0028] 1) depositing a loose core layer on the inner surface of the quartz deposition tube;

[0029] 2) Soak the quartz deposition tube with a loose core layer deposited on the inner surface obtained in step 1) in a solution containing rare earth elements, and after the head of the quartz deposition tube is soaked, the The solution is released according to the release rate obtained by formula a;

[0030] Release speed (mm / min) = L / (3h×L / 400mm-280h (mm / min) / V) / 60 Formula a;

[0031] In formula a, L is the length of the quartz deposition tube in the step 1), and the unit is mm;

[0032] V is the deposition velocity of depositing the loose core layer on the inner surface of the quartz deposition tube in the step 1), in mm / min;

[0033] 3) Drying, sintering and shrinkage of the quartz deposition tube soaked in step 2) in sequence to obtain a rare earth-doped optical ...

Embodiment 1

[0065] First, weld one end of the 1200mm quartz deposition tube to the handle tube, then install the tail tube on the chuck on the other side, and weld the other end of the deposition tube to the tail tube after straightening; lock the tailstock to avoid deposition Process movement, move the upper limit and lower limit respectively to the corresponding position;

[0066] Start the recipe program, the PLC controls the computer to synchronize with the equipment, and runs in the order of etching, inner cladding deposition, pre-shrinking, and loose core layer deposition, in which the inner cladding layer is deposited 9 layers, the components are Si-F-P three systems, and the raw materials are SiCl respectively. 4 , SF 6 and POCl 3 ;

[0067] The deposition speed of the loose core layer is 135mm / min. After the deposition of the loose core layer is completed, the formula program is closed. When the internal pressure drops to a negative value, the connection between the deposition ...

Embodiment 2

[0073] First, weld one end of the 400mm quartz deposition tube to the handle tube, then install the tail tube on the chuck on the other side, and weld the other end of the deposition tube to the tail tube after straightening; lock the tailstock to prevent the deposition process Move, move the upper limit and lower limit respectively to the corresponding position;

[0074] Start the recipe program, the PLC controls the computer to synchronize with the equipment, and runs in the order of etching, inner cladding deposition, pre-shrinking, and loose core layer deposition, in which the inner cladding layer is deposited 9 layers, the components are Si-F-P three systems, and the raw materials are SiCl respectively. 4 , SF 6 and POCl 3 , the deposition speed of the loose core layer is 140mm / min. After the deposition of the loose core layer is completed, the recipe program is closed. When the internal pressure drops to a negative value, the connection between the quartz deposition tub...

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Abstract

The invention provides a preparation method of a rare earth-doped optical fiber perform. The method comprises the following steps: 1) depositing a loose core layer on the inner surface of a quartz deposit tube; 2) soaking the quartz deposit tube with the loose core layer deposited on the inner surface obtained in the step 1) into a solution containing a rare-earth element, and releasing the solution containing the rare-earth element at the release speed obtained in the formula a after soaking the head of the quartz deposit tube, wherein the release speed (mm/min) is L/(3h*L/400mm-280h.(mm/min)/V)/60 in the formula a; 3) sequentially drying, sintering and melting the quartz deposit tube soaked in the step 2), so as to obtain the rare earth-doped optical fiber perform. The release speed of the solution containing the rare-earth element is controlled according to the formula a, the doping longitudinal uniformity of the rare-earth element is improved, and energy loss caused by a rare-earth ion cluster is also avoided, so that the longitudinal optical fiber uniformity of the optical fiber perform is improved.

Description

technical field [0001] The invention belongs to the field of optical fiber preforms, in particular to a rare earth-doped optical fiber preform and a preparation method thereof. Background technique [0002] Optical fibers are drawn in proportion from optical fiber preforms, which usually consist of a core with a higher refractive index and a cladding with a lower refractive index. At present, optical fiber is mainly used for communication transmission. [0003] In the prior art, there are several methods for producing optical fiber preforms, which can be divided into two categories according to the manufacturing method of the optical fiber refractive index profile: outside the tube deposition method, including the vapor axial deposition method (vapor axial deposition method) , VAD) and outside vapor deposition (outside vapor deposition, OVD); tube deposition method: including modified chemical vapor deposition (modified chemical vapor deposition, MCVD) and plasma chemical v...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C03B37/014
CPCC03B37/01838C03B2201/34
Inventor 马静杨军勇冯高锋葛锡良章海峰陈坚盾董瑞洪
Owner SHENZHEN XINAOKE CABLE
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