US 11,780,768 B2
Photodarkening-resistant ytterbium-doped quartz optical fiber and preparation method therefor
Lili Hu, Shanghai (CN); Fengguang Lou, Shanghai (CN); Chunlei Yu, Shanghai (CN); Meng Wang, Shanghai (CN); Lei Zhang, Shanghai (CN); Xiaoqing Xu, Shanghai (CN); Danping Chen, Shanghai (CN); Fan Wang, Shanghai (CN); and Mengting Guo, Shanghai (CN)
Assigned to SHANGHAI INSTITUTE OF OPTICS AND FINE MECHANICS, CHINESE ACADEMY OF SCIENCES, Shanghai (CN)
Appl. No. 16/972,358
Filed by Shanghai Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, Shanghai (CN)
PCT Filed Jun. 6, 2019, PCT No. PCT/CN2019/090432
§ 371(c)(1), (2) Date Dec. 4, 2020,
PCT Pub. No. WO2019/233487, PCT Pub. Date Dec. 12, 2019.
Claims priority of application No. 201810587237.2 (CN), filed on Jun. 6, 2018.
Prior Publication US 2021/0230051 A1, Jul. 29, 2021
Int. Cl. C03C 13/04 (2006.01); C03B 37/018 (2006.01); C03B 37/025 (2006.01); G02B 6/036 (2006.01)
CPC C03C 13/046 (2013.01) [C03B 37/018 (2013.01); C03B 37/025 (2013.01); G02B 6/036 (2013.01); C03B 2203/32 (2013.01)] 10 Claims
OG exemplary drawing
 
1. A preparation method for a photodarkening-resistant ytterbium-doped silica optical fiber, wherein, the preparation method at least includes: applying a sol-gel method and an immersion method to an improved chemical vapor deposition method to prepare a ytterbium-aluminum-phosphorus-doped silica soot body, and then after dehydration, decarburization, collapse, and drawing, a photodarkening-resistant silica optical fiber is finally prepared, wherein a silica transparent sol solution is obtained by at least the following step
S1: first weighing an ytterbium source, aluminum source, and phosphoric acid according to preset molar percentages, then preparing a mixed solution of ethyl orthosilicate, water, and ethanol, and finally adding the ytterbium source, aluminum source, and phosphoric acid in sequence into the mixed solution, and after the mixed solution is fully mixed, the silica transparent sol solution can be obtained,
wherein preparing the ytterbium-aluminum-phosphorus-doped silica soot body comprises the following steps:
S2: Polishing, injecting sulfur hexafluoride and oxygen into a deposition tube, then heating the deposition tube to 2000° C., and chemically polishing the inner wall of the deposition tube;
S3: Depositing, injecting silicon tetrachloride and oxygen to the polished deposition tube, heating the deposition tube to 1400-1600° C., and depositing silica soot body;
S4: Soaking, immersing part of the deposition tube in the silica transparent sol solution described in step S1 to obtain the ytterbium-aluminum-phosphorus-doped silica soot body.