Title:
LARGE-SIZE LOW-ATTENUATION OPTICAL FIBER PREFORM AND PREPARATION METHOD THEREFOR
Document Type and Number:
WIPO Patent Application WO/2020/181791
Kind Code:
A1
Abstract:
Disclosed are a large-size low-attenuation optical fiber preform and a preparation method therefor. The method comprises: preparing a preform core rod comprising an inner core layer, an outer core layer, an inner cladding layer, and a depressed layer by using an MCVD process, then depositing a first outer cladding loose body by means of a VAD process and preparing a primary optical fiber preform by means of primary sintering treatment, and finally depositing a second outer cladding loose body by means of an OVD process and obtaining an optical fiber preform by means of secondary sintering treatment. The diameter of the prepared optical fiber preform may be up to 215 mm, the fiber pulling length of a single preform may be up to 2930 km, the attenuation coefficient of an optical fiber at a wavelength of 1310 nm is as low as 0.298 dB/km, the attenuation coefficient of the optical fiber at a wavelength of 1383 nm is as low as 0.265 dB/km, the attenuation coefficient of the optical fiber at a wavelength of 1550 nm is as low as 0.165 dB/km, and the cutoff wavelength of the optical fiber is from 1265 nm to 1273 nm.
Inventors:
MO SIMING (CN)
LI FAN (CN)
XI LIHONG (CN)
ZHANG GUODONG (CN)
ZHOU LI (CN)
LI XIANG (CN)
LI FAN (CN)
XI LIHONG (CN)
ZHANG GUODONG (CN)
ZHOU LI (CN)
LI XIANG (CN)
Application Number:
PCT/CN2019/114407
Publication Date:
September 17, 2020
Filing Date:
October 30, 2019
Export Citation:
Assignee:
JIANGSU ETERN COMPANY LTD (CN)
International Classes:
C03B37/018; C03B37/014
Foreign References:
| CN109970335A | 2019-07-05 | |||
| CN101891380A | 2010-11-24 | |||
| CN101891380A | 2010-11-24 | |||
| CN105217951A | 2016-01-06 | |||
| CN1483007A | 2004-03-17 | |||
| US20120033924A1 | 2012-02-09 |
Attorney, Agent or Firm:
SUZHOU ZHITU INTELLECTUAL PROPERTY FIRM (CN)
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