US 11,053,157 B2
Optical fiber and manufacturing method thereof
Haibin Chen, Chengdu (CN); Jian Chen, Chengdu (CN); Qiang Chen, Chengdu (CN); Qingguo Li, Chengdu (CN); and Xiaosong Jian, Chengdu (CN)
Assigned to CHENGDU FUTONG OPTICAL COMMUNICATION TECHNOLOGIES CO., LTD, Chengdu (CN)
Appl. No. 16/322,122
Filed by Chengdu Futong Optical Communication Technologies Co., Ltd., Chengdu (CN)
PCT Filed Aug. 23, 2017, PCT No. PCT/CN2017/098588
§ 371(c)(1), (2) Date Jan. 31, 2019,
PCT Pub. No. WO2019/036925, PCT Pub. Date Feb. 28, 2019.
Prior Publication US 2020/0270165 A1, Aug. 27, 2020
Int. Cl. C03B 37/014 (2006.01); C03B 37/027 (2006.01); G02B 6/036 (2006.01)
CPC C03B 37/01473 (2013.01) [C03B 37/01446 (2013.01); C03B 37/027 (2013.01); C03B 2201/12 (2013.01); C03B 2203/23 (2013.01); C03B 2207/50 (2013.01); C03B 2207/62 (2013.01); C03B 2207/64 (2013.01); C03B 2207/81 (2013.01); G02B 6/036 (2013.01)] 13 Claims
OG exemplary drawing
 
1. A manufacturing method for an optical fiber, comprising
using a hollow glass tube as a target rod, adopting a vapor phase axial deposition (VAD) to make a core rod loose body with a core layer loose body, a silicon dioxide isolation layer, and a cladding layer loose body sequentially arranged from inside out, and using a first blowtorch, a second blowtorch, and a third blowtorch for deposition;
forming the core layer loose body using the first blowtorch, wherein gases entering the first blowtorch are H2, O2, Ar, and SiCl4;
forming the silicon dioxide isolation layer using the second blowtorch, wherein gases entering the second blowtorch are H2 and O2, a flow rate of H2 entering the second blowtorch is in a range of 12-15 L/min, and a flow rate of O2 entering the second blowtorch is in a range of 10-12 L/min;
forming the cladding layer loose body using the third blowtorch, wherein gases entering the third blowtorch are H2, O2, Ar, SiCl4, and CF4; and wherein the hollow glass tube comprises a hollow tube body and an open deposition tip communicating with a tail end of the hollow tube body, and the core layer loose body is connected with the open deposition tip;
dehydrating the core rod loose body, wherein a dehydration atmosphere enters the core layer loose body through the hollow glass tube and penetrates from an outside to an inside of the cladding layer loose body, and a dehydrated core rod loose body is obtained;
sequentially sintering, extending, and washing corrosively the dehydrated core rod loose body and forming an outer cladding layer on a surface to obtain a preform; and
drawing the preform to obtain an optical fiber;
wherein the open deposition tip is conical, a length of the open deposition tip is in a range of 20-22 mm, a hole with a diameter in a range of 6-7 mm is provided at the open deposition tip, an inner diameter of the hollow tube body is in a range of 30-31 mm, and an outer diameter of the hollow tube body is in a range of 32-34 mm;
wherein a pressure at which the dehydration atmosphere enters the core layer loose body through the hollow glass tube is in a range of 80-90 psi, and a pressure at which the dehydration atmosphere penetrates from an outside to an inside of the cladding layer loose body is in a range of 35-45 psi.