Fiberhome Telecommunication Technologies Co., Ltd

Wuhan Research Institute of Posts and Telecommunications

Ruiguang Telecommunication Technologies Co., Ltd

Fiberhome Fujikura Optic Technology Co., Ltd

Wuhan Research Institute of Post and Telecommunications

Cheng Du

Tao Zhang

Qi Mo

Wenyong Luo

Yili Ke

Chao Chen

Wen Qing Chen

Wei Chen

Wei Li

Shiyu Li

Ming Kong

Dongxiang Wang

Jie Zhang

Qiong Lei

Zhijian Liu

Rong Dan

Bingfeng Cai

Huang Yu

Zhiqiang Yu

Qiao Zhu

Lifeng Liu

Kun Du

Lei Yan

Wei Qi

Shujian Wu

Bi Wang

Zisen Zhao

Feng Qian

Fanqiu Zeng

Baoping Chen

Guohua Hu

Maoyou He

Shuai Shao

A method for preparing a doped optical fibre preform includes formulating, a rare earth material or a functional metal material and a co-doping agent into a doping solution, mixing a high-purity quartz powder with the doping solution, drying same at a temperature of 100&#xb0; C.-150&#xb0; C. for 12-48 hours, crushing and screening the same to obtain a doped quartz powder; depositing the doped quartz powder onto the surface of a target rod to form a doped core layer; replacing the doped quartz powder with the high-purity quartz powder, and depositing the high-purity quartz powder onto the surface of the doped core layer to form a quartz outer cladding; and removing the target rod, and gradually collapsing the entirety formed from the doped core layer and the quartz outer cladding at a high temperature to obtain the doped optical fibre preform.

Method for efficiently preparing doped optical fibre preform and doped optical fibre preform

A low-loss few-mode fiber relates to the technical field of optical communications and related sensing devices, and includes, from inside to outside, a core layer (), a fluorine-doped quartz inner cladding (), a fluorine-doped quartz second core layer (), a fluorine-doped quartz depressed cladding () and a fluorine-doped quartz outer cladding (); germanium element is not doped within the core layer (), the refractive index of the core layer () is in gradient distribution, and the distribution is a power-exponent distribution; the maximum value of difference in relative refractive index between the core layer () and the fluorine-doped quartz inner cladding () is 0.3% to 0.9%; the relative refractive index difference of the fluorine-doped quartz inner cladding () with respect to synthetic quartz is &#x2212;0.3% to &#x2212;0.5%; the difference in relative refractive index between the fluorine-doped quartz second core layer () and the fluorine-doped quartz inner cladding () is 0.05% to 0.2%; the difference in relative refractive index between the fluorine-doped quartz depressed cladding () and the fluorine-doped quartz inner cladding () is &#x2212;0.1% to &#x2212;0.5%; the relative refractive index difference of the fluorine-doped quartz outer cladding () with respect to synthetic quartz is &#x2212;0.3% to &#x2212;0.5%. The transmission loss of optical signals of the linear polarization modes that are supported by the few-mode fiber and the relay cost are reduced.

Low-loss few-mode fiber

Provided are a high-efficiency parallel-beam laser optical fiber drawing method and optical fiber, the method including the steps of: S: providing base planes on the side surfaces of both a gain optical fiber preform and a pump optical fiber preform, inwardly processing the base plane of the gain optical fiber preform to make a plurality of ribs protrude, and inwardly providing a plurality of grooves on the base plane of the pump optical fiber preform; S: embedding the ribs into the grooves, tapering and fixing one end of the combination of the ribs and the grooves to form a parallel-beam laser optical fiber preform; S: drawing the parallel-beam laser optical fiber preform into parallel-beam laser optical fibers. The process has high repeatability, and the obtained parallel-beam laser achieves peelability of pump optical fibers in a set area, thus facilitating multi-point pump light injection of parallel-beam laser optical fibers.

High-efficiency parallel-beam laser optical fibre drawing method and optical fibre

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Wuhan, China

Cheng Du