Fiberhome Telecommunication Technologies Co., Ltd

Wuhan Research Institute of Posts and Telecommunications

Wuhan Fiberhome Ruiguang Technology Co., Ltd

Wuhan Research Institute of Post and Telecommunications

Qi Mo

Wen Qing Chen

Wenyong Luo

Yili Ke

Cheng Du

Dongxiang Wang

Huang Yu

Rong Dan

Zhiqiang Yu

Bingfeng Cai

Wei Chen

Tao Zhang

Lei Zhao

Shiyu Li

Qiong Lei

Fuming Hu

Zhijian Liu

Lijie Huang

Zhiwen Kang

Cheng Liu

Kun Du

Liming Chen

Huiping Shi

The present invention relates to the field of single-mode optical fibers and discloses a bending-insensitive, radiation-resistant single-mode optical fiber, sequentially including from inside to outside: a core, inner claddings, and an outer cladding, all made from a quartz material. The inner claddings comprise, from inside to outside, a first fluorine-doped inner cladding and a second fluorine-doped inner cladding. The core and the first fluorine-doped inner cladding are not doped with germanium. The respective concentrations of other metal impurities and phosphorus are less than 0.1 ppm. By mass percent, the core has a fluorine dopant content of 0-0.45% and a chlorine content of 0.01-0.10%; the first fluorine-doped inner cladding has a fluorine concentration of 1.00-1.55%; and the second fluorine-doped inner cladding has a fluorine concentration of 3.03-5.00%.

Bending-insensitive, radiation-resistant single-mode optical fiber

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

Disclosed is a small-diameter polarization maintaining optical fiber, which relates to the field of special optical fibers. The small-diameter polarization maintaining optical fiber comprises a quartz optical fiber (); the periphery thereof is provided with an inner coating () and an outer coating (); the interior of the quartz optical fiber () is provided with an optical fiber core layer () and a quartz cladding (); two stress zones () are arranged between the optical fiber core layer () and the quartz cladding (); a buffer coating () is arranged between the inner coating () and the outer coating (); the periphery of each stress zone () is provided with a buffer layer () which is concentric with the stress zone (); when a working wavelength of a small-diameter polarization maintaining optical fiber is 1310 nm, the attenuation thereof reaches less than 0.5 dB/km, and the crosstalk reaches &#x2212;35 dB/km; and when the working wavelength of the small-diameter polarization maintaining optical fiber is 1550 nm, the attenuation thereof reaches less than 0.4 dB/km, and the crosstalk reaches &#x2212;30 dB/km. The optical fiber not only has excellent stability characteristics of attenuation and crosstalk, but also has the excellent stability characteristic of long-term operation, and can provide a better optical fiber ring for research on a high-precision optical fiber gyroscope, thereby laying the foundation for the development directions of miniaturization and high precision of the optical fiber gyroscope.

Small-diameter polarization maintaining optical 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

Qi Mo