Single-mode fiber

Abstract

A single-mode fiber disclosed by the present invention comprises a core layer and a cladding. The core layer is a silicon dioxide quartz glass doped with germanium and fluorine, the diameter Dcore of the core layer is between 6.5 micrometers and 7.5 micrometers, and the range of a relative refractive index delta 1 of the core layer is between 0.70% and 0.75%. The cladding comprises two layers, the inner layer is the silicon dioxide quartz glass doped with germanium, the outer layer is a pure silicon dioxide quartz glass, and the range of the diameter Dclad of the cladding is between 124 micrometers and 126 micrometers. The cut-off wavelength of the fiber of the present invention is between 1300 nanometers and 1460 nanometers, a working wavelength range is 1550 nanometers, the MFD is between 7.0 micrometers and 7.6 micrometers, and the fiber attenuation is less than 0.26dB / km(at 1550 nanometers). The fiber of the present invention possesses a better bending resistance, and the macrobend loss of the fiber is less than 0.02dB(Phi10mm25 laps). The fiber has a good bending resistance when being wound into a device of a small size, and the macrobend loss of the fiber is less than 0.03dB(Phi15mm400 laps).

Description

technical field [0001] The invention belongs to the field of optical fiber technology, and more specifically relates to a single-mode optical fiber. Background technique [0002] Single-mode fiber has the advantages of light weight, small size, anti-electromagnetic interference, fast transmission rate, large information capacity and long transmission distance. Worldwide, G.652 single-mode optical fibers have been laid and applied in large quantities in optical communication networks. With the continuous development of special optical fiber and its application technology, optical fiber has been more and more widely used in fields other than conventional communication. In special optical fiber devices, in order to achieve the purpose of use, an optical fiber with stable transmission performance in this environment is required, and ordinary G.652 single-mode optical fibers cannot work normally for a long time under small-sized special devices. [0003] The bending resistance ...

AI Technical Summary

Problems solved by technology

[0004] In the patent CN102998742B, a high germanium-doped fiber structure is proposed to achieve bending insensitivity. However, too much germanium doped in the fiber core layer leads to high fiber loss, and the attenuation at 1550nm wavelength is as high as 0.3dB / km

[0005] In the patent CN101373238B, high-doped germanium and three-layer cladding structure are used to achieve bending insensitivity. However, in order to adapt to the wavelength of 1310nm, its bending ability still cannot meet the requirements of devices with small diameter and multiple turns.

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