Low-loss optical fiber and manufacturing method thereof

Abstract

The invention discloses a low-loss optical fiber and a manufacturing method of the low-loss optical fiber, and relates to the field of optical fibers. The low-loss optical fiber comprises a step change waveguide; the step change waveguide comprises a core layer, a core cladding transition layer, a core cladding interface transition layer, a deep fluorine-doped cladding, a cladding sleeve transition layer, a cladding sleeve interface transition layer and a sleeve layer, wherein the core layer, the core cladding transition layer, the core cladding interface transition layer, the deep fluorine-doped cladding, the cladding sleeve transition layer, the cladding sleeve interface transition layer and the sleeve layer are arranged in sequence from inside to outside; the core layer is made of a pure silicon core slightly doped with fluorine or boron, wherein the relative refringence between the core layer and the pure silicon core is 0-0.1%; the deep fluorine-doped cladding is made of pure silicon dioxide deeply doped with fluorine, wherein the relative refringence between the deep fluorine-doped cladding and the core layer is 0.24%-0.28%; the refractivity in the core cladding transition layer is distributed in a gradient change mode according to a parabola curve, wherein the range of the absolute value of stress coefficients is from 0.005 to 0.015; the base point temperature rises gradually from 900-950 DEG C to 1150-1200 DEG C. The attenuation coefficient of the low-loss optical fiber manufactured according to the manufacturing method can be reduced to less than 0.158 dB / km in a 1550 nm wave band.

Description

technical field [0001] The invention relates to the field of optical fibers, in particular to a low-loss optical fiber and a manufacturing method thereof. Background technique [0002] With the development of optical fiber communication technology towards 100G, 400G ultra-high-speed and large-capacity communication technology, the attenuation requirements for optical fiber are getting higher and higher. In my country, due to the complex terrain and vast territory, optical fiber communication tends to develop towards large capacity and ultra-long station distance. The emergence of a station distance of more than 300km or even 400km poses a serious challenge to the traditional ultra-long station distance optical communication system. In the actual long-distance, large-capacity, high-speed transmission system, the ASE (Amplified Spontaneous Emission, amplified spontaneous emission) noise of the optical amplifier will inevitably damage the system. The influence is more obvious...

AI Technical Summary

Problems solved by technology

The emergence of a station distance of more than 300km or even 400km poses a severe challenge to the traditional ultra-long station distance optical communication system

Due to the different attenuation of various modes transmitted in the optical fiber, during the long-distance mode conversion process, the mode with small attenuation becomes the mode with large attenuation. After continuous conversion and inverse conversion, although the loss of each mode will be balanced, but The overall mode produces additional loss, that is, the additional loss is generated due to the conversion of the mode, and this additional loss is the waveguide scattering loss

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