A single-mode optical fiber with ultra-low attenuation and large effective area

Abstract

The invention discloses a single-mode optical fiber with ultra-low attenuation and large effective area, which comprises a core layer, a first cladding layer, a second cladding layer, a third cladding layer and a fourth cladding layer arranged sequentially from inside to outside; the first cladding layer Fluorine-doped quartz is used; the second cladding, the third cladding and the fourth cladding are made of quartz; the third cladding is provided with at least one annular microporous layer arranged sequentially from the inside to the outside, and the annular microporous layer includes uniform A plurality of micropores are distributed, and the centers of the micropores in each annular microporous layer are concentric and the circle is concentric with the core layer; the core layer is made of quartz doped with alkali metal, and the core layer includes The inner core layer and the transition core layer; the relative refractive index difference Δn between the transition core layer and the fourth cladding layer 11 Where a is the transition coefficient of the transition core layer, and x is the distance from any point in the transition core layer to the edge of the inner core layer. The invention not only has the characteristics of ultra-low attenuation and large effective area, but also can realize large-mode-field optical fiber transmission and reduce nonlinear effects during large-capacity transmission.

Description

technical field [0001] The invention relates to the technical field of single-mode optical fibers, in particular to a single-mode optical fiber with ultra-low attenuation and large effective area. Background technique [0002] With the development of 4G to the 5G era, the Internet will develop into the Internet of Everything, from the interconnection of people to the interconnection of people and things, and the interconnection of things and things. The resulting data volume will be a qualitative leap. Optical fiber communication technology is the most representative information technology. As the core basic material of optical communication, optical fiber is an indispensable part of optical communication system. Its technical level is related to the development of transmission capacity of optical communication system. With the development of social informatization, traditional optical fiber technology has been difficult to meet the rapid development of information capacity....

AI Technical Summary

Problems solved by technology

[0006] Since the pure silica core layer has a higher melting point than the fluorine-doped cladding layer, stress will be generated at the core-clad interface during fusion molding, resulting in increased fiber attenuation

[0007] In addition, the design of ultra-low attenuation fiber with pure silica core and fluorine-doped cladding is difficult to achieve large-mode-field fiber transmission, so it is difficult to reduce the nonlinear effect during large-capacity transmission, which also restricts ultra-low attenuation fiber in large-capacity Application prospects in communication transmission technology

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