Small-outer-diameter low-attenuation bending insensitive single-mode optical fiber

Abstract

The invention relates to a small-outer-diameter low-attenuation bending insensitive single mode, which comprises a core layer, cladding layers and a resin coating layer, and is characterized in that the diameter a of the core layer is 6.5-6.8 microns, the delta n1 is 0.30%-0.34%, the diameter b of the inner cladding layer is 17-23 microns, the delta n2 is-0.1%--0.05%, the diameter c of the sunken cladding layer is 42-50 microns, the delta n3 is-0.4%--0.2%, the diameter d1 of the outer cladding layer is 123-125 microns, and the outer cladding layer is a pure silicon dioxide glass layer. the outer cladding layer is coated with a resin coating layer and comprises an inner coating layer and an outer coating layer, the diameter d2 of the inner coating layer is 150-160 microns, and the diameter d3 of the outer coating layer is 175-185 microns. The optical fiber can have low attenuation and good bending performance at the same time, the profile design of the sunken cladding is optimized, the macro-bending performance of the optical fiber is improved, and the low-temperature performance of the optical fiber after cabling can be effectively guaranteed on the premise that the coating diameter is reduced.

Description

technical field [0001] The invention relates to a bending-insensitive optical fiber with small outer diameter and low attenuation. The optical fiber has good bending performance and low attenuation coefficient, and belongs to the technical field of optical communication transmission. Background technique [0002] As the scale of optical fiber laying continues to increase, fiber channel resources in the same area are increasingly tight. Using limited space to lay more optical fibers is an ideal solution. Reducing the diameter of optical fibers has become one of the solutions. ; At the same time, the laying and configuration of FTTx optical fiber lines put forward higher requirements for the bending performance and attenuation coefficient of the optical fiber; thus, it is necessary to develop a small outer diameter bend-insensitive optical fiber with a low attenuation coefficient. [0003] In order to meet the bending performance requirements of G.657.A2, a common method is to...

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Problems solved by technology

[0006] Patent document WO2014 / 172143A discloses a small outer diameter optical fiber, the in-situ modulus of the inner coating is less than 0.50 MPa, the in-situ modulus of the outer coating is more than 1500 MPa, and the difference between the inner and outer moduli is too large. The large difference in thermal expansion coefficient between the two materials will cause coating delamination and increase in fiber attenuation under low temperature conditions.

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