A bend-insensitive single-mode optical fiber with small outer diameter and low attenuation

Abstract

The invention relates to a bending-insensitive single mode with small outer diameter and low attenuation, which includes a core layer, a cladding layer and a resin coating layer, and is characterized in that the core layer diameter a is 6.5-6.8 μm, Δn1 is 0.30%-0.34%, Inner cladding diameter b is 17-23 μm, Δn2 is -0.1% to -0.05%, sunken cladding diameter c is 42-50 μm, Δn3 is -0.4% to -0.2%, outer cladding diameter d1 is 123-125 μm, outer cladding It is a pure silica glass layer, and the outer cladding is coated with a resin coating layer, including an inner coating layer and an outer coating layer. The diameter d2 of the inner coating layer is 150-160 μm, and the diameter d3 of the outer coating layer is 175-185 μm . The optical fiber can have low attenuation and good bending performance at the same time. The optimized design of the depressed cladding profile improves the macrobending performance of the optical fiber to ensure the low temperature performance of the optical fiber after being cabled under the premise of reducing the coating diameter.

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...

AI Technical Summary

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.

Images