Bent insensitive single-mode fiber with air cladding layer

Abstract

The invention relates to a bent insensitive single-mode fiber with an air cladding layer, and a waveguiding structure of the bent insensitive single-mode fiber comprises a core layer and a cladding layer which is provided with three subsidiary cladding layers, namely a first cladding layer, a second cladding layer and a third cladding layer, wherein the first cladding layer and the third claddinglayer are pure silicon dioxide glass layers, the second cladding layer is air, and the relative refractive index differences of the core layer and the three cladding layers are relative to the third cladding layer. The parameters of the waveguiding structure are as follows: the relative refractive index difference delta 1 of the core layer is greater than or equal to 0.30% and less than or equal to 0.85%, and the radius r of the core layer is greater than or equal to 3.5 micrometers and less than or equal to 5.0 micrometers; the relative refractive index difference delta 2 of the second cladding layer is greater than or equal to -55.00% and less than or equal to -45.00%, and the radius r2 of the second cladding layer is greater than or equal to 8.0 micrometers and less than or equal to 15.0 micrometers; and the refractive index of each of the first cladding layer and the third cladding layer is a refractive index nc of the pure silicon dioxide glass, the radius r1 of the first cladding layer is greater than or equal to 6.0 micrometers and less than or equal to 12.5 micrometers, and the radius r3 of the third cladding layer is greater than or equal to 62.0 micrometers and less thanor equal to 63.0 micrometers. The cutoff wavelength of the bent insensitive single-mode fiber is less than or equal to 1310 nm; and under the condition of bending the fiber for one circle with the diameter of 10 mm, the typical bending supplementary loss is less than 0.03 dB.

Description

technical field [0001] The invention relates to an optical fiber for access network and fiber-to-the-home (FTTH), especially a bending-insensitive single-mode optical fiber with an air cladding that has excellent bending performance and is suitable for being stored in a junction box or a closed container. Background technique [0002] At present, the bending radius of the G.652 standard optical fiber widely used in China is 25mm. Due to the limitation of the bending radius, the optical fiber cannot be bent and installed at a small angle at will. [0003] As FTTH begins to penetrate into residential users, the amount of optical fiber access network construction has increased significantly, and access network construction requires easier networking work and shorter time. This requires that the single-mode optical fiber suitable for the access network has the characteristics of small additional loss and high mechanical strength under a small bending radius, which is convenient ...

AI Technical Summary

Problems solved by technology

This type of optical fiber has good bending insensitivity, but due to its relatively complex stru

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