Small-diameter optical fiber and preparation method thereof

Abstract

The invention provides a small-diameter optical fiber. The small-diameter optical fiber comprises a bare optical fiber; a coating layer coated on the outer layer of the bare optical fiber. The bare optical fiber includes: a core layer; an optical cladding, coated on the surface of the core layer; a concave layer coated on the surface of the optical cladding; an outer coating layer coated on the surface of the sunken layer. The relative refractive index difference of the optical cladding gradually changes from inside to outside, and the gradual change range is +0.05% to -0.10%. By designing thesection structure of the preform, the optical cladding in the section of the preform is designed in a gradual change manner, so that the MFD value of the optical fiber is improved and is close to orequal to that of a standard optical fiber. Furthermore, due to the design of the concave layer gradient structure, the cut-off wavelength of the optical fiber can be controlled while the macro-bendingrequirement of the optical fiber is met, and the optical fiber transmission requirement is met. The invention also provides a preparation method of the small-diameter optical fiber.

Description

technical field [0001] The invention relates to the field of optical fiber technology, in particular to a thin-diameter optical fiber and a preparation method thereof. Background technique [0002] With the development of the communication field in the future, the optical fiber network will carry the application of technologies such as information network, wide-area measurement, high-speed sensing, high-performance computing, and intelligent control, which will inevitably be accompanied by a sharp increase in transmission capacity. Because of this, the amount of duct laying is obviously insufficient, and the deployment of new optical fibers requires a lot of reinvestment costs. Therefore, in order to make full use of existing pipeline resources and reduce construction costs, laying more optical fibers in existing pipelines has become a preferred pipeline resource solution. [0003] The diameter of the optical fiber is reduced, but it is required to have the same optical per...

AI Technical Summary

Problems solved by technology

This design reduces the coating thickness, but the cost of new coating materials used is expensive, and the corresponding coating curing has a series of difficulties

The prior art also proposes an optical fiber with a reduced diameter. The mode field diameter (MFD) of this type of optical fiber is greatly reduced, and it is easy to generate a large connection loss after fusion splicing with a standard optical fiber.

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