Seven-core small-diameter single mode fiber and manufacturing method thereof

Abstract

The invention relates to a seven-core small-diameter single mode fiber. The seven-core small-diameter single mode fiber comprises seven single-mode fibers having the same core cladding structure, wherein the seven fibers combined together closely, one fiber located at the center of the fibers, and the other six fibers surround the periphery of the center fiber; the single-mode fiber comprises a core layer and a cladding layer, the cladding layer comprises an inner cladding layer, a sunken cladding layer and an external cladding layer from the inside to the outside, radius r4 of the external cladding layer is 20-25 microns, ratio r4/r1 of the radius of the external cladding layer to the radius of the core layer is 5.1-5.5, ratio r4/r2 of the radius of the external cladding layer to the radius of the inner cladding layer is 2.4-2.8, and ratio r4/r3 of the radius of the external cladding layer to the radius of the sunken cladding layer is 1.6-2.0. With the fiber provided by the invention,external diameter of the multi-core fiber is reduced greatly, and communication capacity density of unit cross section of the fiber is improved remarkably; consequently, space resource for paving pipelines is reduced; meanwhile, signal crosstalk influence among different fiber units is eliminated. The fiber provided by the invention has excellent comprehensive performance parameters, such as wavelength, mode field, attenuation and chromatic dispersion, in application wavebands, has microbending loss which is small enough. The fiber provided by the invention can be produced through a simple and convenient manufacturing method and needs low manufacturing cost.

Description

technical field [0001] The invention relates to a seven-core small-diameter single-mode optical fiber and a manufacturing method thereof, belonging to the technical field of optical communication. Background technique [0002] In the field of optical communication, the capacity of voice, digital and video communication is increasing year by year. In order to meet the needs of high-capacity communication, a current solution is usually to increase the laying density of regular-sized optical fibers, which not only increases the laying space resources. Requirements, but also increase the cost of optical connections between optical fibers, especially in FTTx applications, urban pipeline resources are very scarce. Under the same laying space resources, increasing the transmission capacity of a single optical fiber is a very important solution. In a known method, in order to avoid increasing the laying quantity of a single optical fiber, with a size of 250 microns of a conventiona...

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Problems solved by technology

However, in this scheme, it is more difficult to form holes on the cladding mother bar, and the arrangement accuracy is difficult to control, and large-scale production is a problem

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