Low-loss bend insensitive single mode fiber with pure silicon fiber core

Abstract

The invention discloses a low-loss bend insensitive single mode fiber with a pure silicon fiber core. The low-loss bend insensitive single mode fiber comprises the pure silicon dioxide fiber core, inner cladding doped with the low refractive index, air vent hole structures and outer pure silicon cladding. The fiber core is coated with the inner cladding. The air vent hole structures are symmetrically distributed outside the inner cladding in a regular hexagon. The outer cladding is arranged outside the air vent hole structures so that the fiber core, the inner cladding and the air vent hole structures can be coated. The pure silicon dioxide fiber core is adopted so that loss of the fiber core can be effectively reduced. The structure of the inner cladding with the low refractive index is adopted, so that the refractive index of the fiber core is higher than that of the inner cladding, low-loss transmission of light in the fiber core is limited, and the mode field area and appearance of a high-order mode are controlled. The structure that air vent holes are compounded with the outer cladding is adopted, so that the influence of bending on the fiber core is reduced, bending loss is reduced, and the excellent bend insensitive performance is obtained. Air vent holes are distributed in the regular hexagon so that prefabricated rods can be well stacked and controlled in the rod forming process and the accuracy of the structure is improved.

Description

Technical field [0001] The invention relates to a pure silicon core low-loss bend-insensitive optical fiber required for indoor or computer room environments in the fields of optical access network, optical fiber transmission network, data center and the like. Background technique [0002] In recent years, with the rapid development of long-distance transmission of optical communications in the backbone network, large-capacity transmission technologies such as 100G and even 400G have begun to mature. Ultra-large capacity optical transmission was developed under the stimulation of a large amount of data demand. The maturity of high-speed optical transmission technology has made optical fiber access and data centers show a faster development speed. Now, fiber-to-the-home (FTTH), fiber-to-the-building (FTTB) and even fiber-to-the-desk (FTTD) make short-distance connections of fiber begin to appear around our lives. At the same time, computer rooms represented by data centers have a...

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Problems solved by technology

In addition, in the above schemes, the core is doped with germanium with high refractive index, and its loss will be higher than that of pure silica core.

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