Composite glass fiber containing chalcogenide glass fiber core and preparation method thereof

Abstract

The invention discloses a composite glass fiber containing a chalcogenide glass fiber core and a preparation method thereof. The fiber core of the composite glass fiber is a coaxial dual core consisting of a first fiber core and a second fiber core. The first fiber core is a chalcogenide glass fiber core, and the second fiber core is a germanium-doped quartz glass fiber core having an annular cross section. The second fiber core surrounds the first fiber core to compose the coaxial dual core. The diameter of the first fiber core is the same with the inner diameter of the second fiber core. A pure quartz glass cladding is arranged outside the second fiber core. The end face of the first fiber core and the end face of the second fiber core do not coincide on at least one side of the composite glass fiber. Chalcogenide glass with high nonlinear refractive index is integrated into a common fiber to get the composite glass fiber with a coaxial dual core. The chalcogenide glass can be in butt fusion with the common fiber with low loss, and the nonlinear performance of the quartz glass fiber can be enhanced by making full use of the high nonlinear refractive index of the chalcogenide glass.

Description

technical field [0001] The invention belongs to the field of optical fiber technology, and more specifically relates to a highly nonlinear composite glass optical fiber containing a chalcogenide glass core and a preparation method thereof. Background technique [0002] Various nonlinear phenomena in optics have continued to attract the attention of researchers in recent years. With the development of nonlinear fiber optics, highly nonlinear fibers are used in supercontinuum generation, optical coherence tomography, high-precision sensing, medical imaging and Research on new nonlinear effects is playing an increasingly important role. High nonlinear fiber refers to the fiber whose nonlinear coefficient is several orders of magnitude larger than that of conventional fiber. The nonlinear coefficient γ of the fiber is determined by the following formula: [0003] [0004] Among them, n 2 is the nonlinear refractive index coefficient of the material, ω is the angular frequen...

AI Technical Summary

Problems solved by technology

A coaxial dual-core composite glass fiber is obtained by integrating a chalcogenide glass with a high nonlinear refractive index into an ordinary fiber. The first core is a chalcogenide glass core surrounded by a second core of germanium-doped silica glass. The optical fiber produced by this method can not only be fused with ordinary optical fiber with a small loss, but also can make full use of the advantages of the high nonlinear refractive index of chalcogenide glass to enhance the nonlinear performance of silica glass optical fiber, thus solving the existing problems Microstructured photonic crystal fibers with small cores have high splicing loss, high pump light leakage, and large nonlinear refractive index fibers cannot be spliced, and the technical problems of high insertion loss

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