Hollow-core composite glass optical fiber and preparation method thereof

Abstract

The invention discloses a hollow-core composite glass optical fiber and a preparation method thereof. The cladding of the hollow-core composite glass optical fiber is phosphate glass. The fiber core is composed of a thin high-refractive-index sulfur-based semiconductor layer and a central air hole. The optical fiber consists sequentially from the outer layer to the inner layer of the phosphate glass cladding, the sulfur-based semiconductor layer and the air hole. The hollow-core composite glass optical fiber of the invention has the characteristics of being high in infrared transmittance, large in non-linear coefficient, large in photoconductivity, capable of producing a mid-infrared supercontinuum, and low in loss in the mid- and far-infrared, and stably supports vortex optical transmission. The preparation method of the invention fully utilizes the wettability of the phosphate glass and the sulfur-based semiconductor fiber core material, and obtains the hollow-core composite glass optical fiber by hot-melting the sulfur-based semiconductor core material in the non-through hole in the phosphate glass under high temperature conditions to spontaneously form a ring-shaped fiber coreand, then, using a simple traditional drawing method.

Description

technical field [0001] The invention belongs to the technical field of composite material optical fibers, and in particular relates to a hollow-core composite glass optical fiber supporting vortex light transmission and a preparation method thereof. Background technique [0002] Since 1980, optical fibers have been favored in the fields of lasers, nonlinear optics, biomedicine, and sensing. In recent years, with the rapid development of optical fiber technology, people's demand for special optical fibers with special functions is increasing. Such as: orbital angular momentum transmission fiber for high purity and low crosstalk, mid-to-far infrared fiber for high power, high nonlinear fiber for all-optical signal processing, and high photoelectric characteristic fiber for photoelectric detection. Generally, there are three ways to obtain these high-performance and multi-functional special optical fibers. One is component composite optical fiber, which integrates functional m...

AI Technical Summary

Problems solved by technology

Among them, the high-pressure chemical vapor deposition method has been proved to be a powerful preparation technology for microstructured optical fibers, especially in the production of semiconductor optical fibers. The inner wall of the tube until the entire space is filled. By controlling the deposition conditions or post-processing, the crystal state of the fiber core can also be controlled accordingly, but the preparation length is limited, and the requirements for equipment are relatively high; pressure-assisted fusion The melt filling method is to prepare the microstructure optical fiber first, and then use high temperature and high pressure to selectively extrude the molten material into the capillary to make a composite microstructure optical fiber. The process is complicated and the requirements for equipment are also high; The extrusion method is to design the mold of the preform first, then pour the molten glass liquid into the mold, and then prepare the preform by extrusion, and draw it into an optical fiber by hot drawing technology. This method is more complicated to design the mold

The composite microstructured optical fiber prepared by these production methods is complex in process and requires high equipment requirements.

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