Single-mode double-cladding dysprosium-doped chalcogenide glass optical fiber and preparation method thereof

Abstract

The invention provides a single-mode double-cladding dysprosium-doped chalcogenide glass optical fiber and a preparation method thereof. The single-mode double-cladding dysprosium-doped chalcogenide glass optical fiber is composed of an outer cladding, an inner cladding and a fiber core. An outer cladding tube and an inner cladding tube are prepared by adopting a high-speed tube rotating method, acore rod is prepared by adopting a melt quenching method, the single-mode double-cladding dysprosium-doped chalcogenide glass optical fiber with small core cladding eccentricity, tight interface adherence, smooth surface and good roundness is prepared by combining with a repeated rod-in-tube method, intermediate infrared optical fiber fluorescence spectra with wavelengths of 2957 and 4258 nm respectively are obtained in later tests, and the optical fiber provided by the invention can be expected to be an ideal intermediate infrared active optical fiber material. The optical fiber preparationmethod solves the problems that the core cladding is prone to be eccentric, the size of the core cladding is not easy to be control quantitatively and the core cladding junction surface is not tightlyattached in the preparation of the existing chalcogenide glass optical fiber.

Description

technical field [0001] The invention relates to the field of optical fiber preparation, in particular to a single-mode double-clad chalcogenide glass optical fiber and a preparation method thereof. Background technique [0002] Compared with oxide and fluoride glasses, chalcogenide matrix glasses have lower maximum phonon energy (300-450cm -1 ), and the low phonon energy is beneficial to reduce the multiphonon relaxation rate of rare earth ions in the process of mid-infrared luminescence transition, which promotes the generation of mid-infrared luminescence. So far, chalcogenide glass optical fiber is the only substrate whose fluorescence emission above 4 μm is observed at room temperature. Therefore, rare earth ion-doped chalcogenide glass fiber is considered to be the most potential matrix material for mid-infrared fiber lasers and amplifiers, and dysprosium-doped chalcogenide glass fiber has an important application prospect in the field of 4-micron fiber lasers. [000...

AI Technical Summary

Problems solved by technology

A single-mode chalcogenide fiber with good performance can be prepared by the double crucible method, but it is generally limited to the preparation of binary system chalcogenide glasses, such as As 2 S 3 、As 2 Se 3 Wait

As for the rod-tube method, the casing is generally obtained by the drilling method at present, and the casing obtained by this method is difficult to be polished, making its surface smoothness poor, which will greatly increase the transmission loss of the optical fiber, and then limit the optical fiber. Applications

In addition, there are still many technical difficulties in the preparation of rare earth-doped single-mode double-clad optical fibers: such as the core-clad is easy to eccentric, the core-clad size ratio is not easy to be quantitatively controlled, and the core-clad bonding surface is not tightly bonded, etc.

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