Single crystal fiber with Bragg structure cladding and manufacturing method thereof

Abstract

The invention discloses a single crystal fiber with Bragg structure cladding and a manufacturing method thereof and in particular relates to a design of a cladding structure of a single crystal optical fiber, belonging to the field of specific fibers. The invention discloses a single crystal fiber with a phase step refraction index cladding and a manufacturing method thereof. The single crystal fiber comprises a single crystal fiber core (1) and a Bragg structure cladding which surrounds the single fiber core and is formed by radially and alternately distributing a material layer (2) and a material layer (3) of two different refraction indexes, wherein each material layer comprises 10 to 20 layers. The fiber manufacturing method is characterized in that the materials of two different refraction indexes are alternately deposited to form a structure the high-refraction-index layers and the low-refraction-index layers of which are distributed radially and alternately by using an MCVD (modified chemical vapor deposition) method. The alternately distributed structure is reduced through heating and stretching so as to wrap the single crystal core finally so that the Bragg structure cladding is formed. The single crystal fiber is provided with the phase step refraction index cladding, and has high light binding capacity and low consumption. By using the manufacturing method of singlecrystal fibers, phase step refraction index claddings can be manufactured for single fibers of different materials, and the application of the single crystal fibers of various different materials is expanded.

Description

technical field [0001] The invention belongs to the field of special optical fibers, in particular to the cladding structure design of single crystal optical fibers. Background technique [0002] At present, single crystal optical fiber is mainly grown by wire drawing of crystal material, which has the dual characteristics of crystal and fiber. Single crystal optical fiber has the characteristics of high strength and high temperature resistance, and can be used in a wide range of fields such as conduction, sensing, frequency doubling, and holographic data storage. Due to the high refractive index of the crystal, it is difficult to make a single crystal fiber into a core-cladding structure, and the existing single crystal fiber is usually a cladding-free structure. The single crystal optical fiber with no cladding structure has a large transmission loss, its characteristics are easily affected by environmental changes, and the integrity of the optical fiber surface is also e...

AI Technical Summary

Problems solved by technology

This method is only applicable to lithium niobate (LiNbO 3 ) crystal growth of single crystal fiber is not suitable for other crystal materials, which limits the range of cladding applications

In addition, the controllability of this method is poor, the degree of diffusion is uneven, the depth of diffusion is not suitable for control, and the stability of product performance is poor.

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