Preparation method of large core diameter optical fiber preform rod and optical fiber

Abstract

The invention relates to methods for preparing optical fiber preforms and optical fibers, in particular to methods for preparing optical fiber preforms with large core diameters and corresponding low-loss optical fibers. By the aid of the methods, the problem of small core diameters of optical fiber preforms prepared in the prior art can be solved. The method for preparing the optical fiber preforms with the large core diameters includes depositing all materials under vapor-phase conditions by the aid of modified chemical vapor deposition (MCVD) and rare earth ion vapor-phase doping processes;carrying out sintering and tube shrinking technologies to obtain the optical fiber preforms with the large core diameters. The prepared optical fiber preforms comprise SiO2, Al2O3, P2O5, Yb2O3 and F,and the diameters of cores of the prepared optical fiber preforms are larger than 3 mm. The method for preparing the optical fibers includes sleeving the prepared optical fiber preforms with the large core diameters by the aid of selected appropriate sleeving technologies to allow the requirements of the optical fibers to be met by the core-cladding ratios of the optical fiber preforms; processing sleeved preforms to allow the preforms to obtain octagonal structures; drawing wires at the temperatures of 2050+ / -20 DEG C to obtain the optical fibers by means of drawing.

Description

technical field [0001] The invention relates to a method for preparing an optical fiber preform and an optical fiber, in particular to a method for preparing a large core-diameter optical fiber preform and a corresponding low-loss optical fiber. Background technique [0002] Fiber lasers are called the third-generation lasers. Compared with traditional lasers, fiber lasers have many advantages, such as high electro-optical conversion efficiency, good beam quality, long service life, strong environmental adaptability, and small footprint. They are energy-saving and environmentally friendly. Optoelectronic devices have been widely used in industrial manufacturing, medical treatment, energy exploration, military defense and other fields, and the growth rate of their market sales has reached double digits for several consecutive years. [0003] As the core device of high-power fiber lasers, laser fiber materials are the key factors that determine the power of fiber lasers, and e...

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Problems solved by technology

[0005] Aiming at the technical problems that the optical fiber preform prepared by the existing method has a small core diameter, uneven distribution of the core refractive index in the optical fiber preform, and large background loss of the optical fiber, the present invention provides a method for preparing an optical fiber preform with a large core diameter The method and the method for preparing an optical fiber using the large-core-diameter optical fiber preform prepared by the method, the core diameter of the prepared preform is > 3 mm, which greatly improves the optical fiber yield of a single preform, and the prepared optical fiber preform The axial refractive index and radial refractive index of the core are relatively uniform, and the numerical aperture is 0.06±0.005

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