Optical fiber preform and manufacturing method of optical fiber

Abstract

The invention relates to an optical fiber preform and a manufacturing method of an optical fiber, in particular to a manufacturing method of the optical fiber preform with a large core diameter and acorresponding low loss optical fiber, the method solves the problem of the optical fiber preform with a small core diameter prepared in the prior art. The manufacturing method of the optical fiber preform includes, adopting an improved chemical vapor deposition (MCVD) combined with a rare earth ion gas phase doping method; depositing all materials under a gas phase condition; and then obtaining the optical fiber preform with a large core diameter through sintering and tube shrinkage processes, wherein components of the manufactured optical fiber preform core are SiO2, Al2O3, Yb2O3, Ce2O3 and F, the diameter of the preform core > 3 mm. The manufacturing method of the optical fiber includes, selecting an appropriate sleeve process to sleeve the manufactured optical fiber preform to enable the core-to-package ratio to meet the requirements of the optical fiber; processing the sleeved preform into an octagonal structure; and performing wire drawing at a temperature of 2050 + / -20 DEG C to draw into the optical fiber.

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...

AI Technical Summary

Problems solved by technology

[0005] Aiming at the technical problems of small core diameter of the optical fiber preform prepared by the existing method, 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 and using the method The prepared optical fiber preform is prepared by the method of preparing optical fiber, which adopts the improved chemical vapor deposition (MCVD) combined with the rare earth ion gas phase doping method. The core diameter of the prepared preform is larger than 3mm, the refractive index distribution is relatively uniform, and the preparation process is simple. Yield per preform

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