Preparation method of doped polarization-maintaining optical fiber

Abstract

The invention discloses a preparation method of a doped polarization-maintaining optical fiber. The method includes the following specific steps of adding nanopore silicon dioxide powder to a rare earth and co-doped ion inorganic salt solution to form a suspension, centrifugally separating solid particles and liquid at high speed, conducting drying, dewatering and granulating to form ion adsorption silicon dioxide particles, conducting isostatic compaction and the like to obtain a cylindrical rare earth doped silicon oxide core bar, conducting drilling, grinding and polishing, and establishing a uniform porous silicon dioxide thin film layer on the inner wall of a core bar tube through a nanometer assembling technology. Silicon dioxide nanometer particles and doping ions are mixed in a solution, the uniformity of the doping ions in the radial direction and the axial direction of the core bar is quite high, the fiber core refraction rate profile has high flatness, the fiber core numerical value aperture precision can be adjusted, the optical fiber has high laser slope efficiency, the stress area of the rare earth ion doped optical fiber prefabricated bar in the ultrasonic drilling process can be effectively reduced by means of a multi-drilling method, and machining precision is high.

Description

technical field [0001] The invention relates to the technical field of optical fiber manufacturing, in particular to a method for preparing a doped polarization-maintaining optical fiber. Background technique [0002] In 1985, researchers at the University of Southampton in the United Kingdom successfully developed rare earth-doped optical fibers using an improved chemical vapor deposition process. In the past 30 years, researchers have continuously improved and innovated the preparation process of rare earth-doped optical fibers, which has led to the continuous and rapid development of rare earth-doped optical fiber amplifiers and lasers. Lasers and their application technology are an important cutting-edge technology in the field of optoelectronics related to national defense and people's livelihood. Compared with other types of lasers such as semiconductor lasers and gas lasers, fiber lasers with rare earth-doped fibers as gain media have high beam quality and high effici...

AI Technical Summary

Problems solved by technology

However, due to the limitations of the active polarization-maintaining fiber processing technology, no domestic unit has developed an erbium-ytterbium co-doped polarization-maintaining fiber that can meet practical requirements.