A processing method of rare earth ion doped optical fiber preform

Abstract

The invention relates to a processing method of a rare earth ion doped optical fiber perform. The method comprises steps as follows: a preform containing a rare earth ion doped core layer is deposited with the MCVD (modified chemical vapor deposition) technology; the preform is cut off in a preset position, sizes and positions of two holes are designed reasonably, and multiple small holes are designed in the two holes; a large drill is determined according to the diameter of the holes and a small drill is determined according to the diameter of the small holes; drilling: holes are drilled in the positions of the small holes with the small drill firstly, positions of the multiple small holes are required to overlap with the contact surface of the large drill and the preform, and after the multiple small holes are drilled, the large drill is used for drilling holes in the position of the large drill; after drilling, inner walls of the holes are polished until the inner holes reach designed sizes. The processing method has the advantages as follows: the stress area of the rare earth ion doped optical fiber preform in the ultrasonic drilling process can be effectively decreased with a repeated drilling method, and damage caused by mechanical external force to the optical fiber preform can be further weakened; the processing accuracy of the rare earth ion doped optical fiber perform can be further improved.

Description

technical field [0001] The invention relates to a processing method of a rare earth ion-doped optical fiber preform, which belongs to the technical field of optical fiber manufacturing. Background technique [0002] In 1985, researchers at the University of Southampton in the United Kingdom successfully developed a rare earth-doped optical fiber by using a modified chemical vapor deposition process (Modified Chemical Vapor Deposition, MCVD). 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 ...

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Problems solved by technology

[0004] The purpose of the present invention is to provide a kind of processing method of rare earth ion doped optical fiber preform aiming at the deficiency of existing rare earth ion doped polarization maintaining optical fiber preform processing method, this method reduces the The maximum mechanical force on the preform during the drilling process, thereby reducing the damage of the optical fiber preform and improving the processing accuracy of the preform

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