Wire drawing method of high-stress active polarization-maintaining fiber prefabricated rod

Abstract

The invention relates to a wire drawing method of a high-stress active polarization-maintaining fiber prefabricated rod. The method comprises the following steps: depositing a rare-earth ion-doped active fiber prefabricated rod by virtue of a CVD process; respectively preparing a quartz rod and a fiber prefabricated rod; welding the active fiber prefabricated rod between the quartz rod and the fiber prefabricated rod; forming two holes in the entire welded prefabricated rod; respectively inserting two fine quartz rods into two inner holes II of the quartz rod and two inner holes I of the active fiber prefabricated rod, and enabling the two stress rods to tightly contact the two fine quartz rods; connecting a supporting pipe to the prefabricated rod, then placing the prefabricated rod into a heating furnace of a wire drawing tower, after the prefabricated rod is heated and softened, and sealing the upper ends of the two inner holes I of the active fiber prefabricated rod by virtue of the fine quartz rods, so that liquefied boron rod can be prevented from overflowing from the inner holes I. By adopting the wire drawing method, the using length of the active polarization-maintaining prefabricated rod can be effectively increased, and the deformation amount of an optical fiber can be maximally reduced.

Description

technical field [0001] The invention relates to a high-stress active polarization-maintaining optical fiber prefabricated rod drawing method, which belongs to the technical field of optical fiber manufacturing. Background technique [0002] Active optical fibers refer to optical fibers that can generate laser light or have optical amplification functions, and are mainly used in fiber lasers and fiber amplifiers. At present, the active characteristics of optical fibers are mainly obtained by doping rare earth ions in the core of optical fibers. Since the advent of rare earth-doped active optical fibers in the 1980s, it has driven the rapid development of fiber lasers and amplifiers to a large extent. Compared with lasers such as semiconductor lasers and chemical lasers, fiber lasers using active fibers as gain media have the advantages of high efficiency, high beam quality and low threshold. In order to meet the needs of some special performance fiber amplifiers and lasers,...

AI Technical Summary

Problems solved by technology

However, unlike conventional polarization-maintaining fibers, the active polarization-maintaining fiber core contains a certain amount of rare earth oxides and aluminum oxide, which can greatly increase the thermal expansion coefficient of the core region, which is different from conventional Compared with polarization-maintaining fiber, the core of active polarization-maintaining fiber is more easily deformed during the drawing process, which leads to increased fiber transmission loss and poor laser beam quality

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