A high-stress active polarization-maintaining optical fiber preform drawing method

Abstract

The invention relates to a wire-drawing method of a high-stress active polarization-maintaining optical fiber prefabricated rod. Rare earth ion-doped active optical fiber preform is deposited by CVD process; a quartz rod and an optical fiber preform are prepared respectively; the active optical fiber preform is fused between the quartz rod and the optical fiber preform; Two holes; insert two thin quartz rods into the two inner holes II of the quartz rod and the two inner holes I of the active optical fiber preform respectively, respectively insert the two stress rods into the two inner holes of the lower connected optical fiber preform respectively In the inner hole III and the two inner holes I of the active optical fiber preform, the two stress rods are in close contact with the two thin quartz rods; the preform rods are connected to the support tube and put into the heating furnace of the drawing tower, and the preform rods After being heated and softened, since the upper ends of the two inner holes I of the active optical fiber preform have been sealed by thin quartz rods, boron rods can be prevented from overflowing the inner holes I after being liquefied. The utilization length of the active polarization-maintaining preform can be effectively increased, and at the same time, the deformation of the optical fiber can be greatly 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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