Manufacture method of elliptical stressed zone type polarization maintaining fiber

Abstract

The invention discloses a manufacture method of elliptical stressed zone type polarization maintaining fiber, which comprises the following steps: producing a prefabricated rod to be processed with a stressed zone using MCVD technology; fixing the prefabricated rod to be processed on a grinding machine, grinding the external diameter to an appropriate dimension, and obtaining a core rod of the fiber prefabricated rod; drilling three apertures on the transverse plane of a quartz rod, obtaining a quartz coating member; inserting the core rod into a central aperture of the quartz coating member, obtaining a formal fiber prefabricated rod; fixing the fiber prefabricated rod on an optical fiber drawing tower and drawing into an elliptical stressed zone type polarization maintaining fiber. The cross section structure of the elliptical stressed zone type polarization maintaining fiber comprises from outside to inside in order: an outer cladding (1), a stressed zone (2), an inner cladding (3) and a core layer (4), which is characterized in that the stressed zone (2) is in elliptical shape, and the ovality is above 2.5:1. The invention has the advantages that the outer coating member is made of high purity quartz with low cost, and the production cost is reduced; the process flow is simple, and the repeatability is high, and the circular hole interior surface has a high fineness and good symmetry, and method improves the processing efficiency, and the optical performance and reliability of the polarization maintaining fiber are substantially improved.

Description

technical field [0001] The invention relates to the technical field of manufacturing an elliptical stress zone type polarization maintaining optical fiber, in particular to an ultra-fine polarization maintaining optical fiber, the outer diameter of which is only 40 μm. Background technique [0002] Polarization-maintaining fiber has a strong polarization-maintaining ability for linearly polarized light, and is mainly used in polarized light interferometric angle rotation measurement. Its typical applications are in the manufacture of fiber optic gyroscopes, fiber optic hydrophones, and coherent optical communication systems. With the in-depth research on fiber optic gyroscopes at home and abroad, miniaturization is an important development direction of fiber optic gyroscopes. The primary problem of the miniaturization of the gyroscope is to reduce the volume of the optical fiber loop. In the case of the same length of the optical fiber loop, the volume of the optical fiber l...

AI Technical Summary

Problems solved by technology

One is the online one-step forming method, that is, through deposition and collapse on the MCVD lathe, and then appropriately assisted by etching to form a preform at a time, and then pull it into a polarization-maintaining optical fiber. The process is relatively simple, but the process is complicated , such as the Chinese patent "one"-shaped polarization-maintaining optical fiber and its production method, the publication number is CN1632629A, which discloses the "one"-shaped polarization-maintaining optical fiber and its production method; The structure and manufacturing method of preform and polarization-maintaining optical fiber, the publication number is CN1410375A, discloses the structure and manufacturing method of elliptical jacket type optical fiber preform and polarization-maintaining optical fiber; and collapse to make a structurally symmetrical preform with a stress zone, and then symmetrically cut off appropriate quartz parts on both sides of the preform, and then draw it into an optical fiber on a wire drawing tower. This method requires cold processing. If it is not handled properly, it will be Affect the fiber strength, and this method is time-consuming, waste material, and high cost, such as the US patent Polarization Controlling Optical Fiber Preform and Fabrication Methods, the patent number is US 2006 / 0191295A1; the third is the compression-piece method, that is, on the MCVD car window Through deposition and collapse, a structurally symmetrical preform with a stress zone is made, and then the preform is pressed into an elliptical shape, and then a suitable quartz sheet is assembled on both sides for wire drawing. This method is difficult to operate and has a low yield, such as Chinese patent rod type polarization maintaining fiber, the patent number is 200820108679.6

Images