A method of manufacturing a polarization-maintaining optical fiber

Abstract

A method for manufacturing an elliptical-clad polarization-maintaining optical fiber. The technical scheme of the present invention is as follows: 1. MCVD process is used to manufacture a preformed rod with a stress layer; 2. Quartz slices with a certain thickness and width equal to the width of the preformed rod are assembled on both sides of the preformed rod, and then inserted into a correspondingly configured quartz sleeve ; 3. After the combined optical fiber preform is cleaned, it is drawn on an optical fiber drawing tower to make an elliptical-clad polarization-maintaining optical fiber. The cross-sectional structure of the elliptical-clad polarization-maintaining optical fiber is respectively an outer cladding (12), a stress action area (13), an inner cladding (14) and a core layer (15) from outside to inside, and is characterized in that: the stress action area (13 ) is elliptical in shape, and the ellipticity is above 2.5:1. The advantages of the present invention are: 1. The outer pieces are made of high-purity quartz, and the cost is relatively low, so the production cost of the polarization-maintaining optical fiber is reduced and the production efficiency is improved. 2. Reduce the problem of preform cracking in the production process. Because if there is a non-circularly symmetrical stress zone in the preform, the probability of the preform bursting will be greatly increased.

Description

technical field [0001] The invention relates to a method for manufacturing a polarization-maintaining optical fiber, in particular to a method for manufacturing an elliptical cladding type polarization-maintaining optical fiber. The application of the manufacturing method can improve the polarization performance of the elliptical cladding type polarization maintaining fiber, increase the production efficiency and reduce the cost. Background technique [0002] Polarization-maintaining fiber, also known as polarization-maintaining fiber, is a kind of special fiber, which is widely used in wavelength division multiplexing communication systems and fiber optic sensors. Especially in the field of fiber optic sensors, it is the core sensing component of military sensors such as optical integrated devices, polarization maintaining fiber couplers, and fiber optic gyroscopes. [0003] According to the different cross-sectional structures, there are four common types of polarization-...

AI Technical Summary

Problems solved by technology

One is the online one-step forming method, that is, the preform is formed at one time by depositing and collapsing on the MCVD lathe, and appropriately supplemented with etching. and its production method, the publication number is CN1632629A, which discloses a "one"-shaped polarization-maintaining optical fiber and its production method; the structure and manufacturing method of the Chinese patent elliptical jacket type (ie elliptical cladding type) optical fiber preform and polarization-maintaining optical fiber, The publication number is CN1410375A, which discloses the structure and manufacturing method of an elliptical jacket-type optical fiber preform and a polarization-maintaining optical fiber; the second is the cold processing method, that is, the structural symmetry with a stress zone is made by depositing and collapsing on the MCVD window Then cut off the appropriate quartz parts symmetrically 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 affect the strength of the optical fiber, and this method is time-consuming. Waste, cost High, 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, a structure with a stress zone is formed on the MCVD window through deposition and collapse Symmetrical preform, and then press the preform into an ellipse, and then put together appropriate quartz sheets on both sides for drawing. This method is difficult to operate and has a low yield. For example, the Chinese patented rod-type polarization-maintaining optical fiber, the patent number is 200820108679.6

Images