Manufacturing method of porous optical fiber preform

Abstract

The invention discloses a manufacturing method of a porous optical fiber preform, and relates to the field of new material. The method includes the steps of: preparing a mandril by using a conventional communication optical fiber preparation method, wherein the mandril contains a germanium doped quartz core layer and a pure silica quartz cladding arranged on periphery of the core layer, and the germanium doped quartz core layer and the pure silica quartz cladding are concentric circles; opening a certain number of arc slots on angles of the mandril outer edge, according to design requirements of a porous bending insensitive optical fiber, immersing the mandrel with arc slots with acid solution to remove impurities, washing by deionized water and drying; sleeving a quartz casing on the mandrel with arc slots; inserting capillaries into the arc slots to form the desired pore, thereby preparing the porous optical fiber preform. The method of the invention can realize precise positioning of micropores in the manufacturing process of porous optical fiber, improve polarization mode property and bending loss property of the porous optical fiber, reduce impurity pollution in the processing process of the porous optical fiber preform and improve attenuation property of the porous optical fiber.

Description

technical field [0001] The invention relates to the field of new materials, in particular to a method for manufacturing a porous optical fiber preformed rod. Background technique [0002] In recent years, with the rapid development of fiber-to-the-home, how to solve the problem of fiber access in the last 100 meters has become the target of people's attention. In the small bending environment of conventional optical fibers, the bending loss of the optical fiber increases sharply. This is one of the key factors restricting the application of optical fiber in the last 100 meters. Conventional communication optical fiber cannot realize the information transmission of optical signals with small bending loss under the existing high-speed optical fiber communication system; conventional G.657 optical fiber has a large loss in the extremely small bending diameter (below 5mm), and cannot be bent arbitrarily. Applications in end-user environments are limited, therefore, there is an...

AI Technical Summary

Problems solved by technology

In the conventional manufacturing process of micro-hole optical fiber, the method of capillary bunching and other methods is easy to introduce new impurities, causing capillary pollution, so that the optical fiber preform is polluted inside before it is drawn into an optical fiber, so that the formed The optical fiber preform itself is polluted by various impurities that affect the attenuation of the optical fiber

When the optical fiber preform prepared in this way is used to draw the optical fiber, the transmission loss of the obtained optical fiber will be greatly increased compared with the conventional communication optical fiber, so it is difficult to be applied in the actual communication system

[0004] If the microholes distributed around the core rod are unevenly distributed, it will cause light leakage on the one hand, which will deteriorate the bending loss characteristics of the drawn optical fiber, and on the other hand, will cause the optical fiber to lie on the plane of the original fiber core diameter. There is asymmetry in the circumferential force of the fiber, which causes poor polarization mode characteristics of the fiber, which affects the normal use of the fiber

Due to the fact that the process of capillary stacking and bunching cannot be precisely controlled, the capillary will be squeezed against each other during the drawing process, resulting in deformation of the micropores, so that the accuracy of the final drawn micropores cannot be guaranteed.

These problems will not only increase the attenuation of the fiber, but also cause the abnormality of the polarization mode dispersion of the fiber, and even lead to a sharp decline in the mechanical properties of the fiber, affecting the normal service life of the fiber.

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