Method for producing fiber prefabricated rod

Abstract

A method for producing a fiber prefabricated rod comprises the following steps of: (1) preparing a fiber core rod by the vapor axial deposition VAD technology; (2) preparing a fluorine-doped bogging cladding by the plasma chemical vapor deposition PCVD technology, followed by melting the fluorine-doped bogging cladding with the fiber core rod prepared in Step (1) to produce a fiber core rod prefabricated component; (3) preparing an outer cladding of the fiber core rod prefabricated component by the outer vapor deposition OVD technology, followed by sintering to finally obtain the transparent fiber prefabricated rod. The fiber core rod includes a cladding with the ratio of the cladding diameter to the core diameter being within the range from 3.2 to 4.6; the diameter ratio of the initial position of the fluorine-doped bogging cladding to the core ranges from 3.2 to 4.6; and the ratio of the fluorine-doped bogging cladding width to the core diameter ranges from 0.24 to 0.49. By the adoption of the method provided by the invention, the key technology for the high-efficient large scale production of single-mode fibers is solved, the manufacture efficiency of the curly insensitive single-mode fiber prefabricated rod is greatly raised, and the production cost is reduced.

Description

technical field [0001] The invention relates to the field of optical fiber communication, in particular to a method for manufacturing an optical fiber preform using three processes. Background technique [0002] In contemporary communication networks, client-oriented access technology has always been a difficulty that limits the rapid development of high-bandwidth services. This is the so-called last mile problem in communication networks. After massive information reaches the access network via transmission equipment, Must be broken down into a trickle of streams to be interconnected with end users. For the optical fiber communication network that has accounted for more than 80% of the global information flow, the optical fiber access technology is a natural means to solve this problem. Using the massive bandwidth of optical fiber, through a series of technical means, the "fiber opticization" of the entire information network will be realized, which will fully support the ...

AI Technical Summary

Problems solved by technology

[0024] In summary, in the process of manufacturing this bend-insensitive curved single-mode optical fiber preform, the conventional process has the following defects: the conventional VAD (axial vapor deposition) process, OVD (outside vapor deposition) process and APVD ( Plasma-enhanced vapor deposition) process, when manufacturing optical fiber preforms, during the deposition process, the deposition efficiency of quartz glass doped with fluorine is very low, the doping concentration of fluorine is between 2% and 2.5%, and the fluorine-doped quartz The relative refractive index difference between the glass composite material and the pure quartz glass material at the wavelength of 633nm is within 0%~-0.35%

This low refractive index depressed fiber waveguide cannot provide better photoelectric magnetic field confinement ability, and the bending resistance of the fiber is poor; at the same time, the low fluorine deposition efficiency not only causes waste of fiber raw materials, but also improves The manufacturing cost of optical fiber preform makes the performance of optical fiber not guaranteed

Using the PCVD (Plasma Chemical Vapor Deposition) process, fluorine doping has a high deposition efficiency, but the deposition rate of the optical fiber core rod manufactured by the PCVD process is too low, and the current maximum rate is between 2.5g / min and 4.5g / min, and The PCVD process belongs to the in-tube deposition process. The size of the deposited fiber core rod is limited by the cavity. The diameter of the fiber core rod is small, the production efficiency is low, the manufacturing cost is high, and it does not have the competitiveness of large-scale production.

[0025] Moreover, the use of one or two technologies in the original process cannot solve the problem of "the high bending performance of the optical fiber and the high-speed deposition of the optical rod cannot be taken into account at the same time", and the manufactured single-mode optical fiber is no longer suitable for intelligence and function. The development needs of the next generation optical fiber communication network technology

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