Improved chemical vapor-phase deposition method by uisng graphite heating furnace as hot source

Abstract

The present invention is characterized by that it uses graphitc heating furnace us heaitng source and adopts improved chemical vapor deposition process to prepare optical fiber preform. Said invented produce incldues the following steps: A. using raw materials to produce deposition reaction to obtain deposit lining tube; and B. melt-condensing the deposit lining tube into solid core rod. Said invention can improve performance of otpical fiber preform, and improve performance of optical fiber, and can raise deposition rate and can save cost of equipment and operation. The invention avoids hidden safe trouble since hydrogen used in traditional technique.

Description

technical field [0001] The invention relates to a method for manufacturing an optical fiber prefabricated rod, in particular to a method for manufacturing an optical fiber prefabricated rod by an improved chemical vapor deposition method using a graphite heating furnace as a heat source. Background technique [0002] At present, the process method used to manufacture commercial silica optical fiber is mainly chemical vapor deposition method, which is divided into in-tube method and out-of-tube method. For the out-of-tube method, the main process methods are two kinds of out-of-tube vapor deposition method and axial phase vapor phase deposition method, while the in-tube method mainly includes two kinds of plasma chemical vapor deposition method and improved chemical vapor phase deposition method. The improved chemical vapor deposition method, or MCVD method, is a classic process developed by Mache8ney and others at AT&T Bell Laboratories in the United ...

AI Technical Summary

Problems solved by technology

[0004] First, when the concentration of hydrogen in the air reaches a certain limit, an explosion will occur, and long-term use of hydrogen will pose a huge safety hazard;

[0005] Second, hydrogen combustion will generate a large amount of heat and exhaust gas. In order to maintain the temperature and humidity of the operating environment, these exhaust gases need to be pumped and treated, which will increase the corresponding equipment investment and operating costs.

This will affect the window of the transmission system near 1385nm, as well as adversely affect the transmission performance of other operating bands (such as 1310nm to 1550nm)

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