Method for manufacturing an optical fiber preform by MCVD

Abstract

Disclosed is a method for manufacturing an optical fiber preform in MCVD, which simultaneously performs an etching process for injecting a reaction gas for etching into a tube and a collapsing process for heating and collapsing the tube in order to minimize or eliminate an index dip existing at the center of the preform core. By using this method, the index dip phenomenon of the optical fiber preform can be minimized or eliminated, so it is possible to make an optical fiber having improved optical characteristics, particularly having improvement in a bandwidth and a polarization mode dispersion (PMD).

Description

technical field [0001] The present invention relates to methods for preparing optical fiber preforms using modified chemical vapor deposition (MCVD), and more particularly to methods for preparing optical fibers with improved optical properties by eliminating index dips produced during processing steps method. In particular, by employing this method, multimode optical fibers capable of transmitting gigabits can be prepared without other auxiliary materials. Background technique [0002] Figure 1a is a flow chart showing a method for preparing an optical fiber preform according to conventional MCVD. [0003] In general, an optical fiber preform is prepared by a deposition step 100 and a shrinkage step 200-400. More specifically, the shrinking step includes a shrinking step 200 , an etching step 300 and a sealing step 400 . [0004] As known to those skilled in the art, methods for preparing optical fiber preforms can be classified into external deposition methods and inte...

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Problems solved by technology

[0016] However, this patent does not disclose a method of optimizing the inner diameter of the tube by simultaneous etching and shrinkage prior to the sealing s

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