| 摘要 |
PURPOSE: A manufacturing method of optical fiber preform is provided to improve processing time by shrinking effect on processing etching-close by forming deposition layer with refractive index and a regular thickness. CONSTITUTION: An additionally deposited addition deposition layer is formed to have oppositely high refractive index on core layer on depositing. An etching-close process etches a part of addition deposition layer with a compound of freon class, at the same time an etching-close process eliminate the inside diameter completely. A deposition process(10) forms a fixed deposition layer by an oxidation reaction in inside of a quartz reaction tube on heating with heater having reciprocating movement for direction of the quartz reaction tube length, after injecting reactant gas compounding SiCl4, GeCl4 and O2 into the quartz reaction tube. A collapsing process(30) forms preform rod to heat the quartz reaction tube composed of three of deposition layer more than softening point. An etching process(40) etches a part of addition deposition layer with more refractive index than the core layer oppositely, at the same time a close process(50) finish preform rod.
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