Doing the production mannered null medial axis

摘要

PROBLEM TO BE SOLVED: To provide a burner for manufacturing a porous preform of an optical fiber, which improves the efficiency of a synthesis reaction of glass particulates and the deposition efficiency of the glass particulates, and a method of manufacturing the porous preform of the optical fiber using the same.;SOLUTION: The burner for manufacturing of the porous preform of the optical fiber is provided with the burner with a second combustion supporting gas inflow port 25a in a fifth spout 15 and a third combustion supporting gas at a sixth spout 16. The flow rate of the combustion supporting gas to be ejected out of a row 4a of small-bore nozzles is set higher than the flow velocity of the combustion supporting gas ejected out of a row 4b of the small-bore nozzles in an initial stage during the deposition of the glass particulates and the flow velocity of the combustion supporting gas is set lower than the flow velocity of the combustion supporting gas in the final stage during the deposition of the glass particulates.;COPYRIGHT: (C)2003,JPO