| 摘要 |
PROBLEM TO BE SOLVED: To provide a method of manufacturing a glass preform for an optical fiber capable of decreasing the characteristics variation in the direction of its length by making the thickness of the glass layer deposited in a reactor tube uniform. SOLUTION: In this method, a reactor tube 20 is rotated while supplying a feed gas from upstream, and it is heated by a heat source 17 which is moved back and forth in the direction of the length of the reactor tube 20, and a glass layer 22 is deposited in the reaction tube 20. In this case, the upstream end of the movement of the heat source 17, which is the starting point of the deposit PUi, is moved stepwise toward the upstream, thus the transient condition from the starting point of deposit PUi to the point where an equilibrium condition of the reaction is reached, which extends by increasing the thickness of the reactor tube 20 with the deposit, is moved to the upstream of an effective part, and the deposit of the glass layer in the effective part is made uniform. COPYRIGHT: (C)2005,JPO&NCIPI
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