| 摘要 |
A method for producing an optical fiber preform having a large size soot porous body is provided wherein opposite ends of the rod are heated by heating means to achieve a predetermined temperature which is increased in a controlled manner in a stepwise mode or a gradual mode or a non-linear mode by varying flow rate and/or ratio of oxyhydrogen gases to heating means to achieve a particular temperature and soot porous body of desired diameter. In one embodiment, the predetermined temperature is increased to achieve a particular temperature and an intermediate diameter of soot porous body, wherein the particular temperature is optionally maintained till a soot porous body of a desired diameter is produced which is subjected to sintering process to produce the optical fiber preform having a large size soot porous body.
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