FIELD: process engineering.
SUBSTANCE: invention relates to preform fabrication and processing, preform and optical fibre. Proposed method comprises preliminary processing stage whereat silicon dioxide powder is fed into quartz tube with open top end and stopped bottom end to make a green preform. It includes also finishing stage whereat inner space of said quartz tube is plugged and evacuated. Said green preform is heated to final temperature for smelting of quartz tube and silicon dioxide powder. note here that at preliminary stage silicon dioxide powder fed into inner space is subjected to heat treatment at intermediate temperature lower than powder melting point.
EFFECT: ruled out fracture of thin-wall quartz tube at high temperature in preform.
13 cl, 13 dwg
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