Q.

                       uses flame hydrolysis stems from work on soot processes which were used to prepare the fiber with losses below 20 dB/km.

A. outside vapor phase oxidation
B. chemical vapor deposition
C. liquid phase melting
D. crystallization
Answer» A. outside vapor phase oxidation
Explanation: outside vapor phase oxidation is a type of vapor flame hydrolysis. it was originally developed by hyde. in this process, the glass composition is deposited from a ‘soot’ generated by hydrolyzing the halide vapors in an oxygen-hydrogen flame.
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