Process for the production of optical fiber preforms

Details Process for the production of optical fiber preforms Process for the production of optical fiber preforms

C - Chemistry, Metallurgy

03

B

117/85

C03B 37/018 (2006.01) C03B 37/014 (2006.01)

Patent

CA 1213181

PROCESS FOR THE PRODUCTION OF OPTICAL FIBER PREFORMS ABSTRACT OF THE DISCLOSURE An improved process for the production of optical fiber porous preforms of predetermined refractive index distribution by the vapor-phase deposition method is disclosed wherein a glass material and a dopant material are subjected to flame oxidation by the use of an oxyhydrogen burner to form fine glass particles which are deposited on one end of a support- ing rod adapted to move apart from the oxyhydrogen burner while rotating to allow a rod-like porous preform to grow thereon. The improved process is characterized in that the correlation between the shape of the deposition face and the refractive index distribution is previously determined mathematically, and on a basis of the correlation therebetween, a process variable such as the distance between the porous preform and the burner is adjusted to produce the desired shape of the deposition face whereby there can be obtained an optimum refractive index distribution.

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