C - Chemistry – Metallurgy – 03 – B
Patent
C - Chemistry, Metallurgy
03
B
26/197, 49/8
C03B 37/025 (2006.01) C03B 37/018 (2006.01)
Patent
CA 1242889
-8- ABSTRACT: In the PCVD method, glass layers are deposited on the inner wall of a glass tube heated at a temperature between 1100 and 1300°C by passing a reactive gas mixture through the glass tube at a pressure between 1 and 30 mbar, while a plasma is reciprocated strokewise in the interior of the glass tube. The glass tube, after a sufficient number of glass layers has been deposited, is collapsed so as to form a solid preform from which optical fibres are drawn. In order to achieve cylindrically symmetrical refractive index profiles, the heated glass tube is con- tinuously rotated during the deposition of the glass layers. The direction of rotation of the glass tube is reversed every time the direction of movement of the plasma is reversed.
458634
Geittner Peter E.e.
Lydtin Hans
Wilson Howard J.c.
N.v. Philips Gloeilampenfabrieken
Van Steinburg C.e.
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