B - Operations – Transporting – 29 – D
Patent
B - Operations, Transporting
29
D
26/197
B29D 11/00 (2006.01) B29D 12/00 (2006.01) C03B 37/014 (2006.01)
Patent
CA 1148341
ABSTRACT OF THE DISCLOSURE A method of fabricating a single-mode optical fiber pre- form wherein a core torch produces fine glass particles eccentri- cally with respect to the center area of a flame stream, the core torch being so arranged as to blow the flame stream at an angle inclined to a seed rod. The porous glass body forming the core is grown on one end of the rod and in the direction of the axis of the rod. A cladding layer is formed on the periphery of the porous glass core body by at least one torch for forming the cladding. The obtained porous glass body is heated and vitrified into a transparent glass body, which is sealed in a silica tube for jacketting to form a single-mode optical fiber preform. At least one exhaust port is disposed with a distance of 1 mm to 50 mm from the periphery of the porous glass body and in the vicinity of the growing surface of the glass body to exhaust residual glass fine particles and undesired gases. A porous glass body having a dia- meter of 20 mm or less is easily formed. Single-mode optical fiber having a cladding-to-core-diameter ratio of 3 or more is fabricated by the VAD method. Accordingly, a long-length and low- loss single-mode optical fiber is mass-produced.
360709
Edahiro Takao
Kawachi Masao
Suto Shoichi
Tomaru Satoru
Gowling Lafleur Henderson Llp
Nippon Telegraph & Telephone Public Corporation
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