Back to results
US 4,378,986 AGranted
Method of manufacturing optical fibers
AssigneeNippon Electric Co., Ltd.
InventorsTomoo Yanase, Motohiro Arai
Life of this patent
Estimating the term…
Abstract
A method of manufacturing optical fibers by applying to a substantially cylindrical thin glass member layers of porous glass having a radially varying composition by means of pulverized glass generators. The porous glass layers are heated and defoamed to form a transparent glass preform containing the thin glass member which preform is heated and drawn to reduce the cross-sectional area to form an optical fiber.
Claims19
A method of manufacturing an optical fiber having core and clad sections, comprising the steps of:
- forming around a thin glass member first porous glass layers which, together with said thin glass member, are to constitute a core section of said optical fiber;
- forming around said first porous glass layers second porous glass layers which are to constitute a clad section of said optical fiber;
- heating and defoaming said first and second porous glass layers to produce a transparent glass preform;
- heating said transparent preform so formed to a drawing temperature thereof;
- and
- drawing the heated transparent preform to reduce the cross-sectional area of said thin glass member and said first porous glass layers to form a core section of said optical fiber, the reduced cross-sectional area of said thin glass member constituting a part of said core section, the reduced cross-sectional area of said first porous glass layers constituting the remainder of said core section.
3 more elements
A method of manufacturing an optical fiber, comprising the steps of:
- providing a substantially cylindrical thin glass member;
- rotating said glass member about a longitudinal axis thereof;
- applying pulverized glass materials to said glass member to form porous glass layers thereon;
- heating and defoaming said porous glass layers to from a transparent glass preform;
- heating said transparent preform to a drawing temperature thereof;
- and
- drawing the heated transparent preform to reduce the cross-sectional area of said thin glass member and said porous glass layers to form a core section of an optical fiber, the reduced cross-sectional area of said thin glass member constituting a part of said core section, the reduced cross-sectional area of said porous glass layers constituting the remainder of said core section.
4 more elements
A method of manufacturing an optical glass fiber, comprising the steps of:
- providing a substantially cylindrical thin glass member having a diameter between 100 microns and 1 millimeter;
- rotating and moving said glass member in a vertical direction past a series of vertically disposed pulverized glass generators;
- applying to said thin glass member, as it moves past said pulverized glass generators, a series of layers of pulverized glass to form a plurality of radial layers of porous glass on said thin glass member;
- defoaming the thin glass member having thereon said plurality of layers of porous glass to form a transparent glass preform;
- heating and drawing said transparent glass preform to reduce the cross-sectional area of said thin glass member and the radially innermost of said porous glass layers to form a core section of said optical glass fiber, the reduced cross-sectional area of said thin glass member constituting only a small part of said core section, said radially innermost porous glass layers constituting the remainder of said core section.
2 more elements
A method of manufacturing an optical glass fiber, comprising the steps of:
- providing a substantially cylindrical thin glass member;
- rotating said glass member;
- vertically moving a pulverized glass generator relative to said glass member to apply thereto a plurality of radial layers of porous glass;
- defoaming the thin glass member having thereon said plurality of layers of porous glass to form a transparent glass preform;
- heating and drawing said transparent glass preform to reduce a cross-sectional area of said thin glass member and the radially innermost of said porous glass layers to form the core section of an optical glass fiber, the reduced cross-sectional area of said thin glass member constituting only a small part of said core section, said radially innermost porous glass layers constituting the remainder of said core section.
2 more elements
Dependencies are inferred from the claim text.