Sumitomo Electric Industries, Limited

Tomomi Moriya

Tatsuhiko Saito

Tomomi Sano

Motonori Nakamura

Osamu Kasuu

Rei Koike

Shinji Kayou

Eisuke Sasaoka

Masaaki Hirano

Masashi Onishi

Yuji Kobayashi

Yoichi Ishiguro

Kazuyuki Sohma

Tadashi Enomoto

Dai Sasaki

Hiroshi Kohda

Keiji Osaka

Kazunari Hattori

Shigeru Semura

Kazumasa Oishi

Eiji Yanada

Yoshiji Sato

Tatsuo Saito

Kenji Io

Yukio Nomura

Katsuichi Omori

Yoshiharu Meguro

This burner for producing a fine glass particle deposited body is provided with a metallic gas-feed pipe that forms a burner body, and a cover for covering the gas-feed pipe, wherein: the gas-feed pipe and the cover are integrally formed; the gas-feed pipe has connected thereto a piping through which material gas, oxyhydrogen gas, and seal gas are supplied; and the cover covers, in the axial direction of the burner over a prescribed length and in a given constant outer diameter, the gas-feed pipe and a connection part of the piping connected to a lateral surface of the gas-feed pipe.

Burner for producing glass fine particle deposited body, and device and method for producing glass fine particle deposited body

This raw material supply device supplies a raw material for producing glass fine particle deposits, to a burner and includes a raw material tank; a liquid raw material pipe having one end thereof connected to the raw material tank; a liquid raw material pressure feed pump that pumps siloxane, being a liquid raw material, from the raw material tank via the liquid raw material pipe; a pressure adjustment valve provided on a secondary side of the liquid raw material pressure feed pump in the liquid raw material pipe; an MFC for liquid, connected to the other end of the liquid raw material pipe; and an aeration device that is connected to the secondary side of the MFC for liquid and aerates the liquid raw material. The pipe on the secondary side of the pressure adjustment valve is connected to a location having lower pressure than the primary side pressure.

Raw material supply device for production of glass fine particle deposits and raw material supply method

The sealing componentof the invention is provided with a metallic housingthat comprises a base part, a side wallconnected to the base partand an opening portionfacing to the base part, and a metallic lidto cover the opening portion, wherein a melted portionis formed around the boundary between the lidand the upper edge, the melted portionis formed to reach the cornerof the side wall, and the melted portionhas a convexly-curved outward formfrom the top face of the lidto the cornerin the longitudinal cross-sectional view of the sealing component

Sealing component, optical device sealing structure, method for producing sealing component, and method for producing optical device sealing structure

A molding dieis constituted by an upper dieand a lower diewhich are made of a material transparent to an ultraviolet light, and has a cavityconstituted by grooves, whereas a resin injection gateand a resin exit gateare provided so as to communicate with the cavity. A junction of an optical fiberis inserted into the cavity. A UV-curable resin is injected into the cavitysurrounding an exposing portion of the glass optical fiberfrom the resin injection gatepositioned at one of coating ends of the optical fiber, whereas a part thereof is discharged from the resin exit gatepositioned at the other coating end. The ultraviolet light is emitted through the lower dieso as to cure the resin, thereby forming a reinforcement resin coating. As a consequence, bubbles can be prevented from occurring due to the residual air within the reinforcement resin coating in the junction of the optical fiber

MOLDING APPARATUS FOR A REINFORCEMENT RESIN COATING OF GLASS OPTICAL FIBER EXPOSING PORTION OF AN OPTICAL FIBER JUNCTION, METHOD FOR MOLDING REINFORCEMENT RESIN COATING OF A GLASS OPTICAL FIBER EXPOSING PORTION OF AN OPTICAL FIBER JUNCTION, AND OPTICAL FIBER CABLE

Stress exerted on an inner or outer circumferential side of a glass tubeis controlled when a glass materialis heated and softened by a heating elementprovided around the glass materialand a piercing plugis relatively pressed into a softened region of the glass materialto thereby form the glass materialinto the glass tubegradually. For example, the control of the stress can be carried out by controlling an internal or external pressure of the glass tube. As a result, the deformation of the glass tubejust after piercing is prevented so that the glass tubecan be obtained with high quality. It is also possible to solve the problem that cracks may occur easily at the time of reheating because of residual stress distribution after cooling.

Method and apparatus for manufacturing glass tube

A method for handling a fusion-spliced optical fiber and a transferring jig for transporting the optical fiber are provided. The jig is capable of holding the fusion-spliced optical fiber in a state in which a given tension is applied at the spliced portion, and stopping the application of such tension if needed. The jig is easy to transport and set to each of separate processing processes. In the method, a fusion-spliced optical fiber is clamped at coated portions thereof on both sides of the fusion-spliced portion by a pair of clamps of the jig and transported by the jig holding the optical fiber in a state wherein a given tension is applied thereto through the clamps.

Method and jig for handling and transferring fusion-spliced optical fibers

An object is to provide an optical fiber fusion splicing method in which splice loss can be reduced, and also to provide an arc-heating unit used for heating the fusion spliced part of an optical fiber. The method comprises a process of fusion-splicing together the end faces of two optical fibers and a process of continuously heating the fusion spliced part by arc while moving one pair of electrodes provided opposite to each other across the fusion spliced part. The arc heating process is performed with the operation for decreasing arc temperature. The operation for decreasing arc temperature may be achieved by flowing a gas having a molecular weight greater than the average molecular weight of air into a gas atmosphere in which arc heating is performed, or by adding a modulation to an electric discharge current such that the maximum value becomes equal to or more than an electric current for starting arc discharge and the minimum value becomes more than zero and less than the electric current for starting arc discharge.

Method for fusion splicing optical fibers and apparatus for heating spliced part by arc

A method of fusion-splicing optical fibers having different mode field diameters or small mode field diameters is provided, which method is advantageous in that the splicing loss is smaller. The method comprises a fusion splicing process in which fusion splicing is performed by butting end faces of two optical fibers together and a heat treatment process in which the fusion spliced part of the optical fibers and the vicinity thereof are heated. The heat treatment process is performed by moving an arc heating unit in a direction other than the Y-axis direction (a direction perpendicular to the Z-axis direction and the opposing direction of arc electrodes) and Z-axis direction (the axial direction of the optical fiber), via the fusion spliced part in a Y-Z plane formed by the Y-axis direction and Z-axis direction.

Method for fusion splicing of optical fibers

In a method of elongating a glass preform comprising the steps of holding both ends of the glass preform with a first holding section and a second holding section , respectively; moving the first holding section and the second holding section in a longitudinal direction of the glass preform with the moving speed of the first holding section faster than that of the second holding section and, at the same time, heating and softening the glass preform by a heating section successively; and elongating the glass preform by a tensile force applied thereto, so as to form an elongated body ; an electric furnace is employed in the heating section ; and said method further comprising the steps of setting a reference value R with respect to an outside diameter at a specific position in a tapered region in the glass preform in the process of elongating; acquiring an actually measured value R at the specific position ; and controlling the moving speed of the first holding section and/or second holding section according to a value (R /R ) obtained from the reference value R and actually measured value R

Method of elongating glass preform

In a heating furnace which holds at least one end of a glass rod with a holding portion and elongates the glass rod by softening the glass rod successively from the other end portion thereof with heating while applying a tensile force thereto, the heating furnace comprises a tubular portion through which the glass rod to be elongated is inserted such as to be longitudinally movable; heater, positioned within the tubular portion such as to circumferentially surround the glass rod, for heating the glass rod; a moving portion through which one end of the glass rod is inserted; bellows the ends of which are respectively secured to the moving portion and the tubular portion and which is longitudinally expandable and contractible and composed of at least a double cylinder surrounding the part of the glass rod such as to block an outside air from flowing into the heating furnace; and gas supply line for supplying, for purging, an inert gas into a space within the tubular portion and the inner bellows as well as the space between inner and outer bellows.

Glassrod elongation heating furnance having double bellows

A furnace body for a glass preform elongating apparatus which makes an elongated body by passing the glass preform through the furnace body and elongating the glass preform while heating the glass preform, the furnace body comprising a furnace core tube shaped like a cylinder through which the glass preform passes and having so adequate length in an axial direction that the elongated body may not bend or distort its form, a heating member disposed at an outer peripheral portion of the furnace core tube, a thermal insulator enveloping the furnace core tube and the heating member from outside in circumferential and axial directions thereof, and a furnace body outer shell holding the thermal insulator therein, wherein a through hole is disposed near the heating member downstream thereof in an advancing direction of the glass preform so as to penetrate through the furnace core tube, thermal insulator, and furnace body outer shell in the direction orthogonal to the furnace core tube.

Elongating apparatus and method for glass preform and furnace body for

The present invention provides a method for manufacturing an optical fiber coupler in which an optical fiber is elongated and heated by using a heating source under a constant tension. The heat source is controlled based on the ratio of a target elongating speed and an actual elongating speed of the optical fiber.

Growing community of inventors

Yokohama, Japan

Tomomi Moriya