公开(公告)号：JPH02242204A

公开(公告)日：1990-09-26

申请号：JP6212389

申请日：1989-03-16

Applicant: FUJITSU LTD

Inventor： OKAMURA KOJI ,  ARIMA TADAO

IPC: G02B6/28

Abstract: PURPOSE:To form optical fiber couplers with slight unevenness in characteristics by connecting optical fibers each having a Y-shaped tapered branching part to both ends of a waveguide. CONSTITUTION:Two optical fibers are adhered parallel to each other, melt- bonded by heating and drawn. The central part of the resulting drawn fiber is cut to form a Y-shaped tapered branching part 1. Such parts 1 are connected to both ends of a waveguide 2 having a prescribed shape to produce an optical fiber coupler. Such characteristics as a desired branching ratio can be obtd. independently of conditions in production in accordance with the shape of the waveguide 2 and optical fiber couplers with slight unevenness in characteristics are produced.

公开(公告)号：JPH02205808A

公开(公告)日：1990-08-15

申请号：JP2685389

申请日：1989-02-06

Applicant: FUJITSU LTD

Inventor： ARIMA TADAO ,  OKAMURA KOJI

IPC: G02B6/32 ,  G02B6/02 ,  G02B6/255

Abstract: PURPOSE:To optimize the curvature of the spherical surface of the tip of an optical fiber by processing an image, obtained by photographing, enlarging, and displaying the tip shape of the optical fiber which is becoming spherical by a television camera, by a central processor and comparing its curvature with the best curvature. CONSTITUTION:When the tip surface of the fiber is machined into a spherical surface with desired curvature, the image of the fused fiber tip 1A is displayed on a television monitor 21 by using the television camera 20 and processed by the central processor 25. Then when the fiber tip 1A is machined to the best curvature, the supply of gaseous hydrogen and gaseous oxygen to an oxygen and hydrogen burner 10 is stopped under the command of the central processor 25. The surface of the fiber tip 1A which is thus made spherical is compared with the best curvature, and consequently the obtained spherical surface of the fiber tip nearly has the best curvature, the shape of the fiber tip surface becomes stable, and its variance is reduced.

公开(公告)号：JPH01154008A

公开(公告)日：1989-06-16

申请号：JP31471087

申请日：1987-12-10

Applicant: FUJITSU LTD

Inventor： ARIMA TADAO ,  OKAMURA KOJI

IPC: G02B6/28

Abstract: PURPOSE:To decrease the wavelength spacing of wavelength multiplex signal light rays which can be separated by feeding one end side of a pair of juxtaposed optical fibers relatively toward a heating means and welding and stretching the optical fibers to each other while detaching the other end side of the optical fibers relatively from the heating means at the speed higher than the feed speed. CONSTITUTION:The optical fibers 1, 2 are welded to each other and are stretched while the one end side 3 of a pair of the juxtaposed optical fibers 1, 2 is fed in relatively toward the heating means 4 and the other end side 5 of the optical fibers 1, 2 is detached relatively from the heating means 4 at the speed higher than the feed speed. The optical fiber pair is heated over a wide range while the one end side 3 and the other end side 5 of the optical fiber pair are moved relatively to the heating means 4 in such a manner and, therefore, the sufficiently long welded and stretched part is formed. The wavelength spacing of the separable wavelength multiplex signal light rays is thereby decreased.

公开(公告)号：JPS63314418A

公开(公告)日：1988-12-22

申请号：JP15161187

申请日：1987-06-18

Applicant: FUJITSU LTD

Inventor： OKAMURA KOJI ,  ARIMA TADAO ,  MIKI MASAJI

IPC: G01F17/00 ,  B67D7/72 ,  G01F22/02

Abstract: PURPOSE:To enable detection of residue of a liquid in a closed container simply without use of a belows tube, by measuring a required time or the like until the liquid begngs to flow out from the start of the injection of a gas. CONSTITUTION:It is assumed that when a gas is injected at a flow rate L into a closed container 2 filled with a gas with a specified pressure P0, time (t) is required until a fluid 4 begins to flow out from the start of the injection of a gas. Here, the required time (t) is primarily determined according to a gas volume VG within the closed container 2. The gas volume VG in the closed container 2 can be determined by measuring the required time (t). Thus, the capacity VL of a liquid 4 held in the closed container 2 can be detected. If a specific gravity rho of the liquid 4 is known beforehand, the weight M of the liquid 4 can be determined from the capacity VL. This enables detection of a residue value of the liquid in the closed container simply using no bellows tube.

公开(公告)号：JPS61134708A

公开(公告)日：1986-06-21

申请号：JP25799584

申请日：1984-12-05

Applicant: Fujitsu Ltd

Inventor： KOJIMA JUN ,  ARIMA TADAO ,  TAKASHIMA TAKASHI

IPC: G02B6/24 ,  G02B6/26

Abstract: PURPOSE:To make possible the uniform soldering of a lens and holder over the entire circumference by attaching film-like solder to glass optical parts, inserting or butting said parts to metallic parts and heating the parts while applying ultrasonic oscillation thereto thereby soldering and fixing the parts. CONSTITUTION:A solder film 7 prepd. by stretching glass dolder to about 20-300mum by a roller on a lens 1 is prepd. The lens 1' constituted by adhering the solder film 7 to the lens 1 is inserted into the lens insertion hole 21 of a holder 2 which consists of a metal, for example, stainless steel, etc. and is provided with the lens insertion hole 21 and a solder insertion hole 22 in the lens fixing position. The holder 2 is imposed on a heater 5 and an ultrasonic oscillating machine 8 is pressed to the hole 22 of the holder 2. The lens is heated to about 300 deg.C while the ultrasonic wave is applied thereto, then the soldering uniform over the entire circumference without solder build-up is executed.

Abstract translation: 目的：为了使透镜和保持器在整个圆周上的均匀焊接，通过将薄膜状焊料附着到玻璃光学部件上，将所述部件插入或对接到金属部件并加热部件同时施加超声波振荡，从而焊接和固定 部分。 构成：焊料膜7制备 通过将透镜1上的辊拉伸至约20-300μm的玻璃钵来制备。 通过将焊料膜7粘附到透镜1构成的透镜1'被插入到由金属例如不锈钢等构成的保持器2的透镜插入孔21中，并且设置有透镜插入孔21 以及透镜固定位置中的焊料插入孔22。 将保持器2施加在加热器5上，并且将超声波振荡机8按压到保持器2的孔22中。将镜头加热至约300℃，同时向其施加超声波，然后将焊接均匀 执行没有焊料积聚的整个周长。

公开(公告)号：JPS6011243A

公开(公告)日：1985-01-21

申请号：JP11739083

申请日：1983-06-29

Applicant: FUJITSU LTD

Inventor： MIKI MASAJI ,  ARIMA TADAO

IPC: C03B37/014 ,  C03B37/018 ,  G02B6/00

Abstract: PURPOSE:To obtain the titled base material having a uniform refractive index distribution in the longitudinal direction by changing the concn. of a dopant along the longitudinal direction of a glass pipe so as to provide a prescribed refractive index profile when the dopant is added during collapsing. CONSTITUTION:A quartz glass pipe 1 is rotated, and an oxyhydrogen burner 2 is moved from the inlet side of the pipe 1 to the outlet side with a positioning device 3. Gaseous Ar is sent to a dopant generator 6 through a controller 5, a generated dopant is mixed with gaseous O2 sent through a controller 4, and the gaseous mixture is introduced into the pipe 1. The controller 5 is controlled with a processor 7 so that the flow rate of gaseous Ar is continuously reduced in accordance with the movement of the burner 2 from the inlet side of the pipe 1 to the outlet side. By reducing the flow rate, the concn. of the dopant is changed along the longitudinal direction of the pipe 1 so as to provide a prescribed refractive index profile when the dopant is added during collapsing.

公开(公告)号：JPS6011241A

公开(公告)日：1985-01-21

申请号：JP11588983

申请日：1983-06-29

Applicant: FUJITSU LTD

Inventor： MIKI MASAJI ,  ARIMA TADAO ,  TSUKAMOTO MAKOTO

IPC: C03B37/018 ,  G02B6/00

Abstract: PURPOSE:To prevent the formation f a P-OH group and to manufacture the titled base material with a small loss by introducing a gaseous mixture of GeCl4 with O2 and Cl2 into a quartz glass pipe having a core layer deposited by an MCVD method and by heating the pipe to a high temp. from the outside. CONSTITUTION:A gaseous mixture of SiCl4 with GeCl4 and POCl4 is introduced into a quartz glass pipe to deposit a core layer by an MCVD method. A gaseous mixture of GeCl4 with O2 and Cl2 is then introduced into the pipe, and the pipe is heated to a high temp. from the outside to evaporate formed P2O5. After repeating the deposition of a core layer, the introduction of said gaseous mixture and the heat treatment about 50 times, the quartz glass pipe is compressed to obtain a base material for an optical fiber with a small loss in a longer wavelength zone.

公开(公告)号：JPS607410A

公开(公告)日：1985-01-16

申请号：JP11503483

申请日：1983-06-28

Applicant: FUJITSU LTD

Inventor： ARIMA TADAO ,  MIKI MASAJI

IPC: G02B6/42

Abstract: PURPOSE:To control the extent of higher-order mode excitation to an optimum quantity of incident light, and use an optical fiber in a maximum transmission band state by providing an adjusting mechanism for the incidence conditions of the optical fiber between a condenser lens and an optical fiber end part. CONSTITUTION:Light emitted by a light emitting element 14 is incident on a lens 11 to obtain a parallel beam P, which strikes a pinhole 13. The striking beam is made incident to a lens 12 through the hole 131 of the pinhole 13. Therefore, the quantity of the incident light beam between the pinhole 13 and lens 12 is small depending upon how large the angles of incidence to spaces A and B encircled with broken lines and solid lines are large. Then, adjusted light beam is converged by the lens 12 and incident on the optical fiber 15. Thus, incidence NA to the optical fiber 15 is adjusted.

公开(公告)号：JPS5845134A

公开(公告)日：1983-03-16

申请号：JP14188681

申请日：1981-09-09

Applicant: FUJITSU LTD

Inventor： MIKI MASAJI ,  ARIMA TADAO

IPC: C03C25/42 ,  C03B37/10 ,  G02B6/44

Abstract: PURPOSE:To reduce the optical transmission loss of a coated optical fiber by blowing off molten metal on the surface of an optical fiber with a hot gas at the outlet of a molten metal vessel to make the resulting metallic layer coating the surface of the fiber uniform and thin. CONSTITUTION:To coat an optical fiber with a metallic layer for increasing the strength in a uniform thickness, the thickness of the layer is adjusted to about 20mum. By making the thickness smaller, the optical transmission loss of the coated fiber is reduced, so a gas such as N2 is sprayed at high temp. and pressure from lower air dies 6 made of heat resistant material on an optical fiber 11 discharged from the pulling hole 3' of a vessel 3 together with a molten metal 41 such as molten Al stuck to the fiber. Molten Al on the surface of the fiber 11 is blown off to form a thin layer having about 10mum uniform thickness. Thus, a metal-coated optical fiber 12 with a small optical transmission loss is taken out.

公开(公告)号：JPS5845133A

公开(公告)日：1983-03-16

申请号：JP14188481

申请日：1981-09-09

Applicant: FUJITSU LTD

Inventor： ARIMA TADAO ,  MIKI MASAJI

IPC: C03C25/42 ,  C03B37/10 ,  G02B6/44

Abstract: PURPOSE:To prevent a reduction in the tensile strength of a thin film of a malleable metal coating the surface of an optical fiber due to oxide introduced into the metal by installing a furnace for melting the metal in an inert gaseous atmosphere. CONSTITUTION:A base material 10 for an optical fiber is passed through a heating furnace 2 and softened by heating. An optical glass fiber 11 is drawn from the tip of the material 10, and it is passed through a vessel 8 holding a molten metal 7 with superior malleability such as molten Cu, Al or Sn in an electric resistance furnace 11 to form an optical fiber 12 coated with the metal 7 in 10-30mum thickness. At this time, by feeding an inert gas such as N2 or Ar from a blowhole 91 to the vessel 9 for a metal melting furnace 8, the vessel 9 is filled with a nonoxidizing atmosphere to prevent the partial oxidation of the molten metal 7, thereby preventing a reduction in the tensile strength of the metallic layer coating the fiber 12 due to oxide introduced into the metal.