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41. 发明专利

JPS589106A SUBMARINE OPTICAL FIBER CABLE TRANSMISSION LINE 失效
公开(公告)号：JPS589106A
公开(公告)日：1983-01-19
申请号：JP10775381
申请日：1981-07-10
申请人： NIPPON TELEGRAPH & TELEPHONE
发明人： MURAKAMI TAIJI , KOJIMA SHINYA , ISHIHARA HIROSHI , YAMASHITA KATSUYA
IPC分类号： H01B7/14 , G02B6/44
摘要： PURPOSE:To protect a long submarine optical cable against invasion of sea water, by connecting a connecting box which has incorporated with a cofferdam device, to the front and rear of a submarine optical repeater by use of a short submarine optical cable. CONSTITUTION:A short submarine optical cable 11 connects an optical repeater box 9 and an optical cable connecting box 10 which is incorporated with a cofferdam, transmissively, electrically and mechanically. The optical cable connecting box 10 is constituted of a pressure resistance cylinder 2, a cable anchor device 7, an optical cable 8, an optical fiber core 13, a fiber connecting part 14, and a cofferdam 15, as shown in the figure. For instance, in case when sea water has intruded into the repeater box due to breakage of the bellows, intrusion of sea water into a long cable 12 can be prevented by the cofferdam 15 in the connecting box 10, although sea water intrudes into the short optical cable 11. In this way, the long submarine optical cable 12 can be protected by the connecting box 10.

42. 发明专利

JPS57185407A CONNECTING PART OF OPTICAL FIBER FOR SINGLE MODE TRANSMISSION 失效
公开(公告)号：JPS57185407A
公开(公告)日：1982-11-15
申请号：JP7019181
申请日：1981-05-12
申请人： NIPPON TELEGRAPH & TELEPHONE
发明人： MURAKAMI TAIJI , KOJIMA SHINYA , ISHIHARA HIROSHI , YAMASHITA KATSUYA
IPC分类号： G02B6/24 , G02B6/26
摘要： PURPOSE:To perform the connecting of optical fibers with a loss of connection less than the prescribed value by just the mechanical positioning, by setting the difference between the outer diameters of the cladding parts of two optical fibers and the degree of eccentricity between the cladding part and the core part of each fiber at the value less than a prescribed level respectively. CONSTITUTION:The difference of the outer diameters is set at

43. 发明专利

JPS56126808A PREPARATION FOR ROUND LIGHT WAVEGUIDE LINE 失效
公开(公告)号：JPS56126808A
公开(公告)日：1981-10-05
申请号：JP2915180
申请日：1980-03-10
申请人： NIPPON TELEGRAPH & TELEPHONE
发明人： MURAKAMI TAIJI , IKEDA MASAHIRO
IPC分类号： G02B6/13 , G02B6/30
摘要： PURPOSE:To reduce a connection loss to a cyindrical optical fiber, by making round the sectional form of a light waveguide line. CONSTITUTION:A glass layer of a high refractive index, having a lower softening temperature than that of the substrate 6 is formed on the substrate made of a light resisting material. A waveguide line having a rectangular section is formed by performing, for instance, the reactive spatter etching treatment. Subsequently, the whole substrate 6 on which the rectangular waveguide line has been formed is retained for a few minutes at a temperature which is lower than a softening temperature which is lower than a softening temperature of the substrate, and also higher than a softening temperature of glass forming the waveguide line. As a result, the waveguide line is shaped to a waveguide line 10 having a round section, by means of surface tension of said glass. The waveguide line is embedded by use of a glass layer which has a lower softening temperature than that of glass forming the waveguide 10, and has a lower refractive index than that of said glass. Subsequently, it is made a transparent glass layer 12 by heating to 1,000-1,200 deg.C.

44. 发明专利

JPS5685709A METHOD AND APPARATUS FOR MANUFACTURING GLASS WAVEGUIDE PATH FOR FIBER OPTICS 失效
公开(公告)号：JPS5685709A
公开(公告)日：1981-07-13
申请号：JP16274179
申请日：1979-12-17
申请人： NIPPON TELEGRAPH & TELEPHONE
发明人： IZAWA TATSUO , MORI HIDEFUMI , SHIMIZU NOBUO , MURAKAMI TAIJI
IPC分类号： G02B6/13
摘要： PURPOSE:To obtain homogeneous glass layers with high reproducibility by synthesizing glass fine particles in a reactor, depositing them on substrates in the reactor, and heating the substrates to convert the particles into transparent glass layers. CONSTITUTION:Halide of Si, Ti or the like and oxygen or steam introduced into reactor 1 are heated with heater 5 to form oxide glass fine particles of SiO2, TiO2 or the like by oxidation or hydrolysis, and the particles are deposited in reactor 1 in an about uniform thickness. Accodingly, glass fine particles 7 are also deposited on substrates 6. Each substrate 6 with glass fine particle layer 7 deposited is fixed on substrate stand 11 having a smooth surface and made of refractory material such as graphite, and substrate 6 is heated with heater 12 to make layer 7 transparent. Patterning is then carried out in a predetermined process.

45. 发明专利

JPS5640808A VARIABLE TYPE PHOTO DIRECTIONAL COUPLER 失效
公开(公告)号：JPS5640808A
公开(公告)日：1981-04-17
申请号：JP11612279
申请日：1979-09-12
申请人： NIPPON TELEGRAPH & TELEPHONE
发明人： MURAKAMI TAIJI , MIKAMI OSAMU , IZAWA TATSUO
IPC分类号： G02B6/12 , G02F1/11 , G02F1/335
摘要： PURPOSE:To make manufacture easy by parallel disposing the two optical waveguides comprising transparent dielectric or liquid of a refractive index higher than that of the circumference within a substrate so that ultrasonic waves may be propagated in the optical waveguides and changing the propagation constants of the optical waveguides by ultrasonic waves thereby changing the coupling constant thereof. CONSTITUTION:Optical waveguides 2, 2' of transparent dielectric or CCl4 of a refractive index higther than that of the circumference are formed within a substrate 1 of glass or the like. These optical waveguides 2, 2' have parallel parts 2A and 2A' of a length l. An ultrasonic transducer 3, an electrode 5 and a reflecting plate 6 are provided to the substrates and ultrasonic waves are generated with a high- frequency electric power source 4. The light 7 incident to one waveguide 2 couples 100% in the parallel parts 2A, 2A' and is taken out as exit light 8 from the waveguide 2'. If the ultrasonic waves are generated and the inter-axis distance between the waveguides 2 and 2' is set at a half wavelength, a propagation constant difference is produced in the two optical guides 2, 2', and this makes the intensity of the exit rays 8 and 9 variable. Thereby, the manufacture of the variable couplers of low losses can be made easy.

46. 发明专利

JPS5478144A OPTICAL FILTER 失效
公开(公告)号：JPS5478144A
公开(公告)日：1979-06-22
申请号：JP14518277
申请日：1977-12-05
申请人： NIPPON TELEGRAPH & TELEPHONE
发明人： MURAKAMI TAIJI , TSUCHIYA HARUHIKO
IPC分类号： G02B6/00 , G02B6/28 , G02B6/293 , G02B6/34
摘要： PURPOSE:To eliminate the need for optical axis adjustment and provide a small filter of sharp rise by making use of the optical loss of a single mode waveguide of different radii of curvature or multiple waveguides of the same radius of curvature. CONSTITUTION:The incident light to a single mode optical guide 1 with an external layer is bisected to the guide light by the core part 4 and the radiation light reflecting at the boundary 6 with the external layer of the clad 5 of a refractive index n2 smaller than that of the core part 4 and a half-amplitude level (b) by the bent parts whose radii of curvature R1 thru R3 become subsequently smaller. When the conditions of the formulas I, II wherein the phase difference of the radiation light and guide mode becomes N(integer) times of 2pi are satisfied, coupling of the radiation light and guide light becomes maximum and the guide light is converted to the radiation light, which is then radiated to the outside from the reflection point of the boundary 6, thus the light loss of the guide light becomes large. (In the formulas beta : the phase constant of the guide mode, K : the number of light waves of free space)

47. 发明专利

JPS53144351A WAVELENGTH VARIABLE LIGHT ISOLATOR 失效
公开(公告)号：JPS53144351A
公开(公告)日：1978-12-15
申请号：JP5955577
申请日：1977-05-23
申请人： NIPPON TELEGRAPH & TELEPHONE
发明人： MURAKAMI TAIJI , TSUCHIYA HARUHIKO
IPC分类号： G02B6/00 , G02B6/34 , G02B27/28
摘要： PURPOSE:To change wavelengths used by applying a plane distortion to an optical fiber to let it act as a polarizing element, combining this with a linear polarizer to form a light isolator and controlling the plane distortion to be applied to said optical fiber.

48. 发明专利

JP2001141956A OUTLET FOR OPTICAL CONNECTOR 失效
公开(公告)号：JP2001141956A
公开(公告)日：2001-05-25
申请号：JP32175699
申请日：1999-11-11
申请人： NIPPON TELEGRAPH & TELEPHONE
发明人： TAKATANI MASAAKI , NAGASAWA SHINJI , MURAKAMI TAIJI
IPC分类号： G02B6/36
摘要： PROBLEM TO BE SOLVED: To provide an outlet for an optical connector capable of economically efficiently constructing an optical wiring system. SOLUTION: An adapter 53 for the optical connector is attached to an outlet front panel 52 which is attached to the front side of an outlet box 51, and the optical connector is connected using the adapter 53 for the optical connector.

49. 发明专利

JPH061934B2 失效
公开(公告)号：JPH061934B2
公开(公告)日：1994-01-05
申请号：JP21380084
申请日：1984-10-12
申请人： NIPPON TELEGRAPH & TELEPHONE
发明人： KAWAMURA JUJI , MURAKAMI TAIJI , KAMINOTANI TAKUYA
IPC分类号： E02F5/10 , F16L1/12 , F16L1/16 , H02G1/02 , H02G1/10

50. 发明专利

JPH01225240A OPTICAL FIBER WIRING BOX 失效
公开(公告)号：JPH01225240A
公开(公告)日：1989-09-08
申请号：JP5091188
申请日：1988-03-04
申请人： NIPPON TELEGRAPH & TELEPHONE
发明人： SASAKI ATSUSHI , NARA SHINICHI , MURAKAMI TAIJI
IPC分类号： G02B6/28 , H04B10/07 , H04B10/27 , H04B10/272 , H04B10/29
摘要： PURPOSE:To improve the reliability of an optical fiber network and operability for the moving and increasing of a terminal node by providing an optical accessor, which has optical bypass function, in an optical fiber wiring box. CONSTITUTION:An optical fiber wiring box main body 2 is set the cable gathering point of a star-shaped optical wiring, for which optical fiber cables 1, 1', 1'', 4, 4' and 4'' are extended in a star shape and terminal nodes A, B... are connected. In this optical fiber wiring box main body 2, optical accessors 3a, 3b..., which have the optical bypass function, are provided and thus, the various types of correspondence can be executed to the optical fiber network.

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