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61. 发明专利

JPH0954221A CORE ALIGNING METHOD AND ALIGNING DEVICE FOR OPTICAL FIBERS 失效
公开(公告)号：JPH0954221A
公开(公告)日：1997-02-25
申请号：JP21047695
申请日：1995-08-18
申请人： NIPPON TELEGRAPH & TELEPHONE
发明人： KATAGIRI TOSHIAKI , TACHIKURA MASAO
IPC分类号： G02B6/24 , G02B6/255 , G02B6/38 , G02B7/00
摘要： PROBLEM TO BE SOLVED: To provide a core aligning method for connecting optical fibers with low loss and a core aligning device which is small, light and simple as well as an optical connector forming method and a device therefor. SOLUTION: The method for connecting the optical fibers 1-1, 1-2 on fixing V-grooves consists of a first procedure of butting the end faces of the two optical fibers 1-1, 1-2 to be connected on the V-grooves 9a, 9b, a second procedure of observing the core images of the optical fibers 1-1, 1-2 from one flank surface of the optical fibers 1-1, 1-2 while rotating the respective optical fibers 1-1, 1-2 on the V-grooves 9a, 9b, then searching the rotating angles of the respective optical fibers in such a manner that their respective observed core images exist on one side of the visual fields for observation bisected by the central axes of the optical fibers 1-1, 1-2 and that the respective core images part furthest from the central axis of the optical fibers 1-1, 1-2 and a third procedure of fixing the respective optical fibers at the rotating angles.

62. 发明专利

JPH08304675A COATED OPTICAL FIBER 失效
公开(公告)号：JPH08304675A
公开(公告)日：1996-11-22
申请号：JP10509795
申请日：1995-04-28
申请人： NIPPON TELEGRAPH & TELEPHONE
发明人： URUNO SHIGENORI , TACHIKURA MASAO , SATO MAKOTO , TOMITA NOBUO
IPC分类号： G02B6/44
摘要： PURPOSE: To provide a coated optical fiber which is small in diameter and light in weight and has a structure to allow the easy removal of a coating material without damaging optical fibers. CONSTITUTION: This coated optical fiber is formed of the structure obtd. by arranging the optical fiber 10 and glass fibers 20 having the outside diameter larger than the outside diameter of the optical fiber 10 in such a manner that their respective centers are aligned on the same straight line and coating the circumference with a plastic material 30. In such a case, the optical fiber 10 and the glass fiber 20 may be paired or one piece of glass fiber 20 may be arranged between the two pieces of optical fibers 10 or the one piece of optical fiber 10 may be arranged between the glass fiber 20 and the glass fiber 20 or one piece of optical fiber 10 may be arranged between the glass fiber 20 and the glass fiber 20 or the plural pieces of optical fibers 10 may be arranged between the glass fiber 20 and the glass fiber 20 or the glass fibers 20 may be arranged at both ends of the arrangement or the glass fibers 20 may be arranged at both ends or a intermediate part of the arrangement of the plural pieces of optical fibers 10.

63. 发明专利

JPH0843687A OPTICAL CONNECTOR DEVICE 失效
公开(公告)号：JPH0843687A
公开(公告)日：1996-02-16
申请号：JP20279594
申请日：1994-08-04
申请人： FURUKAWA ELECTRIC CO LTD , NIPPON TELEGRAPH & TELEPHONE
发明人： NARAOKA SEIICHI , TACHIKURA MASAO
IPC分类号： G02B6/38
摘要： PURPOSE:To provide a small-sized optical connector device which is integratable in a high density. CONSTITUTION:This optical connector device is composed of an adapter 3 having a fitting hole and an optical connector 4 which is inserted into the fitting hole of the adapter 3 and is freely attachably and detachably fitted therein. The inside wall of the fitting hole 38 of the adapter 3 is provided with a connector engaging part 22 engaging the optical connector 4. The optical connector 4 is provided with a plug frame 7 housing a ferrule 5. The plug frame 7 is provided with engaging pawls 10 for engaging with the connector engaging parts 22 of the adapter 3 projecting obliquely outward near the side peripheral edge thereof when the optical connector 4 is inserted into the adapter 3 and is provided with sliders 11 as pawl pressing means for releasing the engaging state with the adapter 3 of the optical connector 4 freely slidably with the plug frame 7 by pressing and retreating the detaining pawls 10 near the side peripheral edge of the plug frame 7.

64. 发明专利

JPH04367814A MULTI-UNIT OPTICAL FIBER SWITCH AND CONNECTION SWITCHING METHOD 失效
公开(公告)号：JPH04367814A
公开(公告)日：1992-12-21
申请号：JP14440191
申请日：1991-06-17
申请人： NIPPON TELEGRAPH & TELEPHONE
发明人： KATAGIRI TOSHIAKI , TACHIKURA MASAO , SHIMIZU MASATOSHI , KOBAYASHI HIDEO , ISHIHARA HIROSHI
IPC分类号： G02B6/40 , G02B26/08
摘要： PURPOSE:To offer the small-sized multi-unit optical fiber switch and connection switching method which provide low-loss coupling and facilitate repair maintenance. CONSTITUTION:The optical fiber switch consists of a connection part holding plate 6 provided with a hole wherein the connector plug 3-1 and dummy connector plug 3-3 of an upper optical fiber group 2 are arrayed and fitted, the upper optical fiber group 2 which is fitted to the connection part holding plate 6, a lower optical fiber group 2 which is coupled with the connector plug 3-1 of the upper optical fiber group 2, connector transportation inserting and extracting mechanisms 15 which consist of connector plug grippers 16-1 and 16-2 and three-directional positioning mechanisms and provided on both sides of the connection part holding plate 6, a controller 19 which controls the operation of the connector transportation inserting and extracting mechanism 15, and the connector plug 3-2 of the lower optical fiber group 2.

65. 发明专利

JPH03184012A HOLOGRAM TYPE OPTICAL SWITCH 失效
公开(公告)号：JPH03184012A
公开(公告)日：1991-08-12
申请号：JP32263089
申请日：1989-12-14
申请人： NIPPON TELEGRAPH & TELEPHONE
发明人： TACHIKURA MASAO , KATSUYAMA YUTAKA , SATAKE TOSHIAKI
IPC分类号： G02B26/08
摘要： PURPOSE:To provide a smaller insertion loss, smaller size and larger number of terminals by inserting a hologram element having >=1 pairs of holograms into an optical path. CONSTITUTION:The hologram element 5 is disposed between a single fiber plug 3 and a multifiber plug 13. The hologram element 5 is constituted by simmetrically inserting two hologram medium layers 7, 17 between three sheets of glass plates 8, 18, 28 and forming the plural holograms 6, 16 so as to make pairs respectively on the respective hologram medium layers 7, 17. Collimated beams of light refract merely when the collimated beams of light are made incident diagonally on the single hologram but the deflection effect thereof is offset by the passage through the holograms 6, 16 and the collimated beams of the light are eventually moved parallel. Not so much high positioning accuracy is, therefore, required if the holograms are previously formed sufficiently large to the luminous fluxes. The miniaturization of the device and the increase in the number of the switching terminals are possible in this way.

66. 发明专利

JPH02199411A METHOD AND DEVICE FOR REMOVING COATING OF HERMETICALLY COATED OPTICAL FIBER 失效
公开(公告)号：JPH02199411A
公开(公告)日：1990-08-07
申请号：JP1750889
申请日：1989-01-30
申请人： NIPPON TELEGRAPH & TELEPHONE
发明人： YOSHIZAWA NOBUYUKI , KATSUYAMA YUTAKA , TACHIKURA MASAO , INOUE HIROMITSU
IPC分类号： G02B6/00 , G02B6/255 , G02B6/44 , H02G1/12
摘要： PURPOSE:To provide the method and device for removing coating which can surely remove inorg. layers by installing the end faces of two pieces of hermetically coated optical fibers so as to face each other to the center between discharge electrodes facing each other and utilizing the slight discharge by specific discharge conditions. CONSTITUTION:Two pieces of the hermetically coated optical fibers 2 are set at the central part of a pair of the discharge electrodes 1 in such a manner that the fibers intersect orthogonally with the line connecting these discharge electrodes 1 and that the respective end faces face each other. The spacing between the end faces of the discharge electrodes 2 is movable in a range from 100mu to about 1mm by means of fiber fixing bases 4 provided with fine adjustment functions. The inter-electrode spacing is fixed at about 1.5mm and the hermetic coating layers are removed by discharging electricity by a slight discharge condition setting circuit that the discharge energy J and discharge time t satisfy 0.12

67. 发明专利

JPH02157635A DEVICE FOR INSPECTING STABILITY OF LIGHT WAVELENGTH 失效
公开(公告)号：JPH02157635A
公开(公告)日：1990-06-18
申请号：JP31020388
申请日：1988-12-09
申请人： NIPPON TELEGRAPH & TELEPHONE
发明人： TACHIKURA MASAO , KATSUYAMA YUTAKA , SATAKE TOSHIAKI , NEGISHI YUKIYASU
IPC分类号： G01M11/00 , G02B5/32 , G02B27/42 , H01S5/00
摘要： PURPOSE:To accomplish detection with high sensitivity with a simple small-sized constitution by constituting a spectral system by the use of a hologram lens. CONSTITUTION:A laser light beam to be measured from a semiconductor laser 1 passes through an optical fiber 2 and spectrally divided by the hologram lens 3, then is made incident on an optical sensor 5 by setting the clad of a single optical fiber 4 for receiving light as an optical fine aperture. The output from the sensor 5 is recorded by a recording device 6 and the stability of the laser light beam which is easy to be changed by a temperature, etc., is inspected. By constituting the spectral system by the user of the hologram lens without necessitating a precision spectrometer incorporating a diffraction grating or an optical spectral analyzer, etc., the inspection of stability of light wavelength can be performed with high sensitivity by the simple small-sized economy device. Then, the same result is obtained by using a sensor or an optical sensor array corresponding to may fibers for receiving light arrayed in a line.

68. 发明专利

JPH0267504A METHOD FOR SPLICING OPTICAL FIBER BY FUSION 失效
公开(公告)号：JPH0267504A
公开(公告)日：1990-03-07
申请号：JP21850588
申请日：1988-09-02
申请人： NIPPON TELEGRAPH & TELEPHONE
发明人： TACHIKURA MASAO , SATAKE TOSHIAKI , NEGISHI YUKIYASU
IPC分类号： G02B6/255
摘要： PURPOSE:To prevent deterioration in mechanical strength of the splicing section of a pair of optical fibers to be spliced with each other caused by crystallization at the time of fusion by exposing end sections of the pair of coated optical fibers and fusing the end faces of the fibers by heating and, at the same time, heating a thermoplastic resin so that the resin can flow and cover the entire surface of the splicing section of the fibers. CONSTITUTION:End faces of optical fibers 1 of a fluoride to be connected with each other are prepared by removing the covering material 2 of the fibers 1 from the end sections and the end sections of fibers are cut off from points near the ends of the covering material 2. Then the fibers are clamped and aligned to each other on a V-groove base 4 for positioning by means of clamps 5 which clamp the fibers by the covering material and the end faces of the fibers are pressed against each other while the fibers are heated so that the resin covering the fibers can melt and flow toward the end face joining section. In other words, the entire surface of the optical fiber connecting section is covered with the resin. Therefore, deterioration in mechanical strength of the fusion-splicing section by crystallization can be prevented.

69. 发明专利

JPH027006A DISCHARGE FUSION SPLICING METHOD OF OPTICAL FIBER 失效
公开(公告)号：JPH027006A
公开(公告)日：1990-01-11
申请号：JP15896888
申请日：1988-06-27
申请人： NIPPON TELEGRAPH & TELEPHONE
发明人： TACHIKURA MASAO , SATAKE TOSHIAKI
IPC分类号： G02B6/255 , G02B6/24
摘要： PURPOSE:To facilitate fusion splicing by setting the axes of optical fibers to be connected on the plane perpendicular to the straight line passing the front ends of a pair of discharge electrodes disposed to face each other and placing the ends of the optical fiber to be connected in the position nearest said straight line so as to face each other. CONSTITUTION:The front ends of the discharge electrodes 2 are formed to a circular conical or pyramidal shape. Fusion splicing is executed by heating the optical fibers 1 in the position deviated from the discharge region. The optical fibers 1 are heated as a result of the heat radiation r heat transmission from this discharge region. Although the axes of the optical fibers 1 are placed on the plane bisecting the segments connecting the front ends of both the discharge electrodes, said axes may be placed in proximity to the one electrode. Then, discharge plasma is generated on the surface of the front ends of the electrodes as well and, therefore, the controllability of heating is much higher than the heating by a heater consisting of a heating wire and the fusion control is facilitated.

70. 发明专利

JPS63249116A CONNECTOR FOR OPTICAL FIBER 失效
公开(公告)号：JPS63249116A
公开(公告)日：1988-10-17
申请号：JP8253687
申请日：1987-04-03
申请人： NIPPON TELEGRAPH & TELEPHONE , NTT TECHNOLOGY TRANSFER
发明人： TACHIKURA MASAO , TERAKADO KEIICHIRO
IPC分类号： G02B6/24 , G02B6/36
摘要： PURPOSE:To prevent an optical fiber from coming off a groove during the connecting work of the fiber so as to improve the working property, by applying an optical fiber inlaying method, and restraining the movement of the optical fibers in directions other than the longitudinal direction of the base plate. CONSTITUTION:An optical fiber strand section inlaying groove 8 and optical fiber coating section inlaying groove 9 are respectively provided in an optical fiber strand section base plate 6 and optical fiber coating section base plate 7. Cross sections of the grooves 8 and 9 have inverted OMEGA shapes and shoulder sections 8a and 9a are respectively formed to the grooves 8 and 9 in the longitudinal direction of the grooves. V-shaped grooves 10 are formed on both sides of the grooves 8 and 9 so as to reduce the rigidity of the side walls 8b and 9b of the grooves 8 and 9. Since the shoulder sections 8a and provided to the groove 8 so that optical fibers cannot move in directions other than the longitudinal direction, the optical fibers do not come off the groove 8 and, accordingly, no keeping plate is required when the optical fibers are put together and joined. Therefore, the working property of this optical fiber joining work is higher than that of conventional joining work using a V-groove base plate.

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