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1. 发明专利

JPH08254630A OPTICAL WAVEGUIDE MODULE AND ITS PRODUCTION 失效
公开(公告)号：JPH08254630A
公开(公告)日：1996-10-01
申请号：JP5834895
申请日：1995-03-17
申请人： NIPPON TELEGRAPH & TELEPHONE
发明人： KIHARA MITSURU , NAGASAWA SHINJI , TANIFUJI TADATOSHI , TAKATANI MASAAKI
IPC分类号： G02B6/30
摘要： PURPOSE: To provide an optical waveguide module with which highly accurate coupling is possible without alignment. CONSTITUTION: This optical waveguide module consists of the structure provided with an optical waveguide 4 provided with optical waveguide cores and an optical coupling member 5 having guide holes to allow the freely attachable and detachable insertion of guide pins 6 for connection respectively at both ends of this optical waveguide chip 4. The dimensional positions of the optical waveguide cores and guide holes of the optical waveguide chip 4 are parted at a specified spacing. The production of the module is executed by first simultaneously forming the optical waveguide cores and markers on the main surface of a substrate, then cutting the substrate for forming the optical waveguide chip on the basis of these markers and forming the two surfaces of the optical waveguide chip as reference planes for molding. The substrate is then positioned via the reference planes for molding to metal molds and pins for forming the guide holes are positioned to the metal molds. The optical coupling member 5 is formed by executing molding. The pins for forming the guide holes are removed from the optical coupling member 5 to form the guide holes to be inserted with the guide pins 6 for connection, by which the module is produced.

2. 发明专利

JPH0735931A OPTICAL FUNCTIONAL COMPONENT AND MANUFACTURE THEREOF 失效
公开(公告)号：JPH0735931A
公开(公告)日：1995-02-07
申请号：JP18013793
申请日：1993-07-21
申请人： SUMITOMO ELECTRIC INDUSTRIES , NIPPON TELEGRAPH & TELEPHONE
发明人： IWASHIMA TORU , SAITO KAZUTO , YAMANISHI TORU , TANIFUJI TADATOSHI
IPC分类号： G02B3/00 , G02B6/00 , G02B6/04 , G02B6/24
摘要： PURPOSE:To provide the structure and manufacture of an optical functional component capable of integrating the optical functional component comprised in transmission line unit. CONSTITUTION:The optical functional component can be comprised by using fiber arrays 4a, 4b on which nXm fibers are arranged at prescribed pitch, and holding one or two or more optical elements 1 between plane lens arrays 2a, 2b on which plane lenses which collimate by converging outgoing light from each fiber are arranged at the terminal parts 3a, 3b of the fiber arrays.

3. 发明专利

JPH01147410A FLUSH TYPE OPTICAL WAVEGUIDE 失效
公开(公告)号：JPH01147410A
公开(公告)日：1989-06-09
申请号：JP30535587
申请日：1987-12-02
申请人： FURUKAWA ELECTRIC CO LTD , NIPPON TELEGRAPH & TELEPHONE
发明人： YANAGAWA HISAHARU , KAMATA YOSHIYUKI , UEKI TAKESHI , MIYAZAWA HIDEHISA , TANIFUJI TADATOSHI , MATSUURA MASAAKI , NAKAMOTO HIROSHI
IPC分类号： G02B6/122 , G02B6/12
摘要： PURPOSE:To suppress the scattering loss of both corner parts of the upper part of a core and to improve the transmission characteristic by forming a buffer layer between the core and the upper clad. CONSTITUTION:On a substrate 11, the lower buffer layer 12, the lower clad 13, a core 14 and a buffer layer 15 are formed in this order, and also, both side faces of the core 14 and the upper face of the buffer layer 15 are covered with the upper clad 16. Also, a relation of a refractive index n1 of the core 14, a refractive index n2 of the lower clad 13, a refractive index n3 of the upper clad 16 and a refractive index n4 of the buffer layer 15 is set to n1>n2, n1>n3, and n1>n4. In such a way, since the buffer layer 15 is formed between the core 14 and the upper clad 16, no scattering loss is generated in both corner parts 14a, 14b of the upper part of the core 14, and the transmission characteristic is improved.

4. 发明专利

JPS63198427A METHOD FOR CONSTITUTING OPTICAL TRANSMISSION SYSTEM 失效
公开(公告)号：JPS63198427A
公开(公告)日：1988-08-17
申请号：JP2985987
申请日：1987-02-13
申请人： NIPPON TELEGRAPH & TELEPHONE
发明人： MATSUURA MASAAKI , HARADA MASAHARU , TANIFUJI TADATOSHI , NAKAMOTO HIROSHI
IPC分类号： H04J14/00 , H04B10/00 , H04B10/25 , H04J14/02
摘要： PURPOSE:To attain the wavelength multiplex transmission in an excellent way by using a light source single mode optical fiber whose effective cut-off wavelength is within the specified value and where the LP2 and LP21 modes with respect to the light source wavelength are cut off and using a short wave length light source. CONSTITUTION:An optical transmission line is constituted by connecting plural pieces of optical transmission line single mode optical fibers 3A-3D. One end of the light source module single mode optical fiber 2 is coupled optically with a light source element in a light source module 1 and the other end is coupled optically with the end of the fiber 3A. As the optical fiber 2, a single mode optical fiber is used, which satisfies the existing standards and whose LP02 and LP21 modes are effectively cut off. Thus, the presence of the LP02 and LP21 modes in the fiber 2 is blocked and the wavelength multiplex transmission using the light source of a shorter wavelength than the substantially applied wavelength is excellently attained.

5. 发明专利

JPS6364005A OPTICAL STAR COUPLER 失效
公开(公告)号：JPS6364005A
公开(公告)日：1988-03-22
申请号：JP20770386
申请日：1986-09-05
申请人： NIPPON TELEGRAPH & TELEPHONE
发明人： TANIFUJI TADATOSHI
IPC分类号： G02B6/122 , G02B6/12 , G02B6/28
摘要： PURPOSE:To enable the application of semiconductor production process technology and to obtain an inexpensive and small-sized optical star coupler by applying the concave lens effect of a waveguide for which the photoelastic effect of a semiconductor is utilized as a waveguide to constitute the optical star coupler. CONSTITUTION:GaAs doped with about 10 cm n-type impurity is used as a semiconductor substrate 5 and high-purity GaAs is used as a thin semiconductor film 6. The refractive index of the part of the thin film 6 is larger than the refractive index of the substrate 6 and an effect of confining light in the direction perpendicular to the substrate 5 is generated if photon energy is =0.886mum wavelength). The three-dimensional waveguide is thus formed. Incident signals from respective ports join together and pass a mode mixing part 9. The signals past the mixing part 9 are, therefore, guided to then peripheral part as well by the concave lens effect of a branching and confluent part 10 and the uneven branching is decreased in the waveguide mounted with the thin SiO2 film. Since the semiconductor production process is applicable to such production, the mass production and the cost reduction are feasible.

6. 发明专利

JPS6218882B2 失效
公开(公告)号：JPS6218882B2
公开(公告)日：1987-04-24
申请号：JP20369582
申请日：1982-11-22
申请人： NIPPON TELEGRAPH & TELEPHONE
发明人： KATO YASUYUKI , TANIFUJI TADATOSHI , TOKUDA MASAMITSU , NAGASAWA TADASHI
IPC分类号： G02B6/24 , G02B6/255

7. 发明专利

JPS5653439A MEASURING DEVICE FOR CHARACTERISTIC OF WAVELENGTH OF OPTICAL LOSS 失效
公开(公告)号：JPS5653439A
公开(公告)日：1981-05-13
申请号：JP12949479
申请日：1979-10-09
申请人： NIPPON TELEGRAPH & TELEPHONE
发明人： TANIFUJI TADATOSHI , TOKUDA MASAMITSU , HORIGUCHI TSUNEO
IPC分类号： G01M11/02 , G01M11/00 , G01N21/27
摘要： PURPOSE:To widen the dynamic range and improve the precision of measurement by a method wherein light sources having different wavelength are modulated with different modulation frequencies, the beams thus modulated are received selectively by a photoreceiver through a phototransmitting medium such as a photofiber to be measured and an optical IC and thus the optical loss of the medium is measured. CONSTITUTION:Light sources 2 having different wavelength, such as diode lasers and LEDs, are modulated by oscillators 1 whose frequencies range f1-fn, and the beams therefrom are passed through opaque mirrors 2, transformed into a monochromatic beam by a diffraction grating 13 and passed into the photofiber to be measured through a rod lens 4 and a connector. The half-transparent millors 2 have such characteristics as showing large transmittance to the aimed wavelength while reflecting the beams of other wavelength. The beam coming out from the photofiber 7 is received by a photoreceiver and the level of transmittance thereof is indicated on a level indicator through the intermediary of a preamplifier, a variable band-pass filter and a low-frequency detector. By this constitution, it becomes possible to widen the dynamic range and perform the measurement with high precision in the optical loss.

8. 发明专利

JPS5381137A REDUCING METHOD FOR WAVELENGTH DISPERSION EFFECT IN OPTICAL FIBER TRANSMISSION SYSTEM 失效
公开(公告)号：JPS5381137A
公开(公告)日：1978-07-18
申请号：JP15633176
申请日：1976-12-27
申请人： NIPPON TELEGRAPH & TELEPHONE
发明人： IKEDA MASAHIRO , TANIFUJI TADATOSHI
IPC分类号： H04B10/2507 , G02B6/00 , G02B6/26 , G02B6/34 , H04B10/00 , H04B10/2513
摘要： PURPOSE:To reduce wavelength dispersion effect owing to distance and make possible wide range and long distance transmission by performing mixing of light of varyign wavelengths with a photomixing element.

9. 发明专利

JPH085873A OPTICAL FUNCTION PARTS AND THEIR PRODUCTION 失效
公开(公告)号：JPH085873A
公开(公告)日：1996-01-12
申请号：JP13319894
申请日：1994-06-15
申请人： SUMITOMO ELECTRIC INDUSTRIES , NIPPON TELEGRAPH & TELEPHONE
发明人： SAITO KAZUTO , IWASHIMA TORU , YAMANISHI TORU , TANIFUJI TADATOSHI
IPC分类号： G02B6/32 , G02B6/42
摘要： PURPOSE:To obtain optical function parts capable of easily align a lens array and an optical element, simplifying stages and reducing a cost by pressing the other end face of an optical prism provided with an optical element on one end face to the lens array. CONSTITUTION:These optical function parts have the lens array 3 which is mounted at the end of the fiber array 1 one-dimensionally or two-dimensionally arranged with optical fibers and is arranged with lenses acting on the incident or exit light of the respective optical fibers in correspondence to the respective optical fibers. The parts have also the optical prism 6 which has an end face 9 and an end face 7 exactly formed with a relative position to the end face 9 and of which the end face 9 is pressed to the lens array 3 and a filter 8 which is arranged on the end face 7. The other end face 9 of the optical prism 6 provided with the optical element (filter 8) on the one end face 7 is pressed to the lens array 3, by which the relative position of the optical element with the lens array 3 is exactly held.

10. 发明专利

JPH04310027A SWITCHING METHOD FOR OPTICAL LINE 失效
公开(公告)号：JPH04310027A
公开(公告)日：1992-11-02
申请号：JP7539591
申请日：1991-04-08
申请人： NIPPON TELEGRAPH & TELEPHONE
发明人： TANIFUJI TADATOSHI , KAWASE MASAAKI
IPC分类号： G02B6/00 , H04B10/03 , H04B10/032 , H04B10/077 , H04B10/272
摘要： PURPOSE:To attain high reliability of a line network and to save man-hour for the maintenance. CONSTITUTION:An photocoupler 12 terminating an active core wire 4 and q standby core wire 5 is provided in the method and when the active core wire or a cable between a center and a user is faulty or the cable is transferred due to a fault, only an optical switch 1 arranged to the center is driven and the active core wire is switched to the standby core wire.

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