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1. 发明专利

JPH06281849A SUBMARINE OPTICAL CABLE 失效
公开(公告)号：JPH06281849A
公开(公告)日：1994-10-07
申请号：JP29800493
申请日：1993-11-29
申请人： NIPPON TELEGRAPH & TELEPHONE , OCEAN CABLE CO LTD
发明人： YOSHIZAWA NOBUYUKI , TANIFUJI TADATOSHI , ISHINO YASUO , IMAI TAKEYUKI , MOCHIZUKI AKIRA , NEMOTO KAZUMASA
IPC分类号： G02B6/44
摘要： PURPOSE:To provide the multiple coated optical fiber submarine cable which can be laid and drawn up to and from the deep sea, used extending over a long period in the deep sea and quickly repaired, and can be suppressed in induced Brillouin scattering. CONSTITUTION:The optical fiber submarine cable is constituted by containing a coated optical fiber 11 in a groove of a spacer 12 in which a groove is provided spirally on the surface in a state that an elongation strain of 0.05-0.2% remains, forming a cable by applying a water absorption tape 15 in contact with the outside periphery of the spacer 12 in order to prevent running of water in the cable and to prevent leading-in, assembling steel wires 16 on the outside periphery of this cable, and also, forming a pressure resisting shell by opplying a welded copper pipe 17, and moreover, applying polyethylene housing.

2. 发明专利

JP2013254923A LIGHT AMPLIFICATION DEVICE 审中-公开
公开(公告)号：JP2013254923A
公开(公告)日：2013-12-19
申请号：JP2012166312
申请日：2012-07-26
申请人： NIPPON TELEGRAPH & TELEPHONE
发明人： TAGUCHI KATSUHISA , FUJIWARA MASAMITSU , SUZUKI KENICHI , IMAI TAKEYUKI , ISHII HIROSHI
IPC分类号： H01S5/50 , H04B10/296
摘要： PROBLEM TO BE SOLVED: To provide a light amplification device which can restrain the pattern effect of a semiconductor optical amplifier (SOA).SOLUTION: A light amplification device 301 comprises an SOA 10 which amplifies signal light, a monitor unit 20 which monitors a signal light bit state, and a carrier density control unit 30 which exerts carrier synchronization control to have a carrier density level state in the SOA 10 synchronized to the signal light bit state monitored by the monitor unit 20. The light amplification device 301 controls carrier density accumulated in the SOA for each bit of signal light and thereby restrains a pattern effect which is generated when an optical signal having strong light intensity is amplified.

3. 发明专利

JPH10133240A LIGHT WAVELENGTH CONVERTER 失效
公开(公告)号：JPH10133240A
公开(公告)日：1998-05-22
申请号：JP28695696
申请日：1996-10-29
申请人： NIPPON TELEGRAPH & TELEPHONE
发明人： YAMAMOTO TAKASHI , IMAI TAKEYUKI , NAKAZAWA MASATAKA
IPC分类号： G02F1/35
摘要： PROBLEM TO BE SOLVED: To prevent the intensity of converted light from being reduced even at the time of changing the wavelength of excitation light within the range from the zero dispersion wavelength of an optical fiber up to the wavelength of an optical signal by setting the intensity of excitation light entered into an optical fiber to a specific value or more. SOLUTION: An optical fiber having the range of wavelength from optical signal wavelength λS up to short wavelength side zero dispersion wavelength λO is used as a four-light wave mixing medium (λO ΔκPP/4γ . In this case, γ=n2 ωP/cAett (where, n2 is a non-linear refractive index coefficient, ωP is the angular frequency of excitation light, c is light velocity, and Aett is set effective core cross section of an optical fiber). When the wavelength λP is changed within the range from the wavelength λO the wavelength λS (λO

4. 发明专利

JPH10145302A OPTICAL COMMUNICATION EQUIPMENT 失效
公开(公告)号：JPH10145302A
公开(公告)日：1998-05-29
申请号：JP29600096
申请日：1996-11-08
申请人： MITSUBISHI CABLE IND LTD , NIPPON TELEGRAPH & TELEPHONE
发明人： GENCHI TAKESHI , NAKAZAWA MASATAKA , IMAI TAKEYUKI
IPC分类号： G02B6/00 , H04B10/00 , H04B10/25 , H04B10/14 , H04B10/12 , H04B10/13 , H04B10/135
摘要： PROBLEM TO BE SOLVED: To provide the optical communication equipment that prevents a flooded state, while sufficiently securing a mechanical strength of a high tensile strength pipe and facilitates disassembling and re-assembling. SOLUTION: The optical communication equipment of in-line type is provided with a flexible high tensile strength pipe 3 that contains a block for mounting an optical communication component, a connection pipe 4 to which the end of an optical fiber cable 21 is inserted, while being fixed to each end of the high tensile strength pipe 3 and a connection block 6 to which a cable tensile strength body 21a of the optical fiber cable 21 is connected, while being contained in the inside of the connection pipe 4. The connection block 6 is fixed with a fastening screw 8, penetrating through the pipe wall of a connection pipe 4 in the broadwise direction via a water-proof sealing washer member 7 placed on an outer circumferential face of the connection pipe 4, and a water- proof sealing O-ring member 14 is interposed between an inner peripheral face of the connection pipe 4 and the outer peripheral face of the optical fiber cable 21.

5. 发明专利

JPH1022560A Q-SWITCH OPTICAL FIBER LASER 失效
公开(公告)号：JPH1022560A
公开(公告)日：1998-01-23
申请号：JP17208096
申请日：1996-07-02
申请人： NIPPON TELEGRAPH & TELEPHONE
发明人： IMAI TAKEYUKI , KOMUKAI TETSUO , NAKAZAWA MASATAKA
IPC分类号： H01S3/07 , H01S3/06 , H01S3/121
摘要： PROBLEM TO BE SOLVED: To provide a Q-switch optical fiber laser where a connection loss between elements constituting a laser resonator is small, structure is simple and the alignment of a space optical system is unnecessary. SOLUTION: In the laser resonator constituted of a rare earth added fiber 2 excited by an excitation light source 1 and optical fiber grating reflecting mirrors 10 and 11, stress is given to the reflecting mirror 11 by an oscillator 12 and it extends/contracts in a longitudinal direction. Thus, the period of a refraction factor change in the core of the optical fiber extends/contracts and the reflected wavelength of the optical fiber grating reflecting mirror 11 changes. The change of the reflected wavelength is set so that the reflected wavelength band of the optical fiber grating reflecting mirror 11 is periodically overlapped with the reflected wavelength band of the optical fiber grating reflecting mirror 10 by a high frequency power source 3 and a DC fiber power source 13.

6. 发明专利

JPH08334436A WAVELENGTH DISPERSION MEASURING METHOD FOR OPTICAL FIBER 失效
公开(公告)号：JPH08334436A
公开(公告)日：1996-12-17
申请号：JP14319795
申请日：1995-06-09
申请人： NIPPON TELEGRAPH & TELEPHONE
发明人： SAWARA AKIO , NAKAZAWA MASATAKA , IMAI TAKEYUKI
IPC分类号： G01M11/02
摘要： PURPOSE: To provide a wavelength dispersion measuring method for an optical fiber capable of being applied even to a fiber to be measured whose both ends have been installed in remote places. CONSTITUTION: Light rays emitted from a light source 3 are divided into a measuring light and a reference light by a beam slitter 4, and the reference light is introduced into a photodetector 5 as it is, and also the measuring light is made to enter one end 1a of a measurement objective fiber 1 through a photocirculator 8, and to propagate, and this is amplified by a bidirectional photoamplifier 9 provided on the other end 1b side, and is reflected by a total reflection mirror 10 so that the measurement objective fiber 1 is again propagated in the reverse direction, and the measuring light emitted from the one end 1a is introduced into a photodetector 6 through the photocirculator 8. The reference light and the measuring light after reciprocatedly propagated through the measurement object fiber 1 are transduced into an electric signal, and phase difference thereof is obtained by a phase difference meter 7, and further delay time is obtained. By repeating this procedure while changing the wavelength of light, wavelength dispersion is obtained.

7. 发明专利

JPH0659141A LARGE-INPUT OPTICAL CABLE 失效
公开(公告)号：JPH0659141A
公开(公告)日：1994-03-04
申请号：JP21047792
申请日：1992-08-06
申请人： NIPPON TELEGRAPH & TELEPHONE
发明人： YOSHIZAWA NOBUYUKI , TANIFUJI TADATOSHI , ISHINO YASUO , IMAI TAKEYUKI
IPC分类号： G02B6/00 , G02B6/02 , G02B6/10 , G02B6/16
摘要： PURPOSE:To provide the large-input optical cable which performs unrepeated transmission with a longer span than usual and has low loss and high reliability by rationally connecting optical fibers which differ in Brillouin shift frequency. CONSTITUTION:Lengthwise adjacent optical fibers of the optical cable constituted by connecting optical fibers which have a Brillouin shift frequency A (MHz) and Brillouin gain band half-value overall width 2B (MHz) roughly satisfy relations Ai-1+Bi+1 =Ai-1-Bi+1 (where i=1, 2, 3... show an (i)th fiber).

8. 发明专利

JP2001024367A HEAT DISSIPATING STRUCTURE OF HEAT GENERATION PART 失效
公开(公告)号：JP2001024367A
公开(公告)日：2001-01-26
申请号：JP18985499
申请日：1999-07-05
申请人： MITSUBISHI CABLE IND LTD , NIPPON TELEGRAPH & TELEPHONE
发明人： GENCHI TAKESHI , NAKAZAWA MASATAKA , IMAI TAKEYUKI
IPC分类号： H05K7/20
摘要： PROBLEM TO BE SOLVED: To enable heat generation parts to be inserted easily into a cylindrical member by forming a flat-plate where the heat generation parts touch at a heat transfer member and at the same time providing an arcuate plate in elastically contact with the inner surface of the cylindrical member. SOLUTION: A heat transfer member 3 is composed by a metal plate material, where one portion is set to a flat-plate 3a and the remainder is set to an arcuate plate 3b. Then, on the outer-periphery surface of the arcuate plate 3b, and a sheet-shaped head transfer later made of a pyrogenic conductive resin or gel is provided on the outer-periphery surface of the arcuate plate 3b. Also, in the arcuate plate 3b, length and curvature are set so that the part 3b is along the inner surface over the desired angle range of a cylindrical member 1. With this configuration, by inserting the heat transfer member 3 into the cylindrical member while its curvature is reduced slightly, heat generation parts and a parts-mounting block can be fitted, thus reducing resistance at an area to the inner surface of the cylindrical member 1 when the heat transfer member 3 is inserted and improving working efficiency.

9. 发明专利

JP2000028934A DISPERSION VARIABLE OPTICAL EQUALIZER 失效
公开(公告)号：JP2000028934A
公开(公告)日：2000-01-28
申请号：JP19579698
申请日：1998-07-10
申请人： NIPPON TELEGRAPH & TELEPHONE
发明人： KOMUKAI TETSUO , IMAI TAKEYUKI , NAKAZAWA MASATAKA
IPC分类号： G02B26/06 , G02F1/01 , H04B3/14 , H04B10/2507 , H04B10/2519 , H04B10/2525 , H04B10/02 , H04B10/18
摘要： PROBLEM TO BE SOLVED: To enable a dispersion quantity to be variable in a wide wavelength region equal to or higher than 1 nm by providing a tuning means changing the wavelength dispersion of a light transmitting a transmission type filter while shifting reflection wavelength regions of respective chirp fiber gratings equally in the same direction. SOLUTION: The longer wavelength side (shorter wavelength side) of a first (second) chirp grating 12 (14) is connected to the second port of a first (second) three ports type optical circulator 11 (13). Then, one transmission type filter is constituted by cascadingly connecting a second transmission type filter making the first and third ports the input and the output ports in random order. Next, the first and second chirp fiber gratings 12, 14 are adhered and fixed to a piezoelectric element 16. Then, the wavelength dispersion of the light transmitting the filter is made to be changed while shifting the reflection wavelength regions of respective first and second chirp fiber gratings 12, 14 equally in the same direction by applying a voltage to the element 16.

10. 发明专利

JPH10142430A HOUSING STRUCTURE OF OPTICAL FIBER AND HOUSING METHOD THEREFOR 失效
公开(公告)号：JPH10142430A
公开(公告)日：1998-05-29
申请号：JP29599996
申请日：1996-11-08
申请人： MITSUBISHI CABLE IND LTD , NIPPON TELEGRAPH & TELEPHONE
发明人： GENCHI TAKESHI , NAKAZAWA MASATAKA , IMAI TAKEYUKI
IPC分类号： G02B6/00
摘要： PROBLEM TO BE SOLVED: To provide a housing structure and a housing method of an optical fiber by which the optical fiber is not fixed, little layer for drawing is required and no consideration for a surface state is necessary. SOLUTION: The housing structure of the optical fiber is constituted of the optical fiber 13 drawn along an axial direction in a cylindrical tube 11 and plural block bodies 1 which are arranged along the axial direction in the cylindrical tube 11 by using parted from each other and in which the optical fiber 13 is housed. On outer surfaces along radial directions of respective block bodies 1, opening parts 2 through which the optical fiber 13 passes are formed. Further, at side edge parts of the outer surfaces along radial directions of respective block bodies 1, through-holes 3 which have width broader than the opening part 2, are communicated with the opening parts 2 and house the optical fiber 13 are formed. At outer periphery of the optical fiber 13 housed in the through-holes 3 of the respective block bodies 1 along radial direction thereof, thin plate shaped members 4 which close the opening parts 2 and are in contact with inner surfaces of the through-holes 3 are arranged.

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