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1. 发明专利

JPH07231305A LIGHT WAVELENGTH MULTIPLEX NETWORK 失效
公开(公告)号：JPH07231305A
公开(公告)日：1995-08-29
申请号：JP2050494
申请日：1994-02-17
申请人： TOSHIBA CORP
发明人： MANITSUSHIYU SHIYAAMA , ITO MASATAKA
IPC分类号： H04J14/00 , H04B10/27 , H04B10/275 , H04B10/291 , H04J14/02 , H04L12/42 , H04B10/20
摘要： PURPOSE:To provide a light wavelength multiplex network which facilitates maintenance and further can be realized at low cost. CONSTITUTION:This network is provided with a multi-wavelength light source 100 for transmitting the beams of different and plural wavelengths and a 1X2 directivity coupler 107 for splitting the beam transmitted from the multi- wavelength light source 100 into two optical fibers for each wavelength, and each of respective nodes 101-106 is provided with an ad-drop multiplexer 108 for pulling the beam of a prescribed wavelength into the node itself out of the beams of plural wavelengths transmitted through the optical fiber to be a main trunk line and for feeding the beam of the prescribed wavelength from the inside of that node into the optical fiber to be the main trunk line, light receivers 109 and 111 for receiving one part of the beam pulled in by the ad- drop multiplexer 108, and modulator 110 for modulating the beam which is pulled in by the ad-drop multiplexer 108 but not received by the optical receivers 109 and 111.

2. 发明专利

JPH10186149A OPTICAL FIBER, OPTICAL FIBER CABLE, PRODUCTION OF OPTICAL FIBER, OPTICAL FIBER CONNECTING PARTS, AND OPTICAL FIBER LAYING METHOD 失效
公开(公告)号：JPH10186149A
公开(公告)日：1998-07-14
申请号：JP34426296
申请日：1996-12-24
申请人： TOSHIBA CORP
发明人： KOBAYASHI HIROSHI , ITO MASATAKA , SUGAWARA MITSURU
IPC分类号： G02B6/36 , C03B37/027 , G02B6/00 , G02B6/02 , G02B6/10 , G02B6/28 , G02B6/30
摘要： PROBLEM TO BE SOLVED: To flexibly correspond to the increment of subscriber's nodes or their installation positions and to make it possible to construct an optical access type network system within a short period at a low cost without requiring highly advanced training. SOLUTION: The optical fiber is formed by covering the periphery of a linear core 20 with clad 21. The core 20 is provided with at least one of a reference core part 20a having prescribed reference aperture and a large aperture core part 20b having a shape capable of slowly increasing its aperture up to a prescribed maximum aperture while maintaining the transmission characteristic of a reference mode and slowly reducing the aperture up to the reference aperture. In the case of connecting the optical fiber having the constitution to another optical fiber or an element such as a light branching element, the large diameter core part 20b is cut off while maintaining a single mode characteristic and an end part formed by the cutting is used.

3. 发明专利

JPS63175807A PHOTODETECTOR 失效
公开(公告)号：JPS63175807A
公开(公告)日：1988-07-20
申请号：JP612787
申请日：1987-01-16
申请人： TOSHIBA CORP
发明人： ITO MASATAKA
IPC分类号： G02B6/122 , G02B6/12
摘要： PURPOSE:To surely receive demultiplexed optical signals without crosstalk by making intervals of one-side ends of light receiving parts different from those of the other-side ends in an integrated photodetector where plural light receiving parts are integrated on the same plane. CONSTITUTION:Integrated light receiving parts are arranged sectorally, and light receiving parts 1, 2 and 3 of the photodetector where three light receiving parts for three-wave multiplex transmission are integrated are arranged fanwise with a point S as the center, and intervals of light receiving parts are D1 in a position A, where optical signals of three waves are made incident, and are D2 in a position and are D3 in a position C. Though convergence intervals of optical signals emitted to the end face of a substrate are D2 on the design, they may be actually deviated from the design value D2 by IDELTAd because of the shape error of lens production, the production error of a diffraction grating, and the wavelength set error of a used light source. Since light receiving parts 1, 2, and 3 are integrated sectorally in accordance with D1=D2-DELTAd and D3=D2-DELTAd, optical signals are surely received even in case of deviation.

4. 发明专利

JPS6432501A MICROWAVE CIRCUIT DEVICE 失效
公开(公告)号：JPS6432501A
公开(公告)日：1989-02-02
申请号：JP18655987
申请日：1987-07-28
申请人： TOSHIBA CORP
发明人： ITO MASATAKA , SHIBAGAKI TARO , SHIMIZU FUMIHIKO
IPC分类号： H01L23/48 , H01L23/12 , H01P5/02 , H05K1/02 , H05K1/03 , H05K1/18
摘要： PURPOSE:To prevent the deterioration in the circuit characteristic due to the case such as mismatching of impedance or increase in pad capacitance by decreasing the dielectric constant of a dielectric board using an FET and increasing the part of the board using an IC. CONSTITUTION:The circuit characteristic is deteriorated in the circuit where microwave circuit components such as FETs and ICs exist in mixture because of the case such as mismatching of impedance or increase in pad capacitance. The pad capacitance is decreased by making the thickness of the dielectric material of the board with the FET mounted thereupon thick or employing a material with a lower dielectric constant, and the impedance mismatching is prevented by employing a material with a high dielectric constant (hatched part 2 of a board 1) or making the thickness (part 12 of a board 13) thin. Moreover, a dielectric substance having a ground plate on its upper face is coated around the parts of ground board with an IC mounted thereupon as the other way. Thus, a stable microwave circuit without the deterioration in the characteristic is obtained.

5. 发明专利

JPH103066A OPTICAL MODULATION DEVICE AND WAVELENGTH ADD-DROP MODULE 失效
公开(公告)号：JPH103066A
公开(公告)日：1998-01-06
申请号：JP15565296
申请日：1996-06-17
申请人： YAMASHITA SHINJI , HOTATE KAZUO , TOSHIBA CORP
发明人： YAMASHITA SHINJI , HOTATE KAZUO , ITO MASATAKA , SUGAWARA MITSURU
IPC分类号： G02F1/035 , H04B10/516 , H04B10/54 , H04B10/61 , H04B10/04 , H04B10/06 , H04B10/142 , H04B10/152
摘要： PROBLEM TO BE SOLVED: To stabilize the power level of an output light regardless of the polarized wave of an input light to an optical modulator even when an waveguide type optical modulator is used. SOLUTION: A Faraday rotator mirror 47 consisting of a 45 degree Faraday rotator 45 and a reflection mirror 46 is connected to the optical output port of a waveguide type optical modulator 44 to send back the optical signal from the modulator 44 while reflecting it and also the plane of polarized wave of the optical signal is made to be rotated by 90 degrees in the forward direction and reverse direction, and also an optical circulator 4 is connected to the optical input port of the modulator 44 and a modulated light is taken out from the port while inputting a non-modulated light to the port to be transmitted to an optical transmission line. Since the output optical signal of the modulator 44 is subjected to a TE-TM transformation by the Faraday rotator mirror 47 to be reinputted to the modulator 44, even when the transmissivity of the optical intensity modulator 44 is different in a TE polarized wave and in a TM polarized wave, the transmissivity of this device becomes the product between them and becomes the same transmissivity with respect to all polarized states.

6. 发明专利

JPH08248456A OPTICAL FIBER AMPLIFIER 失效
公开(公告)号：JPH08248456A
公开(公告)日：1996-09-27
申请号：JP5010395
申请日：1995-03-09
申请人： HOTATE KAZUO , YAMASHITA SHINJI , TOSHIBA CORP
发明人： HOTATE KAZUO , YAMASHITA SHINJI , ITO MASATAKA , SUGAWARA MITSURU , MANITSUSHIYU SHIYAAMA
IPC分类号： G02F1/35 , H01S3/06 , H01S3/067 , H01S3/07 , H01S3/23 , H04B10/2569 , H04B10/29 , H04B10/291
摘要： PURPOSE: To provide an optical fiber amplifier capable of stabilizing the polarization state of light signal output even if there is a fluctuation in the temp. or tension of an erbium-doped optical fiber(EDF). CONSTITUTION: This optical fiber amplifier includes an optical circulator 11 which outputs the light signal inputted from a first terminal P1 to a second terminal P2 and outputs the light signal inputted from this second terminal P2 to a third terminal P3, the EDF 12 which is connected at one end to the second terminal P2 of this optical circulator 11 and is excited by receiving exciting light to amplifier and output the input light signal, a reflection mirror 14 which is connected at the other end of the EDF 12 and reflects and sends back the light signal from the EDF 12, an LD light source 15 for excitation which generates the exciting light to the EDF 12 and an optical coupler 13 which introduces the exciting light from this light source 15 to the EDF 12. A suitable torsion is applied to the EDF 12 in such a manner that the EDF has a circularly polarized light maintaining characteristic.

7. 发明专利

JPH0846223A MODULE FOR OPTICAL PARALLEL TRANSMISSION 失效
公开(公告)号：JPH0846223A
公开(公告)日：1996-02-16
申请号：JP17893694
申请日：1994-07-29
申请人： TOSHIBA CORP
发明人： ITO MASATAKA
IPC分类号： H01L27/14 , H01L27/144 , H01L31/02 , H04B10/00 , H04B10/2507
摘要： PURPOSE:To provide a module for optical parallel transmission, in which the dispersion of characteristics due to the difference of isolation characteristics between channels and signal wiring line length can be reduced and which enables transmission having excellent quality. CONSTITUTION:In a module for optical parallel transmission conducting the parallel transmission of optical signals by using a plurality of optical fibers, a plurality of photodetectors receiving a plurality of optical signals transmitted from a plurality of the optical fibers are arranged in parallel, a photodetector array 6, in which electrodes for extracting the optoelectric converted electric signals of each photodetector are extended toward the mutually opposite directions in the mutual adjacent photodetectors, is loaded on a substrate 1, and signal wiring lines 71-78 on the substrate can be connected alternately from both sides of the photodetector array 6 at the time of loading on the substrate.

8. 发明专利

JPH0818538A OPTICAL WAVELENGTH MULTIPLX NETWORK SYSTEM 失效
公开(公告)号：JPH0818538A
公开(公告)日：1996-01-19
申请号：JP14355994
申请日：1994-06-24
申请人： TOSHIBA CORP
发明人： MANITSUSHIYU SHIYAAMA , ITO MASATAKA
IPC分类号： G02F1/125 , G02F1/00 , H04B10/032 , H04B10/038 , H04B10/079 , H04B10/2507 , H04B10/2587 , H04B10/27 , H04B10/275 , H04B10/291 , H04J1/00 , H04J14/00 , H04J14/02 , H04B10/20
摘要： PURPOSE:To facilitate stability control of a light source by concentrating light sources of terminal nodes. CONSTITUTION:A central node CN generates a transmission wavelength light of each terminal node LN#k by a multi-wavelength light source OG, a multiplexer MUX1 multiplexes the lights and the result is fed to an optical fiber ring FR. On the other hand, the light from the FR is demultiplexed for each wavelength at a demultiplexer DEMUX, converted into an electric signal by a converter O/E and exchanged by an exchange switch SW for each destination, converted into an allocated wavelength light at the converter E/O, multiplexed by a multiplexer MUX2 and the result is sent to the FR. A demultiplexer DEMUX of a terminal node LN#k demultiplexes the transmission wavelength light and the reception wavelength light allocated to the node from the FR and a demultiplexer WDM demultiplexes the transmission wavelength light and the reception wavelength light, the optical receiver RX receives the reception wavelength light and an optical modulator MOD modulates the transmission wavelength light by a transmission signal and the multiplexer MUX multiplexes the modulation light with an undemultiplexed light and the result is fed to the FR.

9. 发明专利

JPH06252518A GENERATOR OF LIGHT OF DIFFERENT WAVELENGTHS AND OPTICAL TRANSMITTER OF MULTIPLEX TRANSMISSION 失效
公开(公告)号：JPH06252518A
公开(公告)日：1994-09-09
申请号：JP3718893
申请日：1993-02-26
申请人： TOSHIBA CORP
发明人： ITO MASATAKA , IBE HIROYUKI
IPC分类号： H01S3/108 , H01S3/06 , H01S3/30
摘要： PURPOSE:To propagate multiplex transmission light by taking out light of a plurality of wavelengths through a stimulated Brillouin light generator from a single light source. CONSTITUTION:Light emitted by a light source 11 is divided into two rays of light by a photocoupler 12-1, while one ray is modulated by an external modulator 15-1 to become a first transmission ray of light. The other ray is amplified by an optical amplifier 13 and enters an optical fiber 14 to generate light by the stimulated Brillouin effect. The light is taken out by a photocoupler 12-2, inputted into an external modulator 15-2, modulated, and becomes a second ray of transmission light. Finally, the first and the second rays of transmission light are coupled in a photocoupler 12-3 to become multiplex transmission light.

10. 发明专利

JPS61287264A PHOTOSEMICONDUCTOR DEVICE 失效
公开(公告)号：JPS61287264A
公开(公告)日：1986-12-17
申请号：JP12826685
申请日：1985-06-14
申请人： TOSHIBA CORP
发明人： ITO MASATAKA , AKUMI TAKEHIKO
IPC分类号： G02B6/42 , H01L27/15 , H01S5/00
摘要： PURPOSE:To optimally couple readily a semiconductor laser with photowaveguide by burying the photowaveguide in a substrate surface layer when forming the photowaveguide in the substrate as a photosemiconductor element, forming an etched recess for engaging the laser with the end of the photowaveguide, burying the laser and coupling it with the photowaveguide. CONSTITUTION:Titanium is diffused in the surface layer of a substrate 12 made of lithium niobate to form a photowaveguide 11, an etched recess 14 is opened by etching in the substrate 12, and electrode wirings 18 are laid on the bottom. At this time, the size of the recess 17 is formed in the same as that of a semi conductor laser 13 of a stripe 15, and the electrode 15 of the stripe 15 side is disposed at the downside and buried in the recess 17. Thereafter, a driver IC element 19 formed on the temporarily extended line of the photowaveguide 11 is connected with the laser 13 by electrode wirings 18 as a photo semiconductor device. Thus, the photowaveguide 11 and the laser 13 are positioned only by deciding the etching accuracy of the recess 17 to optically couple them and to improve the productivity.

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