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71. 发明专利

JP2001203638A OPTICAL MULTIPLEXING CIRCUIT 失效
公开(公告)号：JP2001203638A
公开(公告)日：2001-07-27
申请号：JP2000013486
申请日：2000-01-21
申请人： MITSUBISHI ELECTRIC CORP
发明人： ISHIDA KAZUYUKI , SHIMIZU KATSUHIRO
IPC分类号： H04B10/27 , G02B6/293 , H04B10/07 , H04B10/2563 , H04B10/29 , H04J14/00 , H04J14/04 , H04J14/06 , H04B10/02
摘要： PROBLEM TO BE SOLVED: To obtain an optical multiplexing circuit that can realize expansion of a transmission capacity and improvement of wavelength multiplex density with an inexpensive configuration while suppressing an FWM. SOLUTION: By applying polarization orthogonal processing to optical signals with a plurality of different wavelengths, multiplexed polarization multiplex light beams are formed into one block, an optical multiplexer 6a receives and multiplexes a plurality of blocks of polarized multiplexed light beams, transmits the polarized multiplex light beams through optical fibers 5a, 5b and 5c of a polarized wave non-conservative type and each optical signal is arranged so that the wavelength interval between blocks is greater than the wavelength interval of the optical signals in each block.

72. 发明专利

JP2001027746A OPTICAL TRANSMITTER AND OPTO-ELECTRIC CIRCUIT 失效
公开(公告)号：JP2001027746A
公开(公告)日：2001-01-30
申请号：JP20020999
申请日：1999-07-14
申请人： MITSUBISHI ELECTRIC CORP
发明人： KANESHIRO KAORU , SHIMIZU KATSUHIRO
IPC分类号： G02F1/035
摘要： PROBLEM TO BE SOLVED: To make it possible to automatically execute control in such a manner that an optical extinction ratio may be obtained with simple constitution and to make it possible to obtain always constant output light by providing the above device with a peak detector, bias setting means for setting bias voltage in accordance with the output signal from the peak detector, etc. SOLUTION: The light signal outputted from a second output terminal 15b of an external optical modulator 2 is shifted in light frequency by a frequency shifter 9 and is delayed in an optical delay device 10, following which this signal is multiplexed with the light signal from a first demultiplexer/multiplexer 3a and is converted to an electric signal from the light signal in a PD 4 to generate a beat signal. This beat signal is amplified in a preamplifier 5 and is then selectively transmitted through a BPF 6 and is peak detected by the peak detector 7. The output signal from the peak detector 7 is sent to a bias setting circuit 8. The intensity of this output signal is always detected and the bias voltage to be impressed to the external optical modulator 2 is so set that the output intensity is set always at the minimum value.

73. 发明专利

JP2000252920A OPTICAL EQUALIZER 失效
公开(公告)号：JP2000252920A
公开(公告)日：2000-09-14
申请号：JP4778599
申请日：1999-02-25
申请人： MITSUBISHI ELECTRIC CORP
发明人： SHIMIZU KATSUHIRO , SUGIHARA TAKASHI
IPC分类号： G02B6/02 , G02B6/10 , H04B3/04 , H04B10/2507 , H04B10/2519 , H04B10/2525 , H04B10/02 , H04B10/18
摘要： PROBLEM TO BE SOLVED: To generate dispersion by applying temperature gradient and to change variance into a desired value by providing a temperature gradient applying means which a applies a temperature gradient in the optical signal propagation direction of an optical waveguide having a diffraction grating. SOLUTION: Temperature applying means 5a and 5b apply heat to an optical waveguide 1. In such a case, thermal gradient is generated on the waveguide 1 and a diffraction grating 2 by making the heat value generated by the means 5a different from the heat value generated by the means 5b. Since the refraction factor of the waveguide 1 is a function of temperature, the equivalent refraction factor Neff of the grating 2 also becomes a function of temperature. Thermal gradient applied by the means 5a and 5b is led to a distribution of a waveguide longitudinal direction to the factor Neff, too. Then, an effect being the same as a chirped grating is generated by the thermal gradient, and when wavelength is different, a distance to a reflection point is different to generate dispersion. Dispersion quantity to be generated is changed by changing thermal gradient applied to the grating 2 in this way.

74. 发明专利

JPH1048582A MODULATION DEVICE, TRANSMISSION DEVICE, MODULATION METHOD, AND COMMUNICATION SYSTEM 失效
公开(公告)号：JPH1048582A
公开(公告)日：1998-02-20
申请号：JP20965096
申请日：1996-08-08
申请人： MITSUBISHI ELECTRIC CORP
发明人： SHIMIZU KATSUHIRO , MIZUOCHI TAKASHI , KITAYAMA TADAYOSHI
IPC分类号： G02F1/03 , G02F1/01 , H04B10/071 , H04B10/077 , H04B10/079 , H04B10/508 , H04B10/516 , H04B10/524 , H04B10/54 , H04B10/556 , H04B10/61 , H04B10/04 , H04B10/06 , H04B10/142 , H04B10/152
摘要： PROBLEM TO BE SOLVED: To achieve an optical modulation device capable of suppressing deterioration of transmission signal in quality caused by drift of a working point of a modulation device, by adding dither signal on a bias voltage of an optical modulation device. SOLUTION: This optical modulation device comprises a source of light 1, an optical modulator 3, a modulator driving circuit 24, a dither signal generator 12, a peak detector 15 for detecting a low frequency dither signal from output signal, a synchronous detection circuit 7 for detecting synchronization of the dither signal generated from the low frequency and dither signal generator detected in the peak detector 15, and a bias circuit 10 for controlling a bias applied to the optical modulator 3 according to the result of the synchronization detection by the synchronous detection circuit 7. And, adding a low frequency signal on the bias makes it easily possible to control the operation of the modulator even in modulating a high frequency signal.

75. 发明专利

JPH09211509A OPTICAL RECEIVER 失效
公开(公告)号：JPH09211509A
公开(公告)日：1997-08-15
申请号：JP1570196
申请日：1996-01-31
申请人： MITSUBISHI ELECTRIC CORP
发明人： SHIMIZU KATSUHIRO , KITAYAMA TADAYOSHI
IPC分类号： G02B6/00 , G02F1/35 , H04B10/03 , H04B10/079 , H04B10/2507 , H04B10/2519 , H04B10/40 , H04B10/50 , H04B10/508 , H04B10/524 , H04B10/564 , H04B10/58 , H04B10/60 , H04B10/67 , H04B10/69 , H04B10/02 , H04B10/04 , H04B10/06 , H04B10/14 , H04B10/18 , H04B10/26 , H04B10/28
摘要： PROBLEM TO BE SOLVED: To obtain an optical receiver with which S/N is attained by solving the problem that the S/N is restricted by the band of an optical filter. SOLUTION: This optical receiver is composed of an optical gate 3 which is disposed on a signal input end 1 side, a high dispersion medium 4 which is connected to the output side of this optical gate 3, a receiver 7 which reproduces data and clock from a photodetector 6 connected to the high dispersion medium 4 output side and a phase shifter 10 which controls the gate time of the optical gate from the clock of this receiver 7. A peak detecting means for detecting the peak value of the clock of the output of the receiver 7 is added to the optical receiver by using a waveguide grating filter as the high dispersion medium 4 and the time of the optical gate 3 is so controlled as to maximize the peak value of the clock.

76. 发明专利

JPH07123056A OPTICAL AMPLIFIER, DISTRIBUTION SYSTEM, LOCAL AREA NETWORK AND GAIN CONTROL METHOD 失效
公开(公告)号：JPH07123056A
公开(公告)日：1995-05-12
申请号：JP26662393
申请日：1993-10-25
申请人： MITSUBISHI ELECTRIC CORP
发明人： SHIMIZU KATSUHIRO , MIZUOCHI TAKASHI , MOTOJIMA KUNIAKI , KITAYAMA TADAYOSHI
IPC分类号： G02F1/35 , H01S3/094 , H01S3/13 , H04B10/07 , H04B10/293 , H04B10/294 , H04B10/564 , H04B10/572 , H04J14/00 , H04J14/02 , H04B10/14 , H04B10/04 , H04B10/06
摘要： PURPOSE:To suppress the deterioration in the characteristic and in the gain even with a wide input signal range by providing a compensation light source, injecting a compensation light in a reverse direction to that of a signal light, and detecting a spontaneous emission level so as to control the compensation light. CONSTITUTION:An input signal from an input terminal 1 is amplified by a rare-earth group added fiber 3 via an isolator 7a and a coupler 4a. The fiber 3 produces a spontaneous emission light propagated in the same direction as and the reverse direction to the signal propagation direction. The spontaneous emission light propagated in the reverse direction to the signal propagation direction is detected by a photodetector 10 via the coupler 4a and an optical filter 9. A compensation light source drive circuit 12a controls a compensation light source 11 so that the detected spontaneous emission light intensity is constant thereby making the total intensity of an input signal light and the compensation light source output light constant independently of the input signal. When the total intensity is constant, the gain and noise characteristic of an optical amplifier is constant to make the gain stable. Furthermore, the compensation light source output light is blocked by the isolator 7a, then leakage at the outside of the optical amplifier affecting no other equipments.

77. 发明专利

JPH06331495A DEVICE AND METHOD FOR MEASURING ZERO DISPERSION WAVELENGTH 失效
公开(公告)号：JPH06331495A
公开(公告)日：1994-12-02
申请号：JP11595693
申请日：1993-05-18
申请人： MITSUBISHI ELECTRIC CORP
发明人： SHIMIZU KATSUHIRO , SHIMOMURA KENKICHI , MIZUOCHI TAKASHI , KITAYAMA TADAYOSHI
IPC分类号： G01M11/02
摘要： PURPOSE:To obtain a zero dispersion wavelength measuring device and method which can accurately measure the zero dispersion wavelength of an optical waveguide path such as an optical fiber. CONSTITUTION:The polarization surface of light output from a reference light source 1 and a wavelength variable light source 2 is aligned by a polarization controller 3, is multiplexed by an optical multiplexer 4, and then is input to an optical fiber 5 to be measured. Four light wave mixing light power generated by the optical fiber 5 to be measured is measured by a light spectrum analyzer 6. The four light wave mixing light power reaches it maximum when the oscillation wavelength of the wavelength variable light source 2 matches the zero dispersion wavelength of the optical fiber 5 to be measured. Therefore, by sweeping the oscillation wavelength of the wavelength variable light source 2 and then measuring the oscillation wavelength of the wavelength variable light source 2 where the four light wave mixing light power indicates the maximum, the zero dispersion wavelength of the optical waveguide such as the optical fiber can be measured accurately.

78. 发明专利

JPH05136495A FIBERTYPE OPTICAL AMPLIFIER 失效
公开(公告)号：JPH05136495A
公开(公告)日：1993-06-01
申请号：JP29286591
申请日：1991-11-08
申请人： MITSUBISHI ELECTRIC CORP
发明人： SHIMIZU KATSUHIRO , MIZUOCHI TAKASHI , MATSUSHITA KIWAMU , KITAYAMA TADAYOSHI
IPC分类号： H01S3/07 , H01S3/06 , H01S3/0915 , H01S3/0933 , H01S3/10
摘要： PURPOSE:To stabilize the excitation light levels of a fiber type optical amplifier having redundant structure by which excitation lights outputted by two excitation light sources having two amplifying mediums and two excitation light sources are synthesized, and then divided into two and put into the two amplifying mediums. CONSTITUTION:Excitation light waves outputted by excitation light sources 2a and 2b are polarized by wave polarization controllers 12a and 12b, and they are put into a wave sypthesizer and divider 8 in a polarized state meeting at a right angle with each other. After the polarization and synthesis, they are distributed and put into rare-earth doped optical fibers 1a and 1b through wavelength multiple wave-synthesizers and dividers 3a and 5b. Consequently, it becomes possible to constitute a fiber type optical amplifier without level variations by the synthesis of the two excitation lights.

79. 发明专利

JP2010041493A Multiplex circuit 审中-公开
标题翻译：多路复用电路
公开(公告)号：JP2010041493A
公开(公告)日：2010-02-18
申请号：JP2008203204
申请日：2008-08-06
申请人： Mitsubishi Electric Corp , 三菱電機株式会社
发明人： KOBAYASHI TATSUYA , SHIMIZU KATSUHIRO
IPC分类号： H04J3/04
摘要： PROBLEM TO BE SOLVED: To provide a multiplex circuit that outputs a multiplex signal without depending on duty of a clock signal.
SOLUTION: The multiplex circuit to which two-system data signals (D1, D2) and a clock signal C1 are input includes: a clock generating portion 5 for generating a clock signal C2 whose frequency is 1/2 that of the clock signal C1 and a clock signal C3 where a phase of the clock signal C2 is delayed by π/2, a first retiming portion 1 for retiming a data signal D1 by the clock signal C2, a second retiming portion 2 for retiming a data signal D2 by the clock signal C2, a delay portion 3 for delaying output data of the second retiming portion 2, a multiplex portion 4 for alternately outputting the output data of the first retiming portion 1 and those of the delay portion 3, and a wave shaping portion 6 for shaping the output wave of the multiplex portion 4 by the clock signal C1.
COPYRIGHT: (C)2010,JPO&INPIT
摘要翻译：要解决的问题：提供一种多路复用电路，其输出多路复用信号而不依赖于时钟信号的占空比。解决方案：输入双系数据信号（D1，D2）和时钟信号C1的复用电路包括：时钟产生部分5，用于产生频率为时钟频率的1/2的时钟信号C2 信号C1和时钟信号C2的相位延迟π/ 2的时钟信号C3，用于将数据信号D1重新定时的时钟信号C2的第一重新定时部分1，用于重新定时数据信号D2的第二重定时部分2 通过时钟信号C2，延迟第二重定时部分2的输出数据的延迟部分3，用于交替地输出第一重定时部分1和延迟部分3的输出数据的多路复用部分4和波形整形部分 6，用于通过时钟信号C1对复用部分4的输出波进行整形。版权所有（C）2010，JPO＆INPIT

80. 发明专利

JP2010004410A Excitation light source device, optical relay apparatus and optical transmission system 有权
标题翻译：激光光源装置，光电继电器和光传输系统
公开(公告)号：JP2010004410A
公开(公告)日：2010-01-07
申请号：JP2008162563
申请日：2008-06-20
申请人： Mitsubishi Electric Corp , 三菱電機株式会社
发明人： TOKURA TOSHIYUKI , SHIMIZU KATSUHIRO , ISHIDA KAZUYUKI , SUGIHARA TAKASHI , MITANI SHUNSUKE
IPC分类号： H04B10/07 , H01S3/00 , H01S3/06 , H01S3/067 , H01S3/091 , H01S3/102 , H04B10/077 , H04B10/079 , H04B10/29 , H04B10/296
摘要： PROBLEM TO BE SOLVED: To obtain an excitation light source device which highly accurately perform fault detection on a transmission line and reduces an output level of Raman excitation light in the case that a fault occurs. SOLUTION: The present invention relates to an excitation light source device which is positioned on a transmission line of an optical transmission system for transmitting signal light and OSC light for information transmission, outputs Raman excitation light for amplifying signal light to the transmission line, and includes: an OSC light level monitor (9) for detecting a level of the OSC light; a main signal light level monitor (6) for detecting a level of the signal light; and a control section (2) which determines the presence/absence of a fault on the transmission line on the basis of results of the level detection from the OSC light level monitor (9) and the main signal level monitor (6) and controls to the level of the Raman excitation light rather than a normal level in the case that the presence of the fault is determined. COPYRIGHT: (C)2010,JPO&INPIT
摘要翻译：要解决的问题：为了获得在发生故障的情况下高精度地执行传输线路故障检测并降低拉曼激发光的输出电平的激发光源装置。解决方案：本发明涉及一种位于传输信号光的光传输系统和用于信息传输的OSC光的传输线上的激发光源装置，输出用于将信号光放大到传输线的拉曼激发光并且包括：用于检测OSC光的电平的OSC光级监视器（9）主信号光电平监视器（6），用于检测信号光的电平; 以及控制部分（2），其基于来自OSC光级监视器（9）和主信号电平监视器（6）的电平检测结果来确定传输线上的故障的存在/不存在，并且控制到在确定故障的存在的情况下，拉曼激发光的电平而不是正常电平。版权所有（C）2010，JPO＆INPIT

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