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1. 发明专利

JP2003051791A Optical amplifier 有权
标题翻译：光放大器
公开(公告)号：JP2003051791A
公开(公告)日：2003-02-21
申请号：JP2001239707
申请日：2001-08-07
申请人： Mitsubishi Electric Corp , 三菱電機株式会社
发明人： ISSHIKI KUNIHIKO , KOGURE TAICHI , MOTOJIMA KUNIAKI
IPC分类号： H01S3/06 , H01S3/067 , H01S3/094 , H01S3/0941 , H01S3/10 , H04B10/07 , H04B10/29 , H04B10/293 , H04B10/294 , H04B10/564 , H04B10/572 , H04J14/00 , H04J14/02 , H04B10/16 , H04B10/04 , H04B10/06 , H04B10/14 , H04B10/17
摘要： PROBLEM TO BE SOLVED: To provide an optical amplifier that has an autonomous control function for making the gain flat. SOLUTION: The optical amplifier includes an optical amplifier section 1 for directly amplifying signal light with a plurality of wavelengths, a laser diode 2 for generating auxiliary signal light with a wavelength shorter than the wavelength range of the main signal with one or more wavelengths within a prescribed wavelength range and modulated with a frequency f1, a laser diode 3 for generating auxiliary signal light with a wavelength longer than the wavelength range of the main signal and modulated with a frequency f2, a 13 dB photocoupler 7 for composing the main signal light with the two pieces of auxiliary signal light and outputting the result to the optical amplifier section 1, electric filters 11, 12 for separating the two pieces of auxiliary signal light with modulation signals having the frequencies f1 and f2 to detect them, a control circuit 13 for controlling the gain of the optical amplifier section 1 according to the respective modulation signal levels detected by the electric filters 11, 12, and an optical filter 9 for outputting only the main signal light included in the output light of the optical amplifier section 1 as the amplified light to the outside.
摘要翻译：要解决的问题：提供一种具有用于使增益平坦的自主控制功能的光放大器。解决方案：光放大器包括用于直接放大具有多个波长的信号光的光放大器部分1，用于产生波长短于主信号的波长范围的波长范围的辅助信号光的激光二极管2，其中一个或多个波长在规定的波长范围并用频率f1进行调制;激光二极管3，用于产生波长比主信号的波长范围长的波长范围并以频率f2调制的辅助信号光; 13dB光电耦合器7，用于组成主信号光; 将两条辅助信号光输出到光放大器部分1，用于将具有频率为f1和f2的调制信号分离两条辅助信号光的电流滤波器11,12用于检测它们;控制电路13，用于根据由ele检测到的各个调制信号电平来控制光放大器部分1的增益滤光片11,12和光滤波器9，仅将包含在光放大器部分1的输出光中的主信号光作为放大光输出到外部。

2. 发明专利

JP2007274506A Optical wireless system 审中-公开
标题翻译：光学无线系统
公开(公告)号：JP2007274506A
公开(公告)日：2007-10-18
申请号：JP2006099428
申请日：2006-03-31
申请人： Mitsubishi Electric Corp , 三菱電機株式会社
发明人： YOKOYA TETSUYA , MOTOJIMA KUNIAKI
IPC分类号： H04B10/03 , H04B10/032 , H04B10/11 , H04B10/112 , H04L12/28 , H04W8/00 , H04W24/04 , H04W72/04 , H04W74/06 , H04W84/10 , H04W84/12
摘要： PROBLEM TO BE SOLVED: To provide an optical wireless system for improving network throughput and increasing a data transmission rate. SOLUTION: This optical wireless system comprises a plurality of optical nodes 2 to be accommodated in an optical hub 1 and uses an optical beam for communication. In time-sharing mode, this system alternately switches between a discovery state allowing the optical hub 1 to detect an optical node 2 under its control and a user communication state allowing communication between the optical node 2 detected in the discovery state and the optical hub 1. In the user communication state, the optical hub 1 sequentially communicates with the optical node 2 detected in the discovery mode via a concentration-concentration system. COPYRIGHT: (C)2008,JPO&INPIT
摘要翻译：要解决的问题：提供一种用于提高网络吞吐量并提高数据传输速率的光学无线系统。解决方案：该光无线系统包括要容纳在光学集线器1中并使用光束进行通信的多个光学节点2。在分时模式下，该系统交替地在允许光学集线器1检测其控制下的光节点2的发现状态和允许在发现状态下检测到的光节点2与光学集线器1之间的通信的用户通信状态在用户通信状态下，光中心1通过浓度浓度系统与发现模式中检测到的光节点2顺序通信。版权所有（C）2008，JPO＆INPIT

3. 发明专利

JP2003029225A Variable optical filter 审中-公开
标题翻译：可变光学滤波器
公开(公告)号：JP2003029225A
公开(公告)日：2003-01-29
申请号：JP2001217157
申请日：2001-07-17
申请人： Mitsubishi Electric Corp , 三菱電機株式会社
发明人： KOGURE TAICHI , MOTOJIMA KUNIAKI
IPC分类号： G02F1/09 , G02F1/23
摘要： PROBLEM TO BE SOLVED: To obtain a variable optical filter capable of performing fast and dynamic response without using a mechanical movable mechanism. SOLUTION: This variable optical filter having a periodical loss wavelength characteristic with a wavelength and a loss variable by cascading first and second optical filters 1 and 2 having the same amplitude variable characteristic and the same FSR and a loss wavelength characteristic with a phase shifted and controlling the amplitude of the first and second optical filters 1 and 2.
摘要翻译：要解决的问题：获得能够在不使用机械可移动机构的情况下执行快速和动态响应的可变滤光器。解决方案：该可变滤波器具有波长特性和波长特性，通过级联具有相同幅度可变特性和相同FSR和相位移和控制的损耗波长特性的第一和第二滤光器1和2的波长和损耗可变第一和第二滤光器1和2的振幅。

4. 发明专利

JP2003338792A Optical multiplex device 审中-公开
标题翻译：光学多路器件
公开(公告)号：JP2003338792A
公开(公告)日：2003-11-28
申请号：JP2003127880
申请日：2003-05-06
申请人： Mitsubishi Electric Corp , 三菱電機株式会社
发明人： SHIMIZU KATSUHIRO , MIZUOCHI TAKASHI , NAKAGAWA JUNICHI , MOTOJIMA KUNIAKI , KITAYAMA TADAYOSHI
IPC分类号： H04B10/2507 , H04B10/07 , H04B10/508 , H04B10/524 , H04B10/54 , H04B10/588 , H04J14/08 , H04B10/02 , H04B10/18
摘要： PROBLEM TO BE SOLVED: To obtain a light time-division multiplex signal of high quality using a simple constitution, without converting the light signal into an electrical signal or generating jitters.
SOLUTION: An optical multiplexing device characterized by providing a light generation source which generates light signal of intensity modulation in a specified frequency, a first wave multiplexing and demultiplexing device which demultiplexes an output of the light source, a variable light delay device which controls the transmission delay time of a first light signal demultiplexed by the first wave multiplexing and demultiplexing device, a second wave multiplexing and demultiplexing device which combines the second light signal separated by the first wave multiplexing and demultiplexing device and the first light signal delayed by the variable optical delay device, a detection circuit which detects jitters of the combined signal by the second wave multiplexing and demultiplexing device, and a variable optical delay device control circuit, which controls the transmission delay time of the variable delay device so as to make an interval of the combined signal by the second wave multiplexing and demultiplexing device to be an equal interval, based on the detected result of the detecting circuit.
COPYRIGHT: (C)2004,JPO
摘要翻译：要解决的问题：为了使用简单的结构获得高质量的光时分复用信号，而不将光信号转换成电信号或产生抖动。解决方案：一种光学多路复用装置，其特征在于提供产生以特定频率的强度调制的光信号的光产生源，对光源的输出进行多路分解的第一波多路复用和解复用装置，可变光延迟装置，控制由第一波多路复用和解复用装置解复用的第一光信号的传输延迟时间;第二波复用和解复用装置，其组合由第一波多路复用和解复用装置分离的第二光信号和由第一波复用和解复用装置延迟的第一光信号可变光延迟装置，检测由第二波复用和解复用装置组合的信号的抖动的检测电路，以及可变光延迟装置控制电路，其控制可变延迟装置的传输延迟时间以使间隔的组合信号由第二波基于检测电路的检测结果，复合和解复用器件等于间隔。版权所有（C）2004，JPO

5. 发明专利

JP2003078486A Method for evaluating and testing optical transmitter- receiver, multiplexing integrated circuit, demultiplexing integrated circuit, united multiplexing/demultiplexing integrated circuit, and optical transmitter-receiver 审中-公开
标题翻译：用于评估和测试光学发射器 - 接收器，多路复用集成电路，解复用集成电路，多路复用/解复用集成电路和光发射机 - 接收机的方法
公开(公告)号：JP2003078486A
公开(公告)日：2003-03-14
申请号：JP2001264376
申请日：2001-08-31
申请人： Mitsubishi Electric Corp , 三菱電機株式会社
发明人： TOTSUKA YOJI , KUBO KAZUO , MOTOJIMA KUNIAKI
IPC分类号： H04B10/07 , H04B10/035 , H04B10/077 , H04B10/079 , H04B10/40 , H04B10/50 , H04B10/60 , H04B17/00 , H04J3/00 , H04L1/24 , H04B10/04 , H04B10/06 , H04B10/08 , H04B10/14 , H04B10/26 , H04B10/28
CPC分类号： H04L1/243
摘要： PROBLEM TO BE SOLVED: To specify which path of an optical transmitter receiver has trouble.
SOLUTION: The optical transmitter-receiver 1 has 1st and 2nd pseudo- random pattern generators 23 and 28, generating pseudo-random pattern signals, and 1st and 2nd pseudo-random pattern detectors 21 and 26, evaluating inputted pseudo-random pattern signals, in its transmission-side path 6 and receptions-side path 11 and is equipped with a 1st return path 31 for a return from a multiplexing circuit 3 to a demultiplexing circuit 8 and a 2nd return path 32 for a return from an optoelectric conversion part 7 to an electrooptic conversion part 4.
COPYRIGHT: (C)2003,JPO
摘要翻译：要解决的问题：指定光接收机的哪个路径有问题。解决方案：光发射机 - 接收机1具有第一和第二伪随机模式发生器23和28，产生伪随机模式信号，以及第一和第二伪随机模式检测器21和26，评估输入的伪随机模式信号，其发送侧路径6和接收侧路径11，并且配备有用于从多路复用电路3返回到解复用电路8的第一返回路径31和用于从光电转换部7返回到第二返回路径32的第二返回路径32 电光转换部分4。

6. 发明专利

JP2002319904A OPTICAL TIME DIVISION MULTIPLEX TRANSMISSION SYSTEM 失效
公开(公告)号：JP2002319904A
公开(公告)日：2002-10-31
申请号：JP2001121711
申请日：2001-04-19
申请人： MITSUBISHI ELECTRIC CORP
发明人： ISSHIKI KUNIHIKO , MOTOJIMA KUNIAKI
IPC分类号： H04B10/27 , H04B10/275 , H04B10/299 , H04J3/00 , H04J14/08 , H04L7/08 , H04L12/423 , H04B10/20
摘要： PROBLEM TO BE SOLVED: To provide communication services, with which the high speed property of light is effectively utilized, to a large number of subscribers connected to a ring-shaped optical fiber transmission line while using a one-wavelength transmission system, which maintenance/management is facilitated. SOLUTION: A central station installing device 1 and a plurality of subscriber installing devices 2a-2i are connected in the shape of ring by an optical fiber transmission line 3. In the central station installing device 1, the signal light pulse stream of high speed is generated and transmitted to the optical fiber transmission line by multiplexing the signal light pulse stream of low speed in the time division manner in an optical region. In a plurality of subscriber installing devices 2a-2i, the received optical pulse of a prescribed time slot is branched out of the optical time division multiplex signal light pulse stream received from the optical fiber transmission line in the optical region and received as a signal light pulse stream of low speed, and the transmitted optical pulse of low speed is inserted to the same time slot in the optical region and transmitted to the optical fiber transmission line 3 as an optical time division multiplex signal light pulse stream of high speed.

7. 发明专利

JP2001060921A POINT-MULTIPOINT OPTICAL COMMUNICATION SYSTEM 失效
公开(公告)号：JP2001060921A
公开(公告)日：2001-03-06
申请号：JP23282999
申请日：1999-08-19
申请人： MITSUBISHI ELECTRIC CORP , NIPPON TELEGRAPH & TELEPHONE
发明人： MOTOJIMA KUNIAKI , AOYANAGI SHINICHI
IPC分类号： H04B10/07 , H04B10/2507 , H04B10/27 , H04B10/272 , H04B10/293 , H04B10/564 , H04B10/572 , H04J3/00 , H04J14/08 , H04L12/44 , H04B10/20 , H04B10/04 , H04B10/06 , H04B10/14
摘要： PROBLEM TO BE SOLVED: To suppress the deterioration of a reception sensitivity without thoroughly maintaining and managing the connecting state of a connection member such as an optical connector by reducing the transmission level of an incoming optical signal to reduce the reception level of an incoming signal at a station side device through the use of a subscriber side device when the reception level of an outgoing optical signal from the station side device is higher than a prescribed level. SOLUTION: The subscriber side receiver 14 of the subscriber side device converts the outgoing optical signal to be inputted from the station side device with a subscriber side wave length multiplex optical circuit 15 into an electric signal by a light receiving photodiode 17 and it is amplified by an amplifier 18. A level detecting circuit 20 compares the output level of the amplifier 18 with a prescribed output change-over threshold and outputs a judging signal corresponding to the comparison result. An optical output control circuit 25 outputs a light amount indicating signal to a driving circuit 22 to output a light amount by a level corresponding to the judging signal based on the output of a monitor photodiode 24 and, in response to it, the driving circuit 22 controls the light emitting amount of a semiconductor laser element 23.

8. 发明专利

JP2000357929A PREAMPLIFIER CIRCUIT 失效
公开(公告)号：JP2000357929A
公开(公告)日：2000-12-26
申请号：JP17015599
申请日：1999-06-16
申请人： MITSUBISHI ELECTRIC CORP
发明人： NOGAMI MASAMICHI , MOTOJIMA KUNIAKI , MATSUI KENICHI
IPC分类号： H03F3/45 , H03F1/34 , H03F3/08 , H04B10/07 , H04B10/2507 , H04B10/40 , H04B10/50 , H04B10/60 , H04B10/69 , H04B10/04 , H04B10/06 , H04B10/14 , H04B10/26 , H04B10/28
摘要： PROBLEM TO BE SOLVED: To reduce deterioration of pulse width and to attain proper optical communication by providing a constitution, where a differential input/output type differential amplifier means converts a current signal into a voltage signal, a generator means generates a midpoint potential between the positive and negative phase outputs of the differential amplifier means, and a 1st feedback load means is placed between the output terminal of the generator means and the negative phase input terminal of the differential amplifier means. SOLUTION: A differential amplifier 2 outputs positive and negative phase outputs, in response to an input signal. A midpoint potential generating circuit 4 inputs the positive and negative phase outputs and generates a midpoint potential between these phase outputs. A feedback resistance 5 feeds the midpoint potential back to the negative phase input terminal of the amplifier 2. Then the threshold voltage of the midpoint potential becomes equal to 0 level of the input signal to attain an operation that uses the linear region of the amplifier 2 to its maximum. As a result, the distortion of output duty is reduced despite the presence of a large input signal near the largest light receiving power.

9. 发明专利

JPH10284954A BIAS VOLTAGE CONTROL CIRCUIT FOR AVALANCHE PHOTODIODE 失效
公开(公告)号：JPH10284954A
公开(公告)日：1998-10-23
申请号：JP8676697
申请日：1997-04-04
申请人： MITSUBISHI ELECTRIC CORP
发明人： TAGAMI HITOSHI , NOGAMI MASAMICHI , MOTOJIMA KUNIAKI
IPC分类号： H03F3/08 , H04B10/07 , H04B10/40 , H04B10/50 , H04B10/60 , H04B10/67 , H04B10/69 , H04B10/04 , H04B10/06 , H04B10/14 , H04B10/26 , H04B10/28
摘要： PROBLEM TO BE SOLVED: To easily decide the max. value and the min. value of the bias voltage of APD(avalanche photodiode) by connecting NPN transistors to the both ends of the output resistance of a voltage control current source to which an APD cathod is connected by bias control circuit of the APD, thereby appling a prescribed voltage to the APD cathod. SOLUTION: The voltage control current source 51 controls current flowing in an output resistance 54 and the voltage obtained by subtracting voltage lowering in the output resistance 54 from a high-order power voltage 55 is impressed on the APD cathod. The upper limit of the voltage to be applied to the APD cathod is decided by the voltage obtained by subtracting a voltage lowering portion of APD bias current by the resistance 54. The NPN transistors 58 are connected to the both ends of the resistance 54 and its base is connected to a clip terminal 57 for outputting a prescribed voltage. At the time of the saturation of a transistor 52, the lower limit of the voltage to be applied to the APD cathod is decided by an emitter resistance 53 and the clip voltage.

10. 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.

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