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1. 发明公开

US20240129041A1 OPTICAL RELAY APPARATUS, OPTICAL TRANSMISSION SYSTEM, AND OPTICAL RELAY METHOD 审中-公开
公开(公告)号：US20240129041A1
公开(公告)日：2024-04-18
申请号：US18277732
申请日：2021-02-26
申请人： NEC Corporation
发明人： Hidemi Noguchi
IPC分类号： H04B10/532 , H04B10/40 , H04B10/61
CPC分类号： H04B10/532 , H04B10/40 , H04B10/6162
摘要： An optical transceiver (101) of an optical relay apparatus includes: a coherent reception front-end unit (110) that coherently detects an input optical signal to be input, based on local oscillation light, and outputs the coherently detected first analog electric signal; a coherent transmission front-end unit (120) that coherently modulates a second analog electric signal acquired by turning around the first analog electric signal, based on transmission light, and outputs the coherently modulated output optical signal; and an analog compensation unit (130) that performs analog signal processing on the first analog electric signal in such a way as to compensate for signal quality according to a signal characteristic between an input of the coherent reception front-end unit (110) and an output of the coherent transmission front-end unit (120), and thereby generates the second analog electric signal.

2. 发明公开

US20230412297A1 OPTICAL AMPLIFIER, OPTICAL AMPLIFIER CONTROLLING METHOD, AND OPTICAL TRANSMISSION SYSTEM 审中-公开
公开(公告)号：US20230412297A1
公开(公告)日：2023-12-21
申请号：US18031208
申请日：2020-10-26
申请人： NEC Corporation
发明人： Keiichi MATSUMOTO , Hitoshi Takeshita , Hidemi Noguchi , Emmanuel Le Taillandier de Gabory
IPC分类号： H04J14/02 , H01S3/067
CPC分类号： H04J14/02216 , H01S3/06754 , H04J14/0212
摘要： An optical amplifier that amplifies an incident WDM signal and includes cores having an amplification medium, the optical amplifier includes: a wavelength demultiplexer configured to demultiplex the incident WDM signal into wavelength bands and introducing the demultiplexed WDM signals into the cores separately; a wavelength multiplexer configured to multiplex amplified optical signals propagated through the cores and outputting the multiplexed signal; and an wavelength demultiplexing controller configured to monitor an amplification rate of a specific wavelength band of an amplified WDM signal or a scale associated with an amplification rate of a specific wavelength band, demultiplexing, from the incident WDM signal, an optical signal of a wavelength band having relatively-small optical amplification efficiency according to a monitoring result, and controlling demultiplexing performed by the wavelength demultiplexer in such a way as to amplify, with a relatively-large amplification rate, the optical signal of the wavelength band having relatively-small optical amplification efficiency.

3. 发明公开

US20230327767A1 OPTICAL TRANSMISSION SYSTEM, AND OPTICAL TRANSMISSION METHOD 审中-公开
公开(公告)号：US20230327767A1
公开(公告)日：2023-10-12
申请号：US18025109
申请日：2020-09-11
申请人： NEC Corporation
发明人： Hitoshi Takeshita , Keiichi Matsumoto , Hidemi Noguchi , Kohei Hosokawa
IPC分类号： H04B10/291 , H01S3/067 , H01S3/094
CPC分类号： H04B10/2912 , H01S3/094003 , H01S3/06737
摘要： The optical transmission system of the present invention includes a multi-core transmission path which includes a plurality of cores, and in which optical signals propagate through the plurality of cores, a first optical repeating means for amplifying the optical signals by individually exciting first multi-core optical amplification mediums, and a second optical repeating means for amplifying the optical signals by collectively exciting second multi-core optical amplification mediums, wherein the first optical repeating means is positioned spaced apart from the second optical repeating means by a distance determined on the basis of either a first transmissible distance due to the first optical repeating means and a second transmissible distance due to the second optical repeating means.

4. 发明申请

US20230047836A1 MONITORING DEVICE, MONITORING METHOD, OPTICAL AMPLIFIER, AND OPTICAL TRANSMISSION SYSTEM 有权
公开(公告)号：US20230047836A1
公开(公告)日：2023-02-16
申请号：US17797959
申请日：2021-02-15
申请人： NEC Corporation
发明人： Keiichi Matsumoto , Hidemi Noguchi
IPC分类号： H01S3/067 , H01S3/13 , G02B6/02
摘要： Provided are a monitoring device, a monitoring method, an optical amplifier, and an optical transmission system that are adapted for an increase in the number of cores in a multi-core optical fiber transmission path, and that are suitable for crosstalk monitoring. The monitoring device monitors a multi-core optical fiber transmission path comprising a plurality of use core and at least one or more non-use cores. The monitoring device comprises: an applying means for applying dithering to signal light propagating in the use cores; a monitoring means for monitoring the power of the non-use cores; and a separating means for separating a monitoring result from the monitoring means into power components from the plurality of use cores.

5. 发明授权

US10790901B2 Reception device, transmission device, optical communication system, and optical communication method 有权
公开(公告)号：US10790901B2
公开(公告)日：2020-09-29
申请号：US16470652
申请日：2017-12-19
申请人： NEC Corporation
发明人： Hidemi Noguchi
IPC分类号： H04B10/079 , H04B10/69 , H04J14/02 , H04B10/07 , H04B10/66 , H04B10/25 , H04B10/40 , H04B10/43
摘要： A reception device 20 is configured to include a separation means 21 and a plurality of optical reception means 22. Each optical reception means 22 is configured to further include an optical/electrical conversion means 23 and a band restoration means 24. The separation means 21 separates a multiplexed signal into which signals of respective channels to which spectral shaping that narrows bandwidth to less than or equal to a baud rate is applied are multiplexed at spacings less than or equal to the baud rate on the transmission side into optical signals for the respective channels. Each optical/electrical conversion means 23 converts an optical signal to an electrical signal as a reception signal. Each band restoration means 24 applies processing having inverse characteristics to those of the band narrowing filter processing to the reception signal and restores the band of the reception signal.

6. 发明授权

US10735103B2 Reception device, transmission device, optical communication system and optical communication method 有权
公开(公告)号：US10735103B2
公开(公告)日：2020-08-04
申请号：US16473645
申请日：2017-12-19
申请人： NEC Corporation
发明人： Hidemi Noguchi
IPC分类号： H04B10/079 , H04B10/61 , H04J14/02 , H04L25/03
摘要： A reception device 20 is configured to include a separation means 21 and a plurality of optical reception means 22. Each optical reception means 22 further includes an optical/electrical conversion means 23, a reception coefficient computation means 24, and a band restoration means 25. The separation means 21 separates a multiplexed signal into which signals of respective channels to which spectral shaping that narrows bandwidth to less than or equal to a baud rate is applied as band narrowing filter processing on the transmission side, based on characteristics of a transmission line are multiplexed at spacings less than or equal to the baud rate. Each band restoration means 25 applies processing having inverse characteristics to those of the band narrowing filter processing to a reception signal, based on the band narrowing parameter acquired by the reception coefficient computation means 24 and thereby restores the band of the reception signal.

7. 发明授权

US10355787B2 Digital optical receiver and optical communication system using the same 有权
公开(公告)号：US10355787B2
公开(公告)日：2019-07-16
申请号：US16080754
申请日：2017-03-02
申请人： NEC Corporation
发明人： Hidemi Noguchi
IPC分类号： H04B10/61 , H04B10/69 , H04B3/06 , H04B10/2507 , H03M1/12
摘要： A digital optical receiver capable of adaptively correcting the linearity of an analog front end unit is provided. The digital optical receiver comprises: a photoelectric conversion unit that converts an optical signal into an analog electric signal and outputs the analog electric signal; an analog front end unit that converts the analog electric signal obtained from the photoelectric conversion unit into a digital electric signal and outputs the digital electric signal; a linearity correction unit that corrects the linearity of the digital electric signal obtained from the analog front end unit; a demodulation processing unit that demodulates a signal by using, as input, the digital electric signal obtained from the linearity correction unit; and a control unit that provides an offset signal to the analog electric signal outputted by the photoelectric conversion unit, obtains monitor information for the result of the provision of the offset signal, and controls the linearity correction unit so that the linearity correction unit corrects the linearity of the digital electric signal obtained from the analog front end unit on the basis of the monitor information.

8. 发明申请

US20150063822A1 OPTICAL TRANSMITTER, OPTICAL TRANSMISSION/RECEPTION SYSTEM, AND DRIVE CIRCUIT 有权
标题翻译：光学发射器，光传输/接收系统和驱动电路
公开(公告)号：US20150063822A1
公开(公告)日：2015-03-05
申请号：US14387005
申请日：2012-11-06
申请人： NEC Corporation
发明人： Hidemi Noguchi
IPC分类号： H04B10/556 , H04B10/27
CPC分类号： H04B10/5561 , G02F1/0121 , G02F1/2255 , H04B10/27
摘要： An optical modulator includes optical waveguides on which phase modulation regions are formed. A drive circuit includes a lower-bit drive unit, an upper-bit drive unit, and a bit splitting unit. The bit splitting unit splits an input digital signal into upper bits and lower bits. The lower-bit drive unit outputs a value obtained by performing D/A conversion on the lower bits to phase modulation regions. The upper-bit drive unit outputs, to phase modulation regions, a value greater than a maximum value of values output from the lower-bit drive unit, or a minimum value of the values output from the lower-bit drive unit, according to a value of the upper bits.
摘要翻译：光调制器包括其上形成有相位调制区域的光波导。驱动电路包括下位驱动单元，高位驱动单元和分位单元。分位单元将输入数字信号分为高位和低位。低位驱动单元通过对低位到相位调制区域进行D / A转换而得到的值。高位驱动单元向相位调制区域输出大于从低位驱动单元输出的值的最大值或从低位驱动单元输出的值的最小值的值，根据高位数值。

9. 发明授权

US12095502B2 Communication device, communication controlling method, non-transitory computer-readable medium, and optical communication system 有权
公开(公告)号：US12095502B2
公开(公告)日：2024-09-17
申请号：US17642385
申请日：2019-09-20
申请人： NEC Corporation
发明人： Yohei Hasegawa , Hidemi Noguchi , Shigeyuki Yanagimachi
IPC分类号： H04B10/07 , H04B10/079
CPC分类号： H04B10/07953
摘要： Provided is a communication device that can deliver an improvement in the communication capacity of communication infrastructure with the quality of communication taken into consideration. A communication device includes an acquiring unit configured to acquire quality information of a communication line extending from a first communication device to a second communication device and including an optical communication line, an estimating unit configured to estimate the quality of communication of the second communication device and determine the required quality of communication of the second communication device based on the quality information, and a controlling unit configured to perform control on communication channels in the optical communication line so that the quality of communication satisfies the required quality of communication.

10. 发明公开

US20230400557A1 OPTICAL DISTANCE MEASUREMENT DEVICE AND OPTICAL DISTANCE MEASUREMENT METHOD 审中-公开
公开(公告)号：US20230400557A1
公开(公告)日：2023-12-14
申请号：US18030444
申请日：2020-10-14
申请人： NEC Corporation
发明人： Hidemi Noguchi
IPC分类号： G01S7/484 , G01S17/10
CPC分类号： G01S7/484 , G01S17/10
摘要： An optical distance measurement device (10) includes a light transmission unit (11) that transmits distance measurement light to a measurement object, a light reception unit (12) that receives reflected light being reflected from the measurement object by the transmitted distance measurement light, a modulation unit (13) that generates reference light acquired by performing intensity modulation on a light source according to a distance measurement range, a detection unit (14) that generates a reception signal by causing the received reflected light and the generated reference light to interfere with each other, and a distance calculation unit (15) that calculates a distance to the measurement object, based on the transmitted distance measurement light and the generated reception signal.

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