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31. 发明授权

US11435477B2 Distance measurement based on difference of two beat signals generated from same reference light 有权
公开(公告)号：US11435477B2
公开(公告)日：2022-09-06
申请号：US16982021
申请日：2018-03-28
申请人： NEC Corporation
发明人： Hidemi Noguchi
IPC分类号： G01B9/02 , G01S17/34 , G01B9/02003
摘要： A distance measurement device (2000) generates transmission light by modulating an optical carrier wave. The distance measurement device (2000) transmits the generated transmission light, and receives reflected light acquired by the transmission light being reflected by a measured object (10). The distance measurement device (2000) generates a first beat signal by causing the transmission light to interfere with reference light. The distance measurement device (2000) generates a second beat signal by causing the reflected light to interfere with the reference light. The distance measurement device (2000) calculates a distance to the measured object (10), based on a difference between the first beat signal and the second beat signal.

32. 发明授权

US10819443B2 Optical communications system and optical frequency control method 有权
公开(公告)号：US10819443B2
公开(公告)日：2020-10-27
申请号：US16490632
申请日：2018-03-05
申请人： NEC Corporation
发明人： Hidemi Noguchi
IPC分类号： H04B10/67 , H04B10/079 , H04B10/61 , H04J14/02 , H04B10/60 , H04B10/50
摘要： The receiving-side system (10) includes a smaller number of optical reception front ends (12) than the number of a plurality of wavelength-multiplexed subcarrier signals. Each of the optical reception front ends (12) is configured to receive two or a plurality subcarrier signals of the plurality of subcarrier signals. A frequency offset monitoring unit (22) monitors frequency offsets of the respective subcarrier signals received by the optical reception front end (12). A light source frequency control unit (24) controls at least one of a light source frequency of the transmitting-side system (2) and a light source frequency of the receiving-side system (10) based on a result of the monitoring performed by the frequency offset monitoring unit (22).

33. 发明授权

US10171177B2 Digital signal processor, digital optical receiver using the same, and digital signal processing method 有权
公开(公告)号：US10171177B2
公开(公告)日：2019-01-01
申请号：US15534120
申请日：2015-12-15
申请人： NEC Corporation
发明人： Wakako Yasuda , Hidemi Noguchi
IPC分类号： H04B10/03 , H04B10/69 , H04B10/2507 , H04B10/61 , H04J11/00 , H04L25/03
摘要： It is difficult to obtain a demodulated signal with high signal quality in a digital optical receiver because it is difficult to compensate for each of different types of waveform distortion by a high-performance equalization process; therefore, a digital signal processor according to an exemplary aspect of the present invention includes a fixed equalization means for performing a distortion compensation process based on a fixed equalization coefficient on an input digital signal; an adaptive equalization means for performing an adaptive distortion compensation process based on an adaptive equalization coefficient on an equalized digital signal output by the fixed equalization means; a low-speed signal generation means for generating a low-speed digital signal by intermittently extracting one of the input digital signal and the equalized digital signal; a low-speed equalization coefficient calculation means for calculating a low-speed equalization coefficient to be used for a distortion compensation process of the low-speed digital signal; and a fixed equalization coefficient calculation means for calculating the fixed equalization coefficient by using at least a predetermined coefficient out of the low-speed equalization coefficient and the predetermined coefficient.

34. 发明申请

US20150280831A1 OPTICAL TRANSMISSION SYSTEM, OPTICAL PHASE MODULATOR, AND OPTICAL MODULATION METHOD 有权
标题翻译：光传输系统，光相位调制器和光调制方法
公开(公告)号：US20150280831A1
公开(公告)日：2015-10-01
申请号：US14433713
申请日：2013-07-31
申请人： NEC CORPORATION
发明人： Hidemi Noguchi
IPC分类号： H04B10/548
CPC分类号： H04B10/548 , G02F1/0121 , H04B10/5051 , H04B10/508 , H04B10/516 , H04B10/5561
摘要： The optical transmission system incudes signal output means (11S) for outputting a drive signal according to an input signal to the first optical modulator (11a), first waveform shaping signal output means (12S) for outputting a first waveform shaping signal to the second optical modulator (10A), and second waveform shaping signal output means (13S) for outputting a second waveform shaping signal to the third optical modulator (13a). The first waveform shaping signal is output to the second optical modulator (10A) at a timing relatively later than a timing of an output of a signal by the first optical modulator (11a). The second waveform shaping signal is output to the third optical modulator (13a) at a timing relatively earlier than the timing of the output of the signal by the first optical modulator (11a).
摘要翻译：光传输系统包括用于根据到第一光调制器（11a）的输入信号输出驱动信号的信号输出装置（11S），第一波形整形信号输出装置（12S），用于将第一波形整形信号输出到第二光调制器（10A）和用于向第三光调制器（13a）输出第二波形整形信号的第二波形整形信号输出装置（13S）。第一波形整形信号在比由第一光调制器（11a）输出信号的定时更晚的定时输出到第二光调制器（10A）。第二波形整形信号在比由第一光调制器（11a）输出信号的定时更早的时间被输出到第三光调制器（13a）。

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