专利快速检索-快速检索全球专利，免费商用专利数据库-IPRDB

1. 发明授权

US09853765B2 Signal processing device and signal processing method for optical polarization multiplexed signal 有权
公开(公告)号：US09853765B2
公开(公告)日：2017-12-26
申请号：US14782838
申请日：2014-02-19
申请人： NEC Corporation
发明人： Wakako Yasuda , Junichi Abe
IPC分类号： H04J14/06 , H04B10/61
CPC分类号： H04J14/06 , H04B10/6161 , H04B10/6162 , H04B10/6163
摘要： An optical reception device 20 includes an electric signal generation unit 200, a linear compensation unit 301, a nonlinear compensation unit 300, and a second coefficient setting unit 400. The electric signal generation unit 200 generates an electric signal based on an optical signal received over a transmission path 30. The linear compensation unit 301 performs processing for compensating for dispersion that occurs on optical signal in the transmission path 30 to the electric signal, using a first filter coefficient. The second coefficient setting unit 400 determines a second filter coefficient for compensating for a nonlinear effect that occurs on the optical signal in the transmission path 30, using an amount of dispersion that occurs in the transmission path 30. The nonlinear compensation unit 300 performs processing for compensating the electric signal for the nonlinear effect, using the second filter coefficient that is determined by the second coefficient setting unit 400.

2. 发明授权

US09246599B2 Coherent optical receiver, apparatus and method for detecting interchannel skew in coherent optical receiver 有权
标题翻译：相干光接收机，用于检测相干光接收机中的信道间偏斜的装置和方法
公开(公告)号：US09246599B2
公开(公告)日：2016-01-26
申请号：US14078725
申请日：2013-11-13
申请人： NEC CORPORATION
发明人： Wakako Yasuda , Junichi Abe , Kiyoshi Fukuchi
IPC分类号： H04B10/00 , H04B10/61 , H04J14/02 , H04J14/06
CPC分类号： H04B10/616 , H04B10/6151 , H04J14/02 , H04J14/06
摘要： In a coherent optical receiver, sufficient demodulation becomes impossible and consequently receiving performance deteriorates if an interchannel skew arises, therefore, a coherent optical receiver according to an exemplary aspect of the invention includes a local light source; a 90-degree hybrid circuit; an optoelectronic converter; an analog-to-digital converter; and a digital signal processing unit, wherein the 90-degree hybrid circuit makes multiplexed signal light interfere with local light from the local light source, and outputs a plurality of optical signals separated into a plurality of signal components; the optoelectronic converter detects the optical signals and outputs detected electrical signals; the analog-to-digital converter quantizes the detected electrical signals and outputs quantized signals; and the digital signal processing unit includes a skew compensation unit for compensating a difference in propagation delay between the plurality of signal components, and a demodulation unit for demodulating the quantized signals.
摘要翻译：在相干光接收机中，如果出现通道间偏斜，则不能进行足够的解调，因此接收性能恶化，因此根据本发明的示例性方面的相干光接收机包括本地光源; 90度混合电路; 光电转换器; 一个模拟 - 数字转换器; 以及数字信号处理单元，其中所述90度混合电路使多路复用信号光干扰来自所述本地光源的局部光，并且输出分离成多个信号分量的多个光信号; 光电转换器检测光信号并输出检测到的电信号; 模数转换器对检测到的电信号进行量化并输出量化信号; 并且数字信号处理单元包括用于补偿多个信号分量之间的传播延迟差的偏斜补偿单元和用于解调量化信号的解调单元。

3. 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.

4. 发明授权

US09923641B2 Signal processing device, optical communication system, and signal processing method 有权
公开(公告)号：US09923641B2
公开(公告)日：2018-03-20
申请号：US14779135
申请日：2013-09-19
申请人： NEC Corporation
发明人： Wakako Yasuda , Junichi Abe , Daisaku Ogasahara
IPC分类号： H04B10/61 , H04B10/2513
CPC分类号： H04B10/6161 , H04B10/2513 , H04B10/25133 , H04B10/613 , H04B10/614 , H04B10/6163 , H04B10/6165
摘要： An optical receiver (20) includes an electrical signal generation unit (200), a first phase compensation unit (101), a distortion compensation unit (102), and a first dispersion compensation unit (400). The electrical signal generation unit (200) generates an electrical signal on the basis of received signal light. The first phase compensation unit (101) performs a phase rotation compensation process on the electrical signal generated by the electrical signal generation unit (200). The distortion compensation unit (102) performs a dispersion compensation process and a phase rotation compensation process in this order, at least once, on the electrical signal after having compensation performed thereon by the first phase compensation unit. The electrical signal generation unit (200), the first phase compensation unit (101), and the distortion compensation unit (102) are incorporated into one semiconductor device.

5. 发明授权

US09831956B2 Signal processing device and signal processing method 有权
公开(公告)号：US09831956B2
公开(公告)日：2017-11-28
申请号：US14765908
申请日：2013-09-19
申请人： NEC Corporation
发明人： Wakako Yasuda , Junichi Abe
IPC分类号： H04B10/2507 , H04B10/61 , H04J14/06 , H04B10/079 , H04B10/2543
CPC分类号： H04B10/6165 , H04B10/0795 , H04B10/2543 , H04B10/2572 , H04B10/613 , H04B10/614 , H04B10/6163 , H04J14/06
摘要： A nonlinear compensation unit (300) includes a first compensation unit (350) and a second compensation unit (360). The first compensation unit (350) compensates for each of two polarization signals Ex and Ey so as to cancel a first amount of phase rotation which is the amount of phase rotation calculated based on the signal strength of the two polarization signals Ex and Ey. The second compensation unit (360) compensates for each of the two polarization signals Ex and Ey so as to cancel a second amount of phase rotation which is the amount of phase rotation calculated based on the perturbative component of the two polarization signals Ex and Ey. The first compensation unit (350) includes a strength calculation unit (302), a first filter unit (304), and a first phase modulation unit (306). The second compensation unit (360) includes a perturbative component calculation unit (316), a second filter unit (318), a second phase modulation unit (322), and a third phase modulation unit (330).

6. 发明申请

US20140286638A1 SIGNAL PROCESSING APPARATUS AND SIGNAL PROCESSING METHOD 有权
标题翻译：信号处理装置和信号处理方法
公开(公告)号：US20140286638A1
公开(公告)日：2014-09-25
申请号：US14350125
申请日：2012-10-05
申请人： NEC CORPORATION
发明人： Wakako Yasuda , Daisaku Ogasahara , Shinsuke Fujisawa
IPC分类号： H04B10/61 , H04J14/06
CPC分类号： H04B10/6166 , H04B10/612 , H04B10/614 , H04B10/6164 , H04B10/6165 , H04J14/06 , H04L27/3818
摘要： Signal processing means includes carrier compensation means for compensating for a phase difference and a frequency difference between signal light and local light in relation to two polarization signals, so as to generate two carrier compensated signals, symbol determination means for demodulating the two carrier compensated signals on the basis of a signal arrangement of multi-value modulation, symbol rough-determination means for demodulating the two carrier compensated signals on the basis of a signal arrangement in which the number of multi-values of the multi-value modulation is reduced, selection means for selecting either of an output of the symbol determination means and an output of the symbol rough-determination means, and coefficient setting means for updating filter coefficients of polarized wave separation means by using an output selected by the selection means.
摘要翻译：信号处理装置包括用于相对于两个偏振信号补偿相位差和信号光与局部光之间的频率差的载波补偿装置，以产生两个载波补偿信号，用于解调两个载波补偿信号的符号确定装置多值调制信号配置的基础，根据减少多值调制的多值的信号配置来解调两载波补偿信号的符号粗略判定装置，选择装置用于选择符号确定装置的输出和符号粗略判定装置的输出中的任一个;以及系数设定装置，用于通过使用由选择装置选择的输出来更新偏振波分离装置的滤波器系数。

7. 发明授权

US10530491B2 Coherent optical receiver, device and method for detecting inter-lane skew in coherent optical receiver 有权
公开(公告)号：US10530491B2
公开(公告)日：2020-01-07
申请号：US15606698
申请日：2017-05-26
申请人： NEC Corporation
发明人： Kiyoshi Fukuchi , Junichi Abe , Wakako Yasuda
IPC分类号： H04B10/61
摘要： The disclosed coherent optical receiver includes a local light source; a 90-degree hybrid circuit; an optoelectronic converter; an analog-to-digital converter; a skew addition unit; and a FFT operation unit. The 90-degree hybrid circuit makes multiplexed signal light interfere with local light from the local light source, and outputs multiple optical signals separated into a plurality of signal components. The optoelectronic converter detects the optical signal and outputs a detected electrical signal. The analog-to-digital converter digitizes the detected electrical signal and outputs a detected digital signal. The skew addition unit adds to the detected digital signal an additional skew amount whose absolute value is equal to, whose sign is opposite to a skew amount of a difference in propagation delay in each lane connected to each output channel of the 90-degree hybrid circuit. The FFT operation unit performs a fast Fourier transform on the output from the skew addition unit.

8. 发明授权

US10530489B2 Optical signal reception apparatus, optical communication system, and method of generating compensation signal of optical signal reception apparatus 有权
公开(公告)号：US10530489B2
公开(公告)日：2020-01-07
申请号：US16089180
申请日：2017-02-27
申请人： NEC CORPORATION
发明人： Wakako Yasuda
IPC分类号： H04B10/60 , H04B10/61 , H04L27/22 , H04J14/06 , H04L27/38
摘要： A frequency difference compensation unit (510) generates a carrier recovery signal by compensating for a frequency difference between a local light beam and an optical signal in a plurality of digital signals. A first symbol determination unit (521) determines the symbol position of the carrier recovery signal in which a frequency difference is compensated for, in accordance with the signal arrangement of multi-value modulation. A second symbol determination unit (522) determines the symbol position of the carrier recovery signal in which a frequency difference is compensated for, in accordance with a signal arrangement in which the number of multi-values of the multi-value modulation is reduced. A loop filter unit (540) and a compensation signal generation unit (550) temporarily generates a compensation signal using a determination result of the second symbol determination unit (522), and then regularly generates the compensation signal using a determination result of the first symbol determination unit (521).

9. 发明授权

US10193593B2 Signal processing device, communication system, and signal processing method 有权
公开(公告)号：US10193593B2
公开(公告)日：2019-01-29
申请号：US15753694
申请日：2016-06-22
申请人： NEC CORPORATION
发明人： Wakako Yasuda , Kazunori Hayashi
IPC分类号： H04B10/61 , H04B3/06 , H04B10/2507 , H04J11/00 , H04L27/01 , H04J14/06
摘要： A transfer function calculation unit (522) calculates a diagonal matrix G(f) on the basis of a band limit condition g(t) used in a transmission device (20). A transfer function calculation unit (524) calculates a diagonal matrix C(f) on the basis of a wavelength dispersion amount c(t) incurred in an optical transmission path. A transfer function combination unit (526) combines the diagonal matrix G(f) with the diagonal matrix C(f) so as to calculate a diagonal matrix H(f)=G(f)×C(f). An equalization coefficient calculation unit (528) calculates an equalization coefficient matrix W(f)=H(f)H(H(f)HH(f)+(1/Es)×Φη)−1 used in a multiplication unit (506) by using the diagonal matrix H(f). Here, H(f)H is a Hermitian transposed matrix of a matrix H(f), Es is power of an optical signal, and Φη is a diagonal matrix with N rows and N columns.

你已经成功收藏专利！

检索式保存成功!

IPRDB

热门服务

关于我们

友情链接

联系方式