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公开(公告)号：US20190132051A1
公开(公告)日：2019-05-02
申请号：US16094857
申请日：2017-06-21
发明人： Yasuharu ONUMA , Etsushi YAMAZAKI , Hiroyuki NOUCHI , Tomohiro TAKAMUKU , Katsuichi OYAMA , Kazuhito TAKEI , Masanori NAKAMURA , Mitsuteru YOSHIDA , Masahito TOMIZAWA
IPC分类号： H04B10/40 , H04B10/516 , H04B10/61 , H04B10/58
CPC分类号： H04B10/40 , H04B10/2507 , H04B10/5161 , H04B10/58 , H04B10/60 , H04B10/6163 , H04L27/01 , H04L27/06
摘要： An I component compensation unit calculates an I component in which a distortion has been compensated, by forming a first polynomial expressing the distortion of the I component based on an I component and a Q component of a quadrature modulation signal and multiplying each term of the first polynomial by a first coefficient. A Q component compensation unit calculates a Q component in which a distortion has been compensated, by forming a second polynomial expressing the distortion of the Q component based on the I component and the Q component of the quadrature modulation signal and multiplying each term of the second polynomial by a second coefficient. A coefficient calculation unit calculates the first and second coefficients by comparing outputs of the I component compensation unit and the Q component compensation unit and a known signal.
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公开(公告)号：US20190074909A1
公开(公告)日：2019-03-07
申请号：US16072420
申请日：2017-04-13
发明人： Etsushi YAMAZAKI , Hiroyukl NOUCHI , Yasuharu ONUMA , Tomohiro TAKAMUKU , Katsuichi OYAMA , Kazuhito TAKEI , Masahito TOMIZAWA , Yoshiaki KISAKA , Mltsuteru YOSHIDA , Masanori NAKAMURA
IPC分类号： H04B10/61
CPC分类号： H04B10/6164 , H04B10/61 , H04B10/615 , H04B10/6165 , H04L27/3836 , H04L2027/0024
摘要： A symbol phase difference compensating portion (6) calculates a first phase difference which is a phase difference between a known pattern extracted from a received signal and a true value of the known pattern and performs phase compensation for the received signal based on the first phase difference. A tentative determination portion (12) tentatively determines an output signal of the symbol phase difference compensating portion (6) to acquire an estimated value of a phase. A first phase difference acquiring portion (13) acquires a second phase difference which is a phase difference between a phase of the output signal and the estimated value of the phase acquired by the tentative determination portion (12). A first phase difference compensating portion (14) performs phase compensation for the output signal based on the second phase difference.
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公开(公告)号：US20190074903A1
公开(公告)日：2019-03-07
申请号：US16085483
申请日：2017-05-26
发明人： Tomohiro TAKAMUKU , Etsushi YAMAZAKI , Katsuichi OYAMA , Yasuharu ONUMA , Kazuhito TAKEI , Masanori NAKAMURA , Mitsuteru YOSHIDA , Masahito TOMIZAWA , Yoshiaki KISAKA
IPC分类号： H04B10/2507 , H04B10/61 , H04B3/10 , H04L27/01
摘要： A reception circuit includes a first adaptive compensator compensating distortion of a received signal. An adaptive compensation coefficient calculator includes a known-signal detector detecting first and second known-signals from the received signal, a second adaptive compensator compensating distortion of the received signal, a tap coefficient initial value calculator calculating an initial value of a tap coefficient of the second adaptive compensator by comparing the first known-signal with its true value, a first phase shift compensator compensating phase shift of an output of the second adaptive compensator using the second known-signal, and a tap coefficient calculator calculating tap coefficients of the first and second adaptive compensators by comparing at least one of the first and second known-signals compensated by the second adaptive compensator and the first phase shift compensator with its true value.
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公开(公告)号：US20190013876A1
公开(公告)日：2019-01-10
申请号：US15748892
申请日：2016-10-17
发明人： Kengo HORIKOSHI , Mitsuteru YOSHIDA , Seiji OKAMOTO , Eiichi HOSOYA , Etsushi YAMAZAKI , Yasuharu ONUMA , Tomohiro TAKAMUKU , Naoki MIURA , Sadayuki YASUDA
IPC分类号： H04B10/61 , H04B10/532 , H04J14/06
CPC分类号： H04B10/6166 , G02F1/21 , G02F2001/212 , H04B10/2513 , H04B10/2569 , H04B10/532 , H04B10/616 , H04B10/6161 , H04B10/6162 , H04B10/6164 , H04B10/6165 , H04B2210/252 , H04J14/06 , H04L27/0014 , H04L27/362 , H04L27/3818 , H04L27/3827 , H04L27/3863 , H04L2027/0026
摘要： A coherent optical reception device includes a local oscillation laser that supplies laser light, a coherent optical reception front-end unit that receives a multi-level modulated optical signal, demodulates the optical signal on the basis of the laser light, and converts a demodulated optical signal into an electrical analog signal, an analog-to-digital converter that converts the analog signal into a digital signal, a compensation unit that compensates for an influence of dispersion due to a wavelength or a polarized wave of the optical signal and recovers a carrier phase of the digital signal, a constellation distortion compensation unit that compensates for constellation distortion of the multi-level modulation included in the digital signal in which an influence of dispersion is compensated for by the compensation unit, and an error correction decoding unit that performs error correction of the digital signal in which the constellation distortion is compensated for.
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公开(公告)号：US20190165868A1
公开(公告)日：2019-05-30
申请号：US16092391
申请日：2017-06-21
发明人： Yasuharu ONUMA , Etsushi YAMAZAKI , Tomohiro TAKAMUKU , Masahiro TACHIBANA , Mitsuteru YOSHIDA , Masahito TOMIZAWA , Seiji OKAMOTO
摘要： Fourier transform is performed on a reception signal to obtain a first calculation value. Fourier transform is performed on a known signal to obtain a second calculation value. The first calculation value is divided by the second calculation value to obtain a third calculation value. Inverse Fourier transform is performed on the third calculation value to obtain a fourth calculation value. A maximum value of an amplitude of the fourth calculation value and a sample point at which the maximum value is obtained are detected. The position of the known signal in the reception signal is detected from the sample point at which the maximum value is obtained.
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6.发明申请公开(公告)号：US20180252614A1
公开(公告)日：2018-09-06
申请号：US15555321
申请日：2016-10-04
发明人： Etsushi YAMAZAKI , Tomohiro TAKAMUKU , Yuki YOSHIDA , Mitsuteru YOSHIDA , Koki SHIBAHARA , Kengo HORIKOSHI , Yoshiaki KISAKA
IPC分类号： G01M11/02 , H04B10/079 , H04B10/2513 , H04B3/06 , G01M11/00
摘要： A Fourier-transformer performs Fourier transform on a filter coefficient output from an adaptive equalizer which comprises a finite impulse response filter of N taps (N represents an integer of 2 or more) in a time direction. An eigenvalue sum calculator integrates a frequency-differentiation result of the Fourier-transformed filter coefficient and a complex conjugate of the Fourier-transformed filter coefficient to calculate a matrix, and calculates a sum of two eigenvalues of the matrix. A proportionality factor calculator calculates a proportionality factor for frequency from the sum of the two eigenvalues.
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公开(公告)号：US20220303012A1
公开(公告)日：2022-09-22
申请号：US17596617
申请日：2020-06-10
IPC分类号： H04B10/2569 , H04B10/61 , H04B3/06
摘要： An adaptive equalizer (70) according to this invention includes an adaptive equalization filter (71) configured to adaptively compensate for a waveform distortion caused by a polarization fluctuation of a received signal (61) by updating a tap coefficient, a first tap coefficient updater (72) configured to calculate the tap coefficient according to the polarization fluctuation of the received signal (61) using a variable step size and update the tap coefficient of the adaptive equalization filter (71), a second tap coefficient updater (73) configured to calculate the tap coefficient according to the polarization fluctuation of the received signal (61) using a fixed step size μ0, a polarization state estimator (74) configured to estimate a polarization state of the received signal (61) using the tap coefficient calculated by the second tap coefficient updater (73), and a step size updater (75) configured to obtain the step size corresponding to the polarization state estimated by the polarization state estimator (74) and update the variable step size. According to this invention, it is possible to provide an adaptive equalizer that always implements stable followability to various SOP fluctuations.
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公开(公告)号：US20210344424A1
公开(公告)日：2021-11-04
申请号：US17273544
申请日：2019-10-07
发明人： Tomohiro TAKAMUKU , Mitsuteru YOSHIDA , Tsutomu TAKEYA , Kazuhito TAKEI , Katsuichi OYAMA , Tomoharu SEMBOKU
IPC分类号： H04B10/2569 , H04B10/61
摘要： First compensation circuitry includes a first digital filter compensating a phase difference between a phase of a symbol of a received signal and a sampling timing, and first filter coefficient calculation circuitry calculating a filter coefficient of the first digital filter as a first filter coefficient. Second filter coefficient calculation circuitry calculates, as a second filter coefficient, a filter coefficient for adaptive equalization that compensates distortion due to temporally changing polarization dispersion, based on an output of the first digital filter. Coefficient combination circuitry combines the first filter coefficient and the second filter coefficient. Second compensation circuitry includes a second digital filter which uses a filter coefficient combined by the coefficient combination circuitry and performs a compensation of the phase difference between the phase of the symbol of the received signal and the sampling timing, and a process of the adaptive equalization at the same time.
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9.发明申请公开(公告)号：US20210273732A1
公开(公告)日：2021-09-02
申请号：US17255156
申请日：2019-07-22
发明人： Tomohiro TAKAMUKU , Mitsuteru YOSHIDA , Tsutomu TAKEYA , Katsuichi OYAMA , Hiroyuki NOUCHI , Atsushi SUENAGA
摘要： A known pattern comparison type phase difference detection unit (12) detects a phase difference between a known pattern extracted from a received signal and a true value of the known pattern as a first phase difference. M indicates the number of modulation phases in a phase modulation method of the received signal. An M-th power type phase difference detection unit (13) removes a modulation component by raising the received signal to M-th power, and detects phase variation from a modulation phase point used for mapping on a transmission side, as a second phase difference. A phase compensation unit (11) compensates phase variation of the received signal based on an addition result of the first phase difference and the second phase difference.
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公开(公告)号：US20190036613A1
公开(公告)日：2019-01-31
申请号：US16069852
申请日：2017-04-26
发明人： Tomohiro TAKAMUKU , Etsushi YAMAZAKI , Yuki YOSHIDA , Katsuichi OYAMA , Yasuharu ONUMA , Akihiro YAMAGISHI
IPC分类号： H04B10/61 , H04B10/2507 , H04B10/077 , H04L27/01
CPC分类号： H04B10/2507 , H04B3/10 , H04B10/0775 , H04B10/61 , H04B10/616 , H04B2210/074 , H04B2210/252 , H04L27/01 , H04L27/26
摘要： In a method in which a compensation coefficient calculating portion (6) calculates a compensation coefficient of a compensation portion (5) which compensates transmission characteristics of a signal, a known signal is extracted from the signal. Next, a pseudo-random number is added to the extracted known signal. Next, the compensation coefficient is calculated by comparing a true value of the known signal with the known signal to which the pseudo-random number is added.
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