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公开(公告)号：US11923862B2
公开(公告)日：2024-03-05
申请号：US17311646
申请日：2019-12-04
摘要： A first reception processing unit performs a process of receiving a first signal transmitted on a first transmission line, a second reception processing unit performs a process of receiving a second signal transmitted on a second transmission line, and an output speed control unit controls output speeds of the first signal and the second signal subjected to the reception process. A system switching unit selects and outputs the first signal or the second signal subjected to a reception process, and an output processing unit performs a process for output to another apparatus on the output from the system switching unit. A reception side clock output unit outputs a clock signal giving a processing timing of each process, and a clock frequency control unit adjusts a frequency of the clock signal giving the processing timing to the output processing unit. A frequency adjustment range calculation unit calculates an adjustment range of the frequency based on frequency deviation accuracy of the reception side clock output unit, frequency deviation accuracy of a transmission side clock output unit that outputs a clock signal giving a processing timing to a transmission process at a transmission apparatus on the transmission side, and a prescribed value of a frequency deviation.
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公开(公告)号：US10523335B2
公开(公告)日：2019-12-31
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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公开(公告)号：US09698932B2
公开(公告)日：2017-07-04
申请号：US14778824
申请日：2014-03-14
IPC分类号： H04J14/06 , H04B10/077 , H04B10/516 , H04B10/532 , H04B10/61 , H04L27/20 , H04B10/50
CPC分类号： H04J14/06 , H04B10/077 , H04B10/50 , H04B10/516 , H04B10/532 , H04B10/614 , H04B10/6162 , H04L27/2096
摘要： An optical transmission and reception system includes a transmitter and receiver. The transmitter differentially encodes control information to generate a differentially coded signal; uses the differentially coded signal to modulate a signal sequence in which electricity concentrates at a particular frequency; applies time-division multiplexing on the modulated signal sequence and a primary signal in one of two polarized wave components, and applies time-division multiplexing on the other polarized wave components and the signal sequence itself; and polarization-multiplexes the both of the time-division multiplexed polarized waves into an optical signal; and transmits the optical signal to the receiver. The receiver polarization-demultiplexes the received optical signal to generate two polarized wave signals; extracts the signal sequence in which electricity concentrates at the particular frequency from the two polarized wave signals; and applies differential detection on the extracted signal sequence to demodulate the control information.
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公开(公告)号：US10305675B2
公开(公告)日：2019-05-28
申请号：US15568696
申请日：2017-01-16
发明人： Yasuharu Onuma , Masahiro Tachibana , Etsushi Yamazaki , Kazuhito Takei , Yuki Yoshida , Masayuki Ikeda , Yoshiaki Kisaka , Masahito Tomizawa
摘要： An FIR filter convolutes sampled data obtained by sampling a reception signal with tap coefficients. A phase difference detector detects a phase difference between a synchronization timing of a signal waveform estimated from an output signal of the FIR filter and a sampling timing of the output signal. A tap coefficient adjuster adjusts the tap coefficients so as to reduce the phase difference detected by the phase difference detector and causes the sampling timing of the output signal of the FIR filter to track the synchronization timing.
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公开(公告)号：US10171173B2
公开(公告)日：2019-01-01
申请号：US15122582
申请日：2015-03-17
发明人： Seiji Okamoto , Koichi Ishihara , Etsushi Yamazaki , Mitsuteru Yoshida , Tomoyoshi Kataoka , Kazushige Yonenaga , Yoshiaki Kisaka , Masanori Nakamura , Masahito Tomizawa
IPC分类号： H04B10/50 , H04B10/516 , H04B10/2513 , H04L27/34 , H04B10/508 , H04B10/077 , H04B10/2557 , H04L27/36
摘要： An optical signal transmission apparatus includes a modulation unit which modulates a transmission signal, a training signal sequence generation unit which generates a plurality of signal sequences having power concentrated in a plurality of different frequency bands, at least one of an amplitude and a phase of the plurality of signal sequences being modulated, as a training signal sequence, a signal multiplexing unit which appends the training signal sequence to the transmission signal, and an electro-optical conversion unit which converts a signal sequence obtained by appending the training signal sequence to the transmission signal into an optical signal and transmits the optical signal.
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公开(公告)号：US10122465B2
公开(公告)日：2018-11-06
申请号：US15575286
申请日：2016-09-05
IPC分类号： H04B10/516 , H04B10/50 , H04B10/60 , H04B10/40
摘要： Signal processing sections selectively switch modulation/demodulation in low-efficiency modulation system and modulation/demodulation in high-efficiency modulation system, and perform digital signal processing. Parallel-side interfaces of input/output interface sections are electrically connected to the signal processing section. A serial-side interface of the input/output interface section is electrically connected to a serial-side interface of the input/output interface section. A selection section electrically connects a parallel-side interface of the input/output interface section to the signal processing section when the low-efficiency modulation system is selected, and electrically connects the parallel-side interface of the input/output interface section to a parallel-side interface of the input/output interface section when the high-efficiency modulation system is selected.
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公开(公告)号：US11916685B2
公开(公告)日：2024-02-27
申请号：US17293743
申请日：2019-11-18
IPC分类号： H04L29/08 , H04L1/22 , H04L1/00 , H04L1/1607
CPC分类号： H04L1/22 , H04L1/0041 , H04L1/0045 , H04L1/1607
摘要： A transmission apparatus includes redundant first communication devices configured to communicate with a communication apparatus provided in a first network, and redundant second communication devices configured to communicate with a communication apparatus provided in a second network. The second communication devices include respective first ends that are ends of redundant communication paths of the first communication devices, and the first communication devices include respective second ends that are ends of redundant communication paths of the second communication devices.
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公开(公告)号：US11683093B2
公开(公告)日：2023-06-20
申请号：US17614686
申请日：2019-06-06
发明人： Masanori Nakamura , Seiji Okamoto , Kengo Horikoshi , Shuto Yamamoto , Takayuki Kobayashi , Yoshiaki Kisaka , Masahito Tomizawa
IPC分类号： H04B10/06 , H04B10/2513 , H03H17/02 , H04B10/61
CPC分类号： H04B10/2513 , H03H17/0213 , H04B10/61 , H04B10/616
摘要： An electric digital received signal obtained from a received optical signal is segmented into blocks of a certain length with an overlap of a length determined in advance with an adjacent block. Fourier transformation is performed for each of the blocks. The blocks subjected to the Fourier transformation are stored consecutively in time series, a coefficient determined based on a wavelength dispersion compensation amount according to one of frequency positions and a delay amount according to one of the frequency positions and one of time positions is applied to each of frequency component values included in a plurality of the stored blocks, and the blocks to which the coefficient has been applied and which are obtained by adding up the frequency component values to which the coefficient has been applied for each of the frequency positions are generated. Inverse Fourier transformation is performed on the generated blocks to which the coefficient has been applied. A part of the overlap subjected to the inverse Fourier transformation is removed.
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公开(公告)号：US10374718B2
公开(公告)日：2019-08-06
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： H04B10/60 , H04B10/40 , H04B10/58 , H04B10/61 , H04B10/516
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：US09667350B2
公开(公告)日：2017-05-30
申请号：US14758941
申请日：2014-01-24
发明人： Kengo Horikoshi , Kohki Shibahara , Etsushi Yamazaki , Mitsuteru Yoshida , Koichi Ishihara , Takayuki Kobayashi , Yoshiaki Kisaka , Takuya Ohara , Masahito Tomizawa , Tomoyoshi Kataoka
CPC分类号： H04B10/6165 , H04L7/0041 , H04L7/0075 , H04L27/066 , H04L27/389
摘要： The optical receiving device with phase compensation apparatus uses coherent opto-electric conversion and is designed for receiving phase- or quadrature-amplitude-modulated optical signals. The phase compensation apparatus includes following elements: a carrier-phase estimation unit that estimates carrier phase errors in a received symbol string; a gain adjustment unit that adjusts weighting of each symbols in phase error evaluation performed in the carrier-phase adjustment unit; a phase-cycle-slip reduction unit with a phase-cycle-slip detector using statistical processing performed on the output symbols from the carrier-phase estimation unit; and a phase compensation circuit that compensates carrier phase errors of the received signal using an output from the carrier phase estimation unit.
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