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公开(公告)号：US11728889B2
公开(公告)日：2023-08-15
申请号：US17782957
申请日：2019-12-16
IPC分类号： H04B10/2543 , H04B10/61
CPC分类号： H04B10/2543 , H04B10/6161
摘要： An optical reception device includes a coefficient update section which optimizes a dispersion coefficient used in compensation of wavelength dispersion of a received signal obtained by receiving an optical signal according to a coherent detection method and a phase rotation amount used in compensation of a nonlinear optical effect of the received signal, and a transmission characteristic estimation section which estimates a transmission characteristic of a transmission line by using the optimized dispersion coefficient and the optimized phase rotation amount.
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公开(公告)号：US11799557B2
公开(公告)日：2023-10-24
申请号：US17637691
申请日：2019-08-26
CPC分类号： H04B10/541 , H04L27/2605 , H04L27/2613
摘要： A communication device includes an amplitude conversion unit configured to generate a symbol sequence according to a bit sequence, a distribution matching unit configured to add redundant bits to the symbol sequence through probabilistic amplitude shaping (PAS) coding, an insertion unit configured to insert a pilot symbol into the symbol sequence to which the redundant bits have been added and transmit the symbol sequence into which the pilot symbol has been inserted to a transmission path, and a control unit configured to acquire information on the transmission path and change, according to the information on the transmission path, allocation of the redundancy of the PAS coding and the redundancy of the pilot symbol in a range of redundancy that is able to be allocated depending on a predetermined throughput.
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公开(公告)号：US11716149B2
公开(公告)日：2023-08-01
申请号：US17435105
申请日：2020-03-02
发明人： Takeo Sasai , Fukutaro Hamaoka
CPC分类号： H04B10/6163
摘要： An optical reception device includes a nonlinear optical compensation section which performs compensation of wavelength dispersion of a received signal obtained by receiving an optical signal according to a coherent detection method and compensation of a nonlinear optical effect of the received signal N (N is an integer of at least 1) step(s), and a coefficient update section which updates a coefficient so as to optimize the coefficient used in each step of the nonlinear optical compensation section based on a signal having been subjected to the compensation by the nonlinear optical compensation section and a predetermined training signal.
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公开(公告)号：US11632185B2
公开(公告)日：2023-04-18
申请号：US17433149
申请日：2020-01-31
IPC分类号： H04L27/01 , H04J14/06 , H04B10/2507 , H04B10/61 , H04L27/38
摘要： A receiver convolutes each of a real component and an imaginary component of each polarization of a polarization-multiplexed reception signal with an impulse response for compensating for frequency characteristics of the receiver and a complex impulse response for wavelength dispersion compensation, and generates, as input signals, the convoluted real component and imaginary component of each polarization and phase conjugations thereof, for each polarization. The receiver generates, for each polarization, a first addition signal obtained by multiplying each of the real component and the imaginary component of each polarization by a complex impulse response, thereafter adding together the multiplied real component and imaginary component, and applying a phase rotation for frequency offset compensation to the added components, and a second addition signal obtained by multiplying each of the phase conjugation of the real component of and the phase conjugation of the imaginary component of each polarization by a complex impulse response, thereafter adding together the multiplied phase conjugations, and applying a phase rotation opposite to the phase rotation for frequency offset compensation to the added phase conjugations, and adds or subtracts a transmission data bias correction signal to or from a signal obtained by adding together the generated first addition signal and second addition signal.
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公开(公告)号：US11870489B2
公开(公告)日：2024-01-09
申请号：US17766994
申请日：2019-10-09
IPC分类号： H04B10/079 , H04B17/15 , H04B17/336
CPC分类号： H04B10/079 , H04B17/15 , H04B17/336
摘要： A tentative decision is made for symbols on the basis of a received signal and a decision threshold, and a tentative decision signal including a sequence of the symbols is output. A scale value indicating a rate of increase or reduction of the received signal or a threshold change rate indicating a degree of change in the decision threshold is updated so that an appearance frequency of each of symbols included in the tentative decision signal matches an appearance frequency of each of symbols in a reference signal obtained by modulating a transmitted signal with a modulation method used in transmission which is shared between a transmitting side and a receiving side, and an SN ratio is calculated using the scale value or the threshold change rate when a degree of agreement between the appearance frequencies is within a predetermined permissible range. When the scale value is updated, a tentative decision is made for the symbols on the basis of the received signal increased or reduced by the updated scale value and the decision threshold, and when the threshold change rate is updated, the tentative decision for the symbols is made on the basis of the received signal and the decision threshold to which the updated threshold change rate is applied.
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公开(公告)号：US11463169B2
公开(公告)日：2022-10-04
申请号：US17425994
申请日：2020-01-15
IPC分类号： H04B10/2507
摘要： A wavelength dispersion amount estimation apparatus includes a correlation signal generation unit configured to generate, from a receive signal, a first signal including a main signal of the receive signal and a second signal, which includes an image signal corresponding to the main signal, with a shift by a baud rate of the receive signal relative to the first signal in a frequency domain, a correlation calculation unit configured to calculate a cross correlation of the first signal and the second signal, and a dispersion amount calculation unit configured to calculate a wavelength dispersion amount, based on a position of a peak of the cross correlation.
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公开(公告)号：US11444699B2
公开(公告)日：2022-09-13
申请号：US17424766
申请日：2020-01-15
发明人： Akira Masuda , Fukutaro Hamaoka , Shuto Yamamoto , Seiji Okamoto , Kengo Horikoshi , Masanori Nakamura , Asuka Matsushita , Yoshiaki Kisaka
IPC分类号： H04B10/69 , H04B10/548 , H04B10/67
摘要： There are provided an optical transmission apparatus that subjects a transmission signal including a plurality of sequences to Hadamard transform to obtain a signal in which a predetermined delay is added to one of the sequences, optically modulates the obtained signal, and transmits the modulated signal, and an optical reception apparatus that demodulates a reception signal received from the optical transmission apparatus by subjecting the reception signal to adaptive equalization processing with a predetermined number of taps. The optical reception apparatus includes: an adaptive equalization processing unit that subjects the reception signal to adaptive equalization processing of wavelength distortion compensation with a number of taps obtained by subtracting a number in accordance with the delay from the predetermined number of taps; a delay compensation unit that subjects the reception signal subjected to the wavelength distortion compensation to delay compensation in accordance with the delay; and an inverse Hadamard transform unit that subjects the reception signal subjected to the delay compensation to inverse Hadamard transform.
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公开(公告)号：US09692543B2
公开(公告)日：2017-06-27
申请号：US15027610
申请日：2014-09-11
发明人： Toshiya Matsuda , Fukutaro Hamaoka , Akira Naka , Kohei Saito
IPC分类号： H04B10/00 , H04B10/12 , H04B14/06 , H04J14/02 , H04B10/61 , H04B10/556 , H04B10/532
CPC分类号： H04J14/02 , H04B10/532 , H04B10/5561 , H04B10/6151 , H04B10/6161 , H04B10/6164 , H04B10/6165 , H04J14/06
摘要： A receiver is configured to have two coherent receivers using two pieces of local oscillator of optical frequencies f11 and f12 close to optical frequency f1 of signal light, the two pieces of local oscillator being controlled to have a predetermined optical frequency spacing ΔF, and a digital signal processor demodulating transmission data signal sequences based on outputs from the coherent receivers. When the frequency difference Δf1 of one of the two pieces of local oscillator from a virtual reference frequency f1′ close to the optical frequency f1 of the signal light is set, the digital signal processor obtains the frequency difference Δf2 of the other of the two pieces of local oscillator by calculating Δf1−ΔF, inputs electric signals output from the two coherent receivers, and compensates the phase rotation caused in the electric signals by frequency differences Δf1 and Δf2.
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公开(公告)号：US20220294535A1
公开(公告)日：2022-09-15
申请号：US17637691
申请日：2019-08-26
摘要： A communication device includes an amplitude conversion unit configured to generate a symbol sequence according to a bit sequence, a distribution matching unit configured to add redundant bits to the symbol sequence through probabilistic amplitude shaping (PAS) coding, an insertion unit configured to insert a pilot symbol into the symbol sequence to which the redundant bits have been added and transmit the symbol sequence into which the pilot symbol has been inserted to a transmission path, and a control unit configured to acquire information on the transmission path and change, according to the information on the transmission path, allocation of the redundancy of the PAS coding and the redundancy of the pilot symbol in a range of redundancy that is able to be allocated depending on a predetermined throughput.
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公开(公告)号：US11283528B2
公开(公告)日：2022-03-22
申请号：US17272790
申请日：2019-08-27
发明人： Akira Masuda , Seiji Okamoto , Shuto Yamamoto , Fukutaro Hamaoka , Masanori Nakamura , Asuka Matsushita , Yoshiaki Kisaka
IPC分类号： H04B10/61 , H04B10/079 , H04J14/06
摘要： A digital coherent receiver includes: an adaptive equalizer configured to execute, using a first tap coefficient, adaptive equalization processing on a digital signal that corresponds to a signal; a first coefficient updating unit configured to update the first tap coefficient based on the digital signal on which the adaptive equalization processing has not been executed, the digital signal on which the adaptive equalization processing has been executed, and a first step size; a second coefficient updating unit configured to update a second tap coefficient based on the digital signal on which the adaptive equalization processing has not been executed, the digital signal on which the adaptive equalization processing has been executed, and a second step size; and a control unit configured to detect a fluctuation speed of a state of polarization of the digital signal based on the second tap coefficient, and change the first tap coefficient to the updated second tap coefficient if it is determined that the fluctuation speed is higher than or equal to a speed threshold.
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