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1.发明授权公开(公告)号：US11876554B2
公开(公告)日：2024-01-16
申请号：US17865164
申请日：2022-07-14
发明人： Masashi Binkai , Tsuyoshi Yoshida
IPC分类号： H04B10/00 , H04B10/077 , H04B10/073 , H04B10/43 , H04B10/50 , H04J14/02 , H04J14/00
CPC分类号： H04B10/077 , H04B10/0731 , H04B10/43 , H04B10/50 , H04J14/02
摘要： An optical transceiver includes processing circuitry to calculate, when test signals are sent to a transmission line from a transmitter and a receiver receives the test signals having passed through a wavelength filter, a bandwidth of the received test signals, the transmitter generating, as the test signals, a collection of narrowband signals, the narrowband signals having a narrower bandwidth than a bandwidth of the wavelength filter and having different frequencies, and the wavelength filter included in an optical splitter inserted in the transmission line, and the collection of narrowband signals including a narrowband signal having a higher frequency than a highest frequency in the bandwidth of the wavelength filter and a narrowband signal having a lower frequency than a lowest frequency in the bandwidth of the wavelength filter, and to determine a modulation rate and a modulation level of the transmission signal depending on the calculated bandwidth.
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公开(公告)号：US11271658B2
公开(公告)日：2022-03-08
申请号：US17147234
申请日：2021-01-12
摘要： A coherent receiver performing coherent detection on polarization multiplex light into which first polarization light and second polarization light are multiplexed, and splitting the polarization multiplex light into the first polarization light and the second polarization light, an adaptive equalizer compensating the waveform distortion of a signal superimposed onto the first polarization light by using a first FIR filter, compensating the waveform distortion of a signal superimposed onto the second polarization light by using a second FIR filter, and by decoding each of the signals whose waveform distortion has been compensated, generating their respective decoded data, an error ratio calculator calculating the bit error ratio of each decoded data generated by the adaptive equalizer, a margin calculator calculating a margin from the bit error ratio of an error correction limit in each bit error ratio calculated by the error ratio calculator, and a tap number controller setting up the numbers of taps of the first and second FIR filters by referring to the respective margins calculated by the margin calculator are included.
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公开(公告)号：US10320486B1
公开(公告)日：2019-06-11
申请号：US15981052
申请日：2018-05-16
IPC分类号： H04B10/508 , H04B10/516
摘要： An encoder for generating an optical data code from a symbol performs a symbol mapping and an encoding, wherein the symbol mapping performs providing a first constellation format having first and second amplitude rings with circular grids corresponding to phase angles, providing a second constellation format having the first and second amplitude rings with the circular grids corresponding to the phase angles, applying a first part of the symbol to one of the first and second constellation formats to represent the first part of the symbol by one of the first and second amplitude rings with one of the circular grids, and applying a second part of the symbol to another one of the first and second constellation formats to represent the second part of the symbol by one of the first and second amplitude rings with one of the circular grids. The first and the second constellation can be mapped to subcarrier modulation in three different ways.
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公开(公告)号：US11757557B2
公开(公告)日：2023-09-12
申请号：US17547584
申请日：2021-12-10
发明人： Tsuyoshi Yoshida
IPC分类号： H04B10/25 , H04J14/02 , H04B10/2581 , H04L27/26 , H04L27/34
CPC分类号： H04J14/0298 , H04B10/2581 , H04L27/26 , H04L27/34
摘要： A subchannel encoding device is configured to include: a probability distribution shaping-encoding unit for dividing M×N (M is an integer of two or more, and N is an integer of one or more) subchannels into N groups, shaping a probability distribution of transmission modulation symbols of each group on the basis of signal-to-noise ratios of the M×N subchannels, and converting an information bit string into a shaped bit string corresponding to the probability distribution of the transmission modulation symbols of each group; a subchannel signal generating unit for generating each subchannel signal in the M×N subchannels from the shaped bit string; and a signal multiplexing unit for multiplexing the M×N subchannel signals generated by the subchannel signal generating unit to generate a subchannel multiplexed signal.
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公开(公告)号：US11736127B2
公开(公告)日：2023-08-22
申请号：US17405461
申请日：2021-08-18
CPC分类号： H03M13/45 , H04B10/6165 , H04L27/38
摘要： Provided is an optical transmission device including: a symbol demapping unit; a likelihood generation circuit configured to generate likelihoods relating to the reception signal; and an error correction decoding unit configured to execute soft decision decoding. The likelihood generation circuit includes: a first one-dimensional-modulation lookup table configured to input the signal of the I-axis component as an argument to output a first likelihood; a second one-dimensional-modulation lookup table configured to input the signal of the Q-axis component as an argument to output a second likelihood; and a two-dimensional-modulation lookup table configured to input, as an argument, the signal being the concatenation of the signal of the I-axis component and the signal of the Q-axis component, to generate a third likelihood. The error correction decoding unit is configured to execute the soft decision decoding based on the first likelihood, the second likelihood, and the third likelihood.
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公开(公告)号：US11496222B2
公开(公告)日：2022-11-08
申请号：US17406833
申请日：2021-08-19
发明人： Keisuke Matsuda , Tsuyoshi Yoshida
IPC分类号： H04B10/532 , H04B10/61 , H04B10/556
摘要： A spatial optical transmitter modulates an optical signal of a single wavelength in accordance with a signal to be transmitted, divides the modulated optical signal into two, rotates polarizations of the two divided optical signals, and transmits the two optical signals as optical signals of two orthogonal polarizations to space.
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公开(公告)号：US11212145B2
公开(公告)日：2021-12-28
申请号：US16479139
申请日：2017-03-16
发明人： Masashi Binkai , Tsuyoshi Yoshida
IPC分类号： H04L25/49 , H04L27/04 , H04B10/54 , H04B10/524 , H04L27/36
摘要： A signal shaping device includes: a generation unit to perform plural types of predetermined processes on blocks obtained by dividing plural sequences of bit strings by a predetermined length, and generate a plurality of candidate blocks that are candidates for a shaped block to be transmitted; a calculation unit to calculate, on a candidate-block-by-candidate-block basis, a weight of a one-dimensional modulation symbol when a plurality of bits included in the candidate block are converted into the one-dimensional modulation symbol; a selection unit to select, from among the candidate blocks, the shaped block on a basis of the weight; an addition unit to add, to the shaped block, selection information indicating a selection result; and a symbol mapping unit to generate a one-dimensional modulation signal by converting a plurality of bits included in the shaped block, into the one-dimensional modulation symbol.
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公开(公告)号：US10652071B2
公开(公告)日：2020-05-12
申请号：US16486127
申请日：2017-03-22
发明人： Keisuke Matsuda , Keisuke Dohi , Tsuyoshi Yoshida
摘要： A symbol mapping device includes a transmission data processing unit receiving two transmission data having the same length, and if the length is a first length, uses the two transmission data as two output data without change, and if the length is less than the first length, adds dummy data to the two transmission data to generate two output data, each data having the first length; a parity addition unit generating two parity-added transmission data based on the two output data, where the two parity-added transmission data each contain parity data added to the transmission data and each have a second length; a shuffle unit extracting two modulation data, being data to be mapped, from the two parity-added transmission data generated by the parity addition unit; and a mapping processing unit mapping the two modulation data to two time slots of constellation points.
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公开(公告)号：US09806739B1
公开(公告)日：2017-10-31
申请号：US15372611
申请日：2016-12-08
IPC分类号： H03M1/00 , H03M7/30 , H04B10/516 , H04B10/508
CPC分类号： H03M7/30 , H04B10/5053 , H04B10/508 , H04B10/516 , H04B10/5161 , H04B10/541 , H04B10/5561 , H04J14/06
摘要： An optical data coding method includes at least steps of selecting a modulation scheme comprising an X-polarization constellation format having first and second amplitude rings with circular grids corresponding to predetermined phase angles and a Y-polarization constellation format having the first and second amplitude rings with the circular grids corresponding to the predetermined phase angles, arranging a first part of the symbol on a first circular grid of the first amplitude ring on the X-polarization constellation format, and arranging a second part of the symbol on a second circular grid of the second amplitude ring on the Y-polarization constellation format.
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公开(公告)号：US11695523B2
公开(公告)日：2023-07-04
申请号：US17369266
申请日：2021-07-07
发明人： Tsuyoshi Yoshida
IPC分类号： H04L5/00
CPC分类号： H04L5/0046
摘要： In a distribution shaping method, information compression and distribution shaping are executed at the same time. A symbol sequence of a predetermined length is allocated to an input bit sequence of a predetermined length on a one-to-one basis. In the allocation, a bit sequence smaller in entropy is allocated a symbol sequence smaller in average power.
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