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1.发明公开
公开(公告)号：EP3588806A1
公开(公告)日：2020-01-01
申请号：EP18774323.2
申请日：2018-03-26
IPC分类号： H04B10/077 , H04J11/00
摘要： A signal-to-noise ratio (SNR) estimation method includes an optical signal transmission step of inserting at least one pair of signal sequences into transmission data and transmitting the transmission data into which the at least one pair of signal sequences is inserted, a signal sequence extraction step of extracting the at least one pair of signal sequences from a received signal obtained by receiving the transmitted transmission data, an inner product calculation step of calculating an inner product value of the extracted at least one pair of signal sequences, a reception power calculation step of calculating reception power of the extracted at least one pair of signal sequences, and an SNR calculation step of calculating an SNR of the at least one pair of signal sequences on the basis of the calculated inner product value and the calculated reception power.
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公开(公告)号：EP3367594A1
公开(公告)日：2018-08-29
申请号：EP16857401.0
申请日：2016-10-17
发明人： HORIKOSHI Kengo , YOSHIDA Mitsuteru , OKAMOTO Seiji , HOSOYA Eiichi , YAMAZAKI Etsushi , ONUMA Yasuharu , TAKAMUKU Tomohiro , MIURA Naoki , YASUDA Sadayuki
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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3.发明公开OPTICAL TRANSMISSION SYSTEM, PHASE COMPENSATION METHOD, AND OPTICAL RECEPTION DEVICE 有权OPTISCHESÜBERTRAGUNGSSYSTEM，PHASENKOMPENSATIONSVERFAHREN UND OPTISCHE EMPFANGSVORRICHTUNG
公开(公告)号：EP2942917A1
公开(公告)日：2015-11-11
申请号：EP14752142.1
申请日：2014-02-13
发明人： YOSHIDA Mitsuteru , YAMAZAKI Etsushi , OKAMOTO Seiji , UZAWA Hiroyuki , HORIKOSHI Kengo , ISHIHARA Koichi , KOBAYASHI Takayuki , KISAKA Yoshiaki , TOMIZAWA Masahito , FUJIWARA Naoki , KATAOKA Tomoyoshi , YONENAGA Kazushige
IPC分类号： H04L27/38 , H04B10/2507 , H04B10/61
CPC分类号： H04B10/6165 , H04B10/2507 , H04B10/516 , H04B10/61 , H04J14/06 , H04L27/38 , H04L2027/0067 , H04L2027/0095
摘要： An increase in circuit scale is suppressed and a phase variation caused in a transmission path or the like is compensated for. An optical transmission system includes: a pilot symbol detection unit which detects a plurality of pilot symbols intermittently inserted into a received complex electric field signal that is obtained through coherent detection for a received optical signal; an error signal computation unit which calculates a complex electric field error signal indicating a phase variation at each pilot symbol based on the pilot symbols detected by the pilot symbol detection unit and a predetermined reference symbol; a compensation electric field signal generation unit which estimates a phase variation between the pilot symbols in the received complex electric field signal using filter processing based on the complex electric field error signal calculated by the error signal computation unit; and a phase noise compensation unit which performs phase compensation for the received complex electric field signal based on the phase variation between the pilot symbols estimated by the compensation electric field signal generation unit.
摘要翻译： 抑制电路规模的增加，并补偿在传输路径等中引起的相位变化。 光传输系统包括：导频符号检测单元，其检测间接插入到通过接收的光信号的相干检测获得的接收复电场信号中的多个导频符号; 误差信号计算单元，其基于由导频符号检测单元检测的导频符号和预定的参考符号来计算指示每个导频符号的相位变化的复电场误差信号; 补偿电场信号生成单元，其基于由所述误差信号计算单元计算出的复电场误差信号，使用滤波处理来估计所述接收复电场信号中的导频符号之间的相位变化; 以及相位噪声补偿单元，其基于由补偿电场信号生成单元估计的导频符号之间的相位变化，对接收到的复数电场信号进行相位补偿。
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公开(公告)号：EP3367594B1
公开(公告)日：2020-10-07
申请号：EP16857401.0
申请日：2016-10-17
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公开(公告)号：EP3094015B1
公开(公告)日：2019-11-20
申请号：EP15765440.1
申请日：2015-03-17
发明人： OKAMOTO Seiji , ISHIHARA Koichi , YAMAZAKI Etsushi , YOSHIDA Mitsuteru , KATAOKA Tomoyoshi , YONENAGA Kazushige , KISAKA Yoshiaki , NAKAMURA Masanori , TOMIZAWA Masahito
IPC分类号： H04B10/077 , H04B10/2513 , H04B10/516 , H04J11/00 , H04L27/20 , H04L27/36 , H04B10/2557 , H04L27/34
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公开(公告)号：EP3451539A1
公开(公告)日：2019-03-06
申请号：EP17815394.6
申请日：2017-06-20
IPC分类号： H03M13/45 , H03M13/29 , H04B10/2581 , H04B10/516 , H04L27/00
摘要： An optical receiver includes: a first calculation unit that obtains a log likelihood ratio for each M-dimension (M is a natural number), based on a received signal; and a second calculation unit that obtains a log likelihood ratio of an N dimensional symbol (N is a natural number), based on the log likelihood ratio for each M-dimension.
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公开(公告)号：EP2942917B1
公开(公告)日：2018-05-23
申请号：EP14752142.1
申请日：2014-02-13
发明人： YOSHIDA Mitsuteru , YAMAZAKI Etsushi , OKAMOTO Seiji , UZAWA Hiroyuki , HORIKOSHI Kengo , ISHIHARA Koichi , KOBAYASHI Takayuki , KISAKA Yoshiaki , TOMIZAWA Masahito , FUJIWARA Naoki , KATAOKA Tomoyoshi , YONENAGA Kazushige
IPC分类号： H04L27/38 , H04B10/2507 , H04B10/61
CPC分类号： H04B10/6165 , H04B10/2507 , H04B10/516 , H04B10/61 , H04J14/06 , H04L27/38 , H04L2027/0067 , H04L2027/0095
摘要： An increase in circuit scale is suppressed and a phase variation caused in a transmission path or the like is compensated for. An optical transmission system includes: a pilot symbol detection unit which detects a plurality of pilot symbols intermittently inserted into a received complex electric field signal that is obtained through coherent detection for a received optical signal; an error signal computation unit which calculates a complex electric field error signal indicating a phase variation at each pilot symbol based on the pilot symbols detected by the pilot symbol detection unit and a predetermined reference symbol; a compensation electric field signal generation unit which estimates a phase variation between the pilot symbols in the received complex electric field signal using filter processing based on the complex electric field error signal calculated by the error signal computation unit; and a phase noise compensation unit which performs phase compensation for the received complex electric field signal based on the phase variation between the pilot symbols estimated by the compensation electric field signal generation unit.
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公开(公告)号：EP2930867A1
公开(公告)日：2015-10-14
申请号：EP14742856.9
申请日：2014-01-24
发明人： HORIKOSHI Kengo , SHIBAHARA Kohki , YAMAZAKI Etsushi , YOSHIDA Mitsuteru , ISHIHARA Koichi , KOBAYASHI Takayuki , KISAKA Yoshiaki , OHARA Takuya , TOMIZAWA Masahito , KATAOKA Tomoyoshi
IPC分类号： H04B10/61
CPC分类号： H04B10/6165 , H04L7/0041 , H04L7/0075 , H04L27/066 , H04L27/389
摘要： An optical receiving device receives an optical signal that has been modulated by means of phase modulation or quadrature amplitude modulation, converts the received optical signal into an electrical signal using coherent detection, and performs phase compensation on the converted received signal, and includes: a carrier phase estimation unit that estimates carrier phase errors in a received symbol string obtained from the received signal; a gain adjustment unit that performs gain adjustment on symbols input into the carrier phase adjustment unit; a phase cycle slip reduction unit that, by performing statistical processing on an output from the carrier phase estimation unit, detects general noise that causes a phase cycle slip, and reduces the phase cycle slip; and a phase compensation circuit that compensates carrier phase errors contained in the received signal using an output from the carrier phase estimation unit.
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9.发明公开
公开(公告)号：EP4351039A1
公开(公告)日：2024-04-10
申请号：EP21944098.9
申请日：2021-06-02
IPC分类号： H04B10/516
摘要： According to an aspect of the present invention, an optical signal control apparatus controls a compensation coefficient of an equalizer of an optical transmitter including the equalizer of a symbol period interval and a digital-to-analog converter (DAC) operating at a symbol period interval sampling rate and having a sampling phase adjustment function, and the sampling phase of the DAC. The optical signal control apparatus includes a skew calculation unit configured to calculate a sampling phase amount from a group delay difference between an in-phase component and a quadrature component based on characteristic information of a device and a transmission path and to output the calculated sampling phase amount to the DAC and a compensation coefficient calculation unit configured to calculate the compensation coefficient in which a phase characteristic of a Nyquist frequency of the DAC is 0 or an integer multiple of π and to output the calculated compensation coefficient to the equalizer.
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10.发明公开
公开(公告)号：EP3493429A1
公开(公告)日：2019-06-05
申请号：EP17834405.7
申请日：2017-07-26
发明人： HORIKOSHI Kengo , OKAMOTO Seiji , MATSUSHITA Asuka , YOSHIDA Mitsuteru , HAMAOKA Fukutaro , YAMADA Yoshiaki , KISAKA Yoshiaki
IPC分类号： H04B10/077 , H04B1/707 , H04B10/516 , H04J14/08
摘要： An optical transmitter of an optical data transmission system transmitting data through an optical fiber transmission path includes a main signal generator that converts first transmission data into a predetermined signal format to generate a first signal, a DCSK modulator that DCSK-modulates second transmission data to generate a second signal, a signal-multiplexer that performs time-division multiplexing of the first signal and the second signal, and an electro-optical converter that converts a multiplexed signal obtained by the time-division multiplexing of the signal-multiplexer from an electric signal into an optical signal, and outputs the optical signal to the optical fiber transmission path.
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