公开(公告)号：EP3504810A1

公开(公告)日：2019-07-03

申请号：EP17768253.1

申请日：2017-08-22

申请人： Mitsubishi Electric Corporation

发明人： PAJOVIC, Milutin ,  PARSONS, Kieran ,  MILLAR David ,  AKINO, Toshiaki ,  KOJIMA, Keisuke

IPC分类号： H04B10/2507 ,  H04B10/61

公开(公告)号：EP3462642A1

公开(公告)日：2019-04-03

申请号：EP18191440.9

申请日：2018-08-29

申请人： FUJITSU LIMITED

发明人： YAMAUCHI, Tomohiro ,  TANIMURA, Takahito ,  HOSHIDA, Takeshi ,  PUERTA RAMIREZ, Rafael

IPC分类号： H04B10/2507 ,  H04B10/61 ,  H04J14/06

摘要： A transmitter transmitting a polarization multiplexed optical signal, includes: a light source; a generating unit configured to split a light of the light source into first and second polarized lights, optically modulate the first and second polarized lights based on an electric data signal, and multiplex the first polarized light optically-modulated and the second polarized light optically-modulated to generate the polarization multiplexed optical signal; and a coupling unit configured to couple a first reference light having a frequency different from a frequency of the light of the light source with the first polarized light and couple a second reference light having a frequency different from the frequency of the light of the light source with the second polarized light, wherein the first reference light and the second reference light have different frequencies.

公开(公告)号：EP3435608A1

公开(公告)日：2019-01-30

申请号：EP17845848.5

申请日：2017-06-21

申请人： NTT Electronics Corporation ,  Nippon Telegraph and Telephone Corporation

发明人： ONUMA, Yasuharu ,  YAMAZAKI, Etsushi ,  NOUCHI, Hiroyuki ,  TAKAMUKU, Tomohiro ,  OYAMA, Katsuichi ,  TAKEI, Kazuhito ,  NAKAMURA, Masanori ,  YOSHIDA, Mitsuteru ,  TOMIZAWA, Masahito

IPC分类号： H04L27/01 ,  H04B10/2507 ,  H04B10/60 ,  H04L27/06

摘要： An I component compensation unit (15) 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 (16) 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 (17) calculates the first and second coefficients by comparing outputs of the I component compensation unit (15) and the Q component compensation unit (16) and a known signal.

公开(公告)号：EP3404853A1

公开(公告)日：2018-11-21

申请号：EP17305579.9

申请日：2017-05-18

申请人： Nokia Solutions and Networks Oy

发明人： DUMENIL, Arnaud ,  AWWAD, Elie ,  MEASSON, Cyril

IPC分类号： H04B10/2507

摘要： An optical communications system (100) including a multi-channel optical transmitter (1) comprising a plurality of symbol generators (12), each symbol generator (12) being configured for generating a symbol stream (121), a digital mapping module (13) for performing a mapping on each symbol vector, an emission unit (10) configured for emitting a multi-channel signal (8) carrying the symbol vectors, and a multi-channel optical receiver (3) comprising a reception unit (20) configured for extracting symbol vectors, a digital inverse mapping module (23) for performing the inverse mapping on the received symbol vector, and for reconstructing the data streams from the restored symbol vectors.

公开(公告)号：EP3402083A1

公开(公告)日：2018-11-14

申请号：EP17806246.9

申请日：2017-04-26

申请人： NTT Electronics Corporation

发明人： TAKAMUKU, Tomohiro ,  YAMAZAKI, Etsushi ,  YOSHIDA, Yuki ,  OYAMA, Katsuichi ,  ONUMA, Yasuharu ,  YAMAGISHI, Akihiro

IPC分类号： H04B3/10 ,  H04B10/2507 ,  H04B10/61 ,  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.

公开(公告)号：EP3136622B1

公开(公告)日：2018-08-22

申请号：EP14891841.0

申请日：2014-05-14

申请人： Huawei Technologies Co., Ltd.

发明人： FANG, Yuanyuan ,  SHUAI, Jialong ,  ZHANG, Qiang

IPC分类号： H04B10/2507 ,  H04B10/548 ,  H04B10/50 ,  H04L7/00

CPC分类号： H04L7/0075 ,  H04B10/2507 ,  H04B10/503 ,  H04B10/548 ,  H04B10/572

摘要： According to a transmitter, a receiving device, and a frequency offset correction method that are provided in embodiments of the present invention, after a power parameter of a pilot in an OFDM signal received by a receiving device is detected, a frequency offset value used to indicate a degree and a direction that are of a difference that is between a center frequency of a filter and a center frequency of a laser and that deviates from a first threshold is determined according to the power parameter of the pilot, and then the receiving device corrects the difference between the center frequency of the laser and the center frequency of the filter according to the determined frequency offset value, thereby implementing frequency offset correction of an OFDM system. Because in a frequency offset correction process, frequency offset correction is performed according to the difference between the center frequency of the laser and the center frequency of the filter, which is not only applicable to frequency offset caused by offset of the center frequency of the laser, but also applicable to frequency offset caused by offset of the center frequency of the filter, efficiency of frequency offset correction is improved.

公开(公告)号：EP2777180B1

公开(公告)日：2018-06-20

申请号：EP12798081.1

申请日：2012-11-09

申请人： Aurora Networks, Inc.

发明人： ISHAUG, Brian

IPC分类号： H04L25/03 ,  H04B10/58 ,  H04B10/54 ,  H04B10/2575 ,  H04B10/2507 ,  G02B6/42 ,  H04B10/50

CPC分类号： H04L25/03343 ,  G02B6/423 ,  G02B6/4261 ,  G02B6/4279 ,  G02B6/4284 ,  G02B6/4292 ,  H04B10/2507 ,  H04B10/2575 ,  H04B10/50 ,  H04B10/54 ,  H04B10/58

摘要： A method includes reading operation parameters from a non-volatile memory located in a pluggable module that is coupled to a host module; processing the operational parameters with a processor located in the host module to control operation of a predistortion circuit located in the host module; adding predistortion to a signal with the predistortion circuit located in the host module and then sending the predistorted signal to the pluggable module. An apparatus includes a host module including a predistortion circuit and a processor coupled to the predistortion circuit; and a pluggable module coupled to the host module, wherein the pluggable module includes a non-volatile memory containing operational parameters for the predistortion circuit of the host module, wherein the operational parameters are processed by the processor of the host module to control the predistortion circuit of the host module.

公开(公告)号：EP3107255B1

公开(公告)日：2018-05-02

申请号：EP16175287.8

申请日：2016-06-20

申请人： Ciena Corporation

发明人： O'SULLIVAN, Maurice ,  OVEIS GHARAN, Shahab ,  REIMER, Michael Andrew ,  SHINER, Andrew D.

IPC分类号： H04L27/34 ,  H04B10/516 ,  H04B10/2507 ,  H04B10/532

CPC分类号： H04B10/5561 ,  H04B10/2507 ,  H04B10/516 ,  H04B10/5161 ,  H04B10/532 ,  H04B10/612 ,  H04B10/614 ,  H04B10/69 ,  H04L27/34 ,  H04L27/3405

摘要： Techniques for transmitting a data signal through an optical communications system. An encoder (4) is configured to encode the data signal to generate symbols to be modulated onto an optical carrier. Each symbol encodes multiple bits of data and includes a first portion selected from a first constellation and a second portion selected from a second constellation. The first and second constellations have respective different average amplitudes. Each of the first and second constellations have a cardinality of at least two and the cardinality of the first constellation is greater than the cardinality of the second constellation. A modulator (8) is configured to modulate a first frame of the optical signal using the first portion and modulate a second frame of the optical signal using the second portion. A selection of one frame of the optical signal to be used as the first frame encodes at least 1 bit of data.

公开(公告)号：EP3273622A4

公开(公告)日：2018-04-25

申请号：EP15893955

申请日：2015-11-11

申请人： SANECHIPS TECH CO LTD

发明人： FU HUAJIE ,  GU YANTAO

IPC分类号： H04B10/2507 ,  H04J14/02

CPC分类号： H04B10/2507 ,  G02B6/2861 ,  G02F1/353 ,  H04J14/02

摘要： Disclosed are a strong filter compensation method and device, and a computer storage medium. The method includes filtering out a high-frequency noise by delay summation; determining a correct path from one or more interference item paths; and comprehensively analyzing the determined correct path for every data input during a pre-set period of time, taking the correct path which has the largest number of occurrences as a final correct path, and outputting data in the path.

公开(公告)号：EP2417739B1

公开(公告)日：2018-03-21

申请号：EP09846700.4

申请日：2009-07-03

申请人： Huawei Technologies Co., Ltd.

发明人： HAUSKE, Fabian Nikolaus

IPC分类号： H04B10/61 ,  H04B10/69 ,  H04B10/2507 ,  H04L25/03

CPC分类号： H04L25/03159 ,  H04B10/2507 ,  H04B10/25073 ,  H04B10/6161 ,  H04B10/6162 ,  H04B10/6971

摘要： An adaptive filter configured to filter an input signal comprises Fourier transforming unit configured to transform the input signal into a frequency domain signal upon the basis of the Fourier transform, weighting unit configured to weight at least a portion of the frequency domain signal with a filter coefficient of the dispersion filter in frequency domain to obtain a filtered signal in frequency domain, correlating unit configured to correlate the filtered signal in frequency domain to obtain a correlation value, and adaptation unit configured to adapt the filter coefficient upon the basis of the correlation value.