公开(公告)号：US11558121B2

公开(公告)日：2023-01-17

申请号：US17364929

申请日：2021-07-01

申请人： FUJITSU LIMITED

发明人： Setsuo Yoshida ,  Shoichiro Oda ,  Kazuyuki Tajima ,  Takeshi Hoshida ,  Takahito Tanimura

IPC分类号： H04B10/04 ,  H04B10/564 ,  H04B10/61 ,  G02F1/01 ,  G02F1/21 ,  H04B10/079

摘要： An optical transmitter includes: a modulator, square law detector, and a processor. The modulator generates an optical signal indicating transmission data. The square law detector detects an intensity of the optical signal using a photodetector and output first intensity data indicating the detected intensity. The processor calculates, based on the transmission data, an electric field of the optical signal generated by the modulator by using parameters pertaining to a state of the modulator. The processor calculates second intensity data indicating the intensity of the optical signal based on the calculated electric field. The processor updates the parameters so as to reduce a difference between the first intensity data and the second intensity data. The processor controls the state of the modulator based on the parameters.

公开(公告)号：US20220224417A1

公开(公告)日：2022-07-14

申请号：US17515584

申请日：2021-11-01

申请人： FUJITSU LIMITED

发明人： Shoichiro Oda ,  Daijiro Tanaka ,  Kenji Ota ,  Takafumi Kusumi ,  Daiki Matsuyama

IPC分类号： H04B10/572 ,  H04B10/294

摘要： A transmission device includes: a memory; and a processor coupled to the memory and configured to: transmit or receive an optical signal; filter an electrical electric field signal that indicates electric field information of the optical signal; calculate a transmission characteristic of filtering of the electric field signal and set the transmission characteristic in the filter on a basis of a narrowing amount of a wavelength band of the optical signal transmitted through a transmission line and a narrowing amount of the wavelength band when a state of the transmission line is changed on a basis of transmission line information regarding the transmission line of the optical signal; and set a transmission parameter of the optical signal according to quality of the electric field signal filtered by the filter.

公开(公告)号：US11057144B2

公开(公告)日：2021-07-06

申请号：US16677291

申请日：2019-11-07

申请人： FUJITSU LIMITED

发明人： Masatake Miyabe ,  Shoichiro Oda

IPC分类号： H04J14/02 ,  H04B10/071 ,  H04B10/572

摘要： An optical transmission apparatus includes the optical transceiver configured to generate a test light for each wavelength assignable to the wavelength multiplex light to transmit the test light to the optical transmission line via the wavelength multiplexer and demultiplexer, detect a reflected light for the test light from the optical transmission line, calculate an arrival distance of the test light for the each wavelength from the reflected light for the each wavelength, and set a wavelength having a longest arrival distance among the arrival distances for the respective wavelengths, as a wavelength to be assigned to the signal light in the optical transceiver.

公开(公告)号：US10374703B2

公开(公告)日：2019-08-06

申请号：US16110451

申请日：2018-08-23

申请人： FUJITSU LIMITED

发明人： Shoichiro Oda ,  Takeshi Hoshida ,  Hisao Nakashima ,  Yi Ge

IPC分类号： H04B10/079 ,  H04B10/67 ,  H04J14/02 ,  H04Q11/00 ,  H04L1/20

摘要： A transmission device includes: a receiving unit that receives an optical signal; an acquiring unit that acquires spectrum information from the optical signal, the spectrum information relating to a spectrum of the optical signal; and a narrowing calculating unit that calculates an index value for narrowing of a band of the optical signal by calculating a sampling timing error in accordance with the spectrum information, the sampling timing error being an error when a clock signal is extracted from the optical signal.

公开(公告)号：US10230463B2

公开(公告)日：2019-03-12

申请号：US15227580

申请日：2016-08-03

申请人： FUJITSU LIMITED

发明人： Guoxiu Huang ,  Yasuhiko Aoki ,  Shoichiro Oda ,  Zhenning Tao ,  Setsuo Yoshida ,  Kyosuke Sone

IPC分类号： H04B10/079 ,  H04B10/548 ,  H04B10/077

摘要： A transmitter generates a frequency-modulated CW light so as to transmit it to a path. A receiver receives the CW light that has passed through passband filters included in the path. The receiver includes a processor. The processor measures an optical power of the received CW light every time a center frequency of the CW light is changed and transmitted by the transmitter. The processor calculates transmission characteristics of the CW light that has passed through the passband filters, on the basis of an average value of the optical power that corresponds to a center frequency of the CW light and on the basis of an amplitude component that indicates an amount of change in the optical power, the average value and the amplitude component being obtained as a result of the measurement.

公开(公告)号：US10177843B2

公开(公告)日：2019-01-08

申请号：US15470409

申请日：2017-03-27

申请人： FUJITSU LIMITED

发明人： Tomohiro Yamauchi ,  Shoichiro Oda

IPC分类号： H04B10/08 ,  H04B10/079 ,  H04J14/02 ,  H04L1/24

摘要： A network control apparatus includes a processor. The processor calculates a first OSNR corresponding to an allowable limit BER from an OSNR yield strength curve of a transmission end in a node of a transmission end. The processor acquires a reception BER of a second node of a reception end, and calculates a second OSNR corresponding to the reception BER from the OSNR yield strength curve of the transmission end. The processor calculates a first noise intensity corresponding to the allowable limit BER from the first OSNR. The processor calculates a second noise intensity corresponding to the reception BER from the second OSNR. The processor calculates a noise intensity margin, based on the first noise intensity and the second noise intensity.

公开(公告)号：US09906296B2

公开(公告)日：2018-02-27

申请号：US15172312

申请日：2016-06-03

申请人： FUJITSU LIMITED

发明人： Shoichiro Oda ,  Yasuhiko Aoki ,  Takeshi Hoshida ,  Hisao Nakashima ,  Hiroki Oi

IPC分类号： H04B10/079 ,  H04B10/00 ,  H04J14/02

CPC分类号： H04B10/07953 ,  H04B10/0793 ,  H04J14/0256

摘要： A network controller includes: a first acquisition unit configured to acquire, based on a signal quality amount of each of wavelength paths set in a network of an optical wavelength-multiplexed transmission system, a signal quality amount of each of spans in each of the wavelength paths; an arithmetic unit configured to calculate a signal quality amount of each of spans in a wavelength path of an estimation target, based on the signal quality amount acquired by the first acquisition unit; and an estimation unit configured to estimate a signal quality amount of the wavelength path of the estimation target, based on the signal quality amount calculated by the arithmetic unit.

公开(公告)号：US09887774B2

公开(公告)日：2018-02-06

申请号：US15457150

申请日：2017-03-13

申请人： FUJITSU LIMITED

发明人： Guoxiu Huang ,  Yasuhiko Aoki ,  Shoichiro Oda ,  Setsuo Yoshida

IPC分类号： H04B10/07 ,  H04B10/079 ,  H04B10/548 ,  H04J14/02

CPC分类号： H04B10/07955 ,  H04B10/548 ,  H04J14/0212

摘要： A transmission characteristics monitoring device monitors transmission characteristics of an optical transmission path between nodes. The device detects an average power of the frequency modulated optical signal and a slope of the transmission characteristics; generates a slope function that represents a slope of the transmission characteristics between first and second frequencies; generates a corrected power value by adding an integral of the slope function to a first power measurement value detected at the first frequency; calculates the transmission characteristics at the second frequency based on a second power measurement value detected at the second frequency when the difference between the second power measurement value and the corrected power value is smaller than a specified threshold; and calculates the transmission characteristics at the second frequency based on the corrected power value when the difference is greater than the specified threshold.

公开(公告)号：US20170230112A1

公开(公告)日：2017-08-10

申请号：US15418335

申请日：2017-01-27

申请人： FUJITSU LIMITED

发明人： Shoichiro Oda ,  Setsuo Yoshida ,  KEISUKE HARADA

IPC分类号： H04B10/079

CPC分类号： H04B10/07953 ,  H04B10/0791

摘要： An optical signal-to-noise ratio (OSNR) measuring device includes a processor, wherein the processor executes a process. The process includes: converting an optical signal to an electrical signal; first acquiring a signal intensity from the electrical signal; second acquiring a noise intensity of a predetermined frequency band from the electrical signal; performing a digital conversion on the noise intensity; and computing an OSNR of the optical signal based on the signal intensity and the converted noise intensity. The predetermined frequency band is a frequency band including a folding noise that occurs when the digital conversion is performed.

公开(公告)号：US20170149497A1

公开(公告)日：2017-05-25

申请号：US15350596

申请日：2016-11-14

申请人： FUJITSU LIMITED

发明人： Tomohiro YAMAUCHI ,  Shoichiro Oda ,  GOJI NAKAGAWA

IPC分类号： H04B10/079 ,  H04B10/50 ,  H04B10/60 ,  H04J14/02

CPC分类号： H04B10/0795 ,  H04B10/07953 ,  H04B10/07955 ,  H04B10/50 ,  H04B10/60 ,  H04J14/02 ,  H04J14/0201

摘要： An optical transmission apparatus includes a first optical transmission line through which the signal of the first channel pass, the signal having a signal quality at a first strength and; an optical receiver configured to receive, from a network control apparatus, information about a second strength based on a signal quality of a signal of a second channel passing through a second optical transmission line of which at least a portion is a same as that of the signal of the first channel; and an optical transmitter configured to transmit the signal of the first channel at the second strength.