公开(公告)号：US10200132B2

公开(公告)日：2019-02-05

申请号：US15445169

申请日：2017-02-28

申请人： FUJITSU LIMITED

发明人： Kyosuke Sone ,  Yasuhiko Aoki ,  Goji Nakagawa

IPC分类号： H04B10/572 ,  H04B10/2575 ,  H04Q11/00

摘要： An optical communication system includes an optical transmitter, a plurality of optical receivers, and a splitter that splits light transmitted by the optical transmitter to the plurality of optical receivers. The optical transmitter includes a variable-wavelength light source capable of transmitting light of a first wavelength and light of a third wavelength between the first wavelength and a second wavelength. A first optical receiver of the plurality of optical receivers includes a first optical filter having a first transmission band including the first and third wavelengths, and a first receiving unit that receives light having passed through the first optical filter. A second optical receiver of the plurality of optical receivers includes a second optical filter having a second transmission band including the second and third wavelengths, and a second receiving unit that receives light having passed through the second optical filter.

公开(公告)号：US10158422B2

公开(公告)日：2018-12-18

申请号：US15489836

申请日：2017-04-18

申请人： FUJITSU LIMITED

发明人： Shoichiro Oda ,  Masatake Miyabe ,  Setsuo Yoshida ,  Yasuhiko Aoki ,  Toru Katagiri ,  Goji Nakagawa ,  Shigeru Ishii ,  Yutaka Takita

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

摘要： There is provided an apparatus configured to estimate optical transmission performance in a transmission path of an optical signal, the apparatus including a memory, and a processor coupled to the memory and the processor configured to acquire a first index related to a first transmission performance of an optical signal transmitted through a span group between a first node and an n-th node and a second index related to a second transmission performance of an optical signal transmitted through a span or a span group between the first node and an m-th node, wherein n is an integer of 3 or more, and m is the integer satisfying m

公开(公告)号：US11968033B2

公开(公告)日：2024-04-23

申请号：US17875766

申请日：2022-07-28

申请人： FUJITSU LIMITED

发明人： Tomohiro Yamauchi ,  Takafumi Terahara ,  Goji Nakagawa

IPC分类号： H04B10/079 ,  H04J14/02

CPC分类号： H04J14/0221 ,  H04B10/07953 ,  H04B10/07955 ,  H04B10/0799

摘要： Optical transmission system transmits WDM signal from first node to second node via optical fiber. The optical transmission system includes: first OCM that detects optical power of each wavelength channel of the WDM signal in the first node; second OCM that detects optical power of each wavelength channel of the WDM signal in the second node; first processor that calculates linear SNR of each wavelength channel based on the optical power of each wavelength channel detected by the second OCM; second processor that calculates non-linear SNR of each wavelength channel based on the optical power of each wavelength channel detected by the first OCM; third processor that calculates GSNR for each wavelength channel using the linear SNR and the non-linear SNR; and fourth processor that controls transmission power of each wavelength channel of the WDM signal based on the GSNR of each wavelength channel.

公开(公告)号：US11387912B2

公开(公告)日：2022-07-12

申请号：US16952776

申请日：2020-11-19

申请人： FUJITSU LIMITED

发明人： Goji Nakagawa ,  Tomoyuki Kato

IPC分类号： H04B10/67 ,  H04J14/02 ,  G02F2/00 ,  G02F1/35 ,  H04J14/06 ,  G02B27/10

摘要： A wavelength converter that converts signal light and pump light into a light containing a new wavelength component using a nonlinear optical fiber, has a PBS for splitting incident light into a first polarized wave and a second polarized wave, a first polarization controller provided between the PBS and a first end of the nonlinear optical fiber, and a second polarization controller provided between the PBS and a second end of the nonlinear optical fiber, wherein in an optical loop connecting the PBS, the first polarization controller, the nonlinear optical fiber and the second polarization controller, the first polarized wave and a first component of the pump light travel through the nonlinear optical fiber in a first direction, and the second polarized wave and a second component of the pump light travel through the nonlinear optical fiber in a second direction opposite to the first direction.

公开(公告)号：US10567082B2

公开(公告)日：2020-02-18

申请号：US15975101

申请日：2018-05-09

申请人： FUJITSU LIMITED

发明人： Kyosuke Sone ,  Goji Nakagawa ,  Yoshio Hirose

IPC分类号： H04B10/2575 ,  H04W52/02

摘要： An optical terminal device includes: a relay processing circuitry relaying communication between first base stations, respectively connected to optical terminating devices at branch destinations of a transmission path, and a control device controlling the first base stations in accordance with information acquired from a second base station covering a cell overlapping cells of the first base stations; a detecting circuitry detecting a sleep control instruction, issued for one of the first base stations from the control device, from the communication being relayed by the relay processing circuitry; and a control circuitry performing control, via the transmission path, to cause the optical terminating device connected to the one of the first base stations to shift to an operating state or a sleep state, which consumes less power than the operating state, in response to detection of the sleep control instruction, the optical terminating device being one of the optical terminating devices.

公开(公告)号：US09496953B2

公开(公告)日：2016-11-15

申请号：US14537396

申请日：2014-11-10

申请人： FUJITSU LIMITED

发明人： Goji Nakagawa ,  Yasuhiko Aoki

IPC分类号： H04B10/079 ,  H04B10/077

CPC分类号： H04B10/0795 ,  H04B10/0775 ,  H04B2210/074

摘要： A device for monitoring optical signal includes: an optical filter configured to allow part of a spectrum of an optical signal on which a frequency or phase modulated signal is superimposed to pass; and a detection unit configured to detect signal quality of the optical signal, based on a power ratio of a signal component to a noise component of the modulated signal, the power ratio being obtained based on a power change in accordance with the modulated signal of light that has been caused to pass through the optical filter.

摘要翻译： 一种用于监视光信号的装置包括：滤光器，被配置为允许其上叠加有频率或相位调制信号的光信号的频谱的一部分通过; 以及检测单元，被配置为基于信号分量与调制信号的噪声分量的功率比来检测光信号的信号质量，功率比是基于根据光的调制信号的功率变化获得的 已经导致通过滤光器。

公开(公告)号：US09444573B2

公开(公告)日：2016-09-13

申请号：US14658750

申请日：2015-03-16

申请人： FUJITSU LIMITED

发明人： Goji Nakagawa ,  Shoichiro Oda

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

CPC分类号： H04J14/0221 ,  H04B10/675 ,  H04J14/0212 ,  H04J14/0258 ,  H04Q11/0066 ,  H04Q2011/0009 ,  H04Q2011/0016 ,  H04Q2011/0083

摘要： A transmission device that receives an optical signal on which a frequency modulated signal is superimposed includes: an optical filter configured to filter the optical signal; a filter controller configured to control a passband of the optical filter based on a change of power of the optical signal; and a signal detection unit configured to detect the frequency modulated signal based on the change of the power of the optical signal filtered by the optical filter.

摘要翻译： 接收其上叠加有调制信号的光信号的发送装置包括：滤波器，被配置为对所述光信号进行滤波; 滤波器控制器，被配置为基于所述光信号的功率的变化来控制所述滤光器的通带; 以及信号检测单元，被配置为基于由所述滤光器滤波的光信号的功率的变化来检测所述调频信号。

公开(公告)号：US11876559B2

公开(公告)日：2024-01-16

申请号：US17876782

申请日：2022-07-29

申请人： FUJITSU LIMITED

发明人： Goji Nakagawa ,  Takafumi Terahara ,  Hiroki Oi

IPC分类号： H04B10/08 ,  H04B10/2525 ,  H04B10/079

CPC分类号： H04B10/2525 ,  H04B10/07955

摘要： An optical transmission system includes a first optical node, a second optical node, and an optical fiber provided between the first optical node and the second optical node. The optical transmission system further includes: a signal generator provided in the first optical node and configured to generate an optical signal including a plurality of wavelength channels and an empty channel; an optical transmission circuit provided in the first optical node and configured to output the optical signal to the optical fiber; an optical channel monitor provided in the second optical node and configured to measure reception power of each channel in the optical signal received through the optical fiber; and a processor configured to determine a type of the optical fiber based on the reception power of the empty channel, the reception power being measured by the optical channel monitor.

公开(公告)号：US09838148B2

公开(公告)日：2017-12-05

申请号：US15095698

申请日：2016-04-11

申请人： FUJITSU LIMITED

发明人： Goji Nakagawa ,  Tomohiro Yamauchi ,  Guoxiu Huang ,  Setsuo Yoshida ,  Shoichiro Oda ,  Kyosuke Sone ,  Yasuhiko Aoki

IPC分类号： H04J14/02 ,  H04B10/077 ,  H04B10/25

CPC分类号： H04J14/0221 ,  H04B10/077 ,  H04B10/25 ,  H04J14/0278

摘要： An optical receiver includes: a tunable filter configured to partially transmit a wavelength-multiplexed optical-signal including a first optical-signal having a first wavelength, a second optical-signal having a second wavelength, and a third optical-signal having a third wavelength, with a frequency-modulated signal superimposed on each of the first to third optical-signals; a photo detector configured to detect an optical-power of the wavelength-multiplexed optical-signal transmitted through the tunable filter; and a superimposed signal detector configured to detect the frequency-modulated signal superimposed on the first optical-signal, based on an amplitude-modulated signal according to a variation in the optical-power on a first filter setting where both of the first optical-signal and the second optical-signal transmit through the tunable filter, and an amplitude-modulated signal according to a variation in the optical-power on a second filter setting where both of the first optical-signal and the third optical-signal transmit through the tunable filter.

公开(公告)号：US09705604B2

公开(公告)日：2017-07-11

申请号：US15080939

申请日：2016-03-25

申请人： FUJITSU LIMITED

发明人： Kyosuke Sone ,  Setsuo Yoshida ,  Goji Nakagawa ,  Shoichiro Oda ,  Yasuhiko Aoki

IPC分类号： H04B10/079 ,  H04B10/572 ,  H04J14/02

CPC分类号： H04B10/572 ,  H04B10/07955 ,  H04J14/02

摘要： A communication device that receives received signal light from another communication device, the communication device includes: a receiver configured to receive signal light output from an optical filter that outputs signal light of a given wavelength included the received signal light; and a transmitter configured to transmit, to the another communication device, a control signal for controlling a wavelength of laser light for use in generation of the signal light of the given wavelength, wherein the receiver is configured to detect power of the signal light output from the optical filter; and the transmitter is configured to set, when the signal light is not successfully received in the receiver, the control signal so as to cause the another communication device to control the wavelength of the laser light, based on the power.