公开(公告)号：US11888526B2

公开(公告)日：2024-01-30

申请号：US17849278

申请日：2022-06-24

申请人： FUJITSU LIMITED

发明人： Shoichi Murakami ,  Kosuke Komaki ,  Hidetoshi Sato ,  Yuya Osumi ,  Yusuke Shigeta

IPC分类号： H04B10/50 ,  G02F1/21 ,  G02F1/01

CPC分类号： H04B10/50575 ,  G02F1/0123 ,  G02F1/212

摘要： An optical transmitter includes an electro-optic modulator, a monitor circuit that monitors output light of the electro-optic modulator, and a processor that controls a bias voltage of the electro-optic modulator using a monitoring result of the monitor circuit, wherein the processor superimposes a first dither signal with a first frequency and a second dither signal with a second frequency different from the first frequency, onto one bias voltage in a time sharing manner, calculates a first control error based on a first component oscillating at the first frequency and a second control error based on a second component oscillating at the second frequency based on the monitoring result, and determines a control value for controlling the bias voltage using the first control error and the second control error.

公开(公告)号：US20230080354A1

公开(公告)日：2023-03-16

申请号：US17849278

申请日：2022-06-24

申请人： FUJITSU LIMITED

发明人： Shoichi Murakami ,  Kosuke Komaki ,  Hidetoshi Sato ,  YUYA OSUMI ,  Yusuke SHIGETA

IPC分类号： H04B10/50 ,  G02F1/01 ,  G02F1/21

摘要： An optical transmitter includes an electro-optic modulator, a monitor circuit that monitors output light of the electro-optic modulator, and a processor that controls a bias voltage of the electro-optic modulator using a monitoring result of the monitor circuit, wherein the processor superimposes a first dither signal with a first frequency and a second dither signal with a second frequency different from the first frequency, onto one bias voltage in a time sharing manner, calculates a first control error based on a first component oscillating at the first frequency and a second control error based on a second component oscillating at the second frequency based on the monitoring result, and determines a control value for controlling the bias voltage using the first control error and the second control error.

公开(公告)号：US09698905B2

公开(公告)日：2017-07-04

申请号：US14712195

申请日：2015-05-14

申请人： FUJITSU LIMITED

发明人： Taku Saito ,  Kosuke Komaki ,  Taketo Endo

IPC分类号： H04B10/08 ,  H04B10/079 ,  H04B10/077 ,  H04J14/02

CPC分类号： H04B10/07957 ,  H04B10/0779 ,  H04B10/0799 ,  H04B2210/074 ,  H04J14/0256

摘要： An optical transmission system includes comprising: a first optical transmission apparatus to transmit wavelength-multiplexed optical signals; and a second optical transmission apparatus to receive the wavelength-multiplexed optical signals, the second optical transmission apparatus including: a receiver to perform digital coherent reception; a wavelength spacing monitor to transform a reception signal obtained by the digital coherent reception from a time domain signal to a frequency domain spectrum signal, and to monitor wavelength spacing of the spectrum signal; and a transmitter to transmit, to the first optical transmission apparatus, wavelength control information according to a monitor result obtained by the wavelength spacing monitor or the monitor result, wherein the first optical transmission apparatus includes: a receiver to receive the wavelength control information or the monitor result; and a control unit to control the wavelength spacing based on the wavelength control information or the monitor result received by the receiver.

公开(公告)号：US08879145B2

公开(公告)日：2014-11-04

申请号：US14087438

申请日：2013-11-22

申请人： Fujitsu Limited ,  Fujitsu Telecom Networks Limited

发明人： Tomoaki Takeyama ,  Shingo Hara ,  Kosuke Komaki ,  Shota Mori

IPC分类号： H01S3/30

CPC分类号： H01S3/0014 ,  H01S3/06754 ,  H01S3/09415 ,  H01S3/10015 ,  H01S3/10069 ,  H01S3/1301 ,  H01S3/302 ,  H01S2301/02 ,  H04B10/0777 ,  H04B10/2916

摘要： Raman amplifier includes: a pump-light generator configured to supply pump light to a transmission fiber; a measurement circuit configured to measure a relationship between power of the pump light and power of noise output from the transmission fiber with respect to a range from first pump-light power to second pump-light power; a signal detector configured to monitor a supervisory signal in output light of the transmission optical; and a decision unit configured to decide a state of the transmission fiber according to the monitoring result. When the supervisory signal is detected without the pump light, the measurement circuit measures the relationship while increasing the power of the pump light from the first pump-light power. When the supervisory signal is not detected without the pump light, the measurement circuit measures the relationship while decreasing the power of the pump light from the second pump-light power.

摘要翻译： 拉曼放大器包括：泵浦光发生器，被配置为向传输光纤提供泵浦光; 测量电路，被配置为测量泵浦光的功率与从所述传输光纤输出的噪声的功率相对于从第一泵浦光功率到第二泵浦光功率的范围的关系; 信号检测器，被配置为监视所述传输光学的输出光中的监控信号; 以及决定单元，被配置为根据监视结果来决定传输光纤的状态。 当在没有泵浦光的情况下检测到监控信号时，测量电路测量该关系，同时增加来自第一泵浦光功率的泵浦光的功率。 当在没有泵浦光的情况下未检测到监视信号时，测量电路在降低来自第二泵浦光功率的泵浦光的功率的同时测量该关系。

公开(公告)号：US11223385B1

公开(公告)日：2022-01-11

申请号：US17232180

申请日：2021-04-16

申请人： FUJITSU LIMITED

发明人： Shoichi Murakami ,  Taku Saito ,  Kosuke Komaki

IPC分类号： H04B10/08 ,  H04B1/60 ,  H04B10/079

摘要： An optical apparatus includes an attenuator, a photoelectric convertor, an amplifier, and a processor. the attenuator attenuates signal light. The photoelectric convertor converts the signal light attenuated by the attenuator into an electric signal. The amplifier adjusts a gain of the electric signal. The processor detects a monitor value of a target channel from an output signal of the amplifier, calculates a power value of the target channel from the detected monitor value, calculates a difference value between the power value and a target power value, calculates a attenuation amount by adding a current attenuation amount, which is currently set to the attenuator, to the difference value, controls the gain of the amplifier so that the difference value of the target channel is minimized when the set attenuation amount is less than zero, and sets the attenuation amount to the attenuator when the attenuation amount is zero or more.

公开(公告)号：US11196485B2

公开(公告)日：2021-12-07

申请号：US17008689

申请日：2020-09-01

申请人： FUJITSU LIMITED

发明人： Taizo Maeda ,  Kosuke Komaki

IPC分类号： H04B10/61 ,  H04B10/079 ,  H04J14/02 ,  H04B10/516

摘要： A network system includes a first device and a second device coupled to the first device. The second device configured to calculate a bandwidth of an optical signal narrowed by a wavelength filter from the number of wavelength filters on a transmission route of the optical signal, to select, based on a plurality of combinations of a degree of multilevel and the baud rate, and a correspondence between a lower limit value of a bandwidth of the optical signal and a lower limit value of an optical signal to noise ratio (OSNR) for maintaining predetermined quality of the optical signal, one or more first combinations from the plurality of combinations, to select a second combination from the one or more first combinations, and to set the degree of multilevel and the baud rate of the second combination in the first device.

公开(公告)号：US09882647B2

公开(公告)日：2018-01-30

申请号：US15013190

申请日：2016-02-02

申请人： FUJITSU LIMITED

发明人： Taketo Endo ,  Kosuke Komaki ,  Taku Saito ,  Hirofumi Araki ,  Makoto Shimizu ,  Hiroshi Nishida

IPC分类号： H04B10/08 ,  H04B17/00 ,  H04B10/06 ,  H04B10/50 ,  H04B10/079 ,  H04L25/03

CPC分类号： H04B10/50 ,  H04B10/0795 ,  H04B10/612 ,  H04B10/614 ,  H04B10/6162 ,  H04J14/02 ,  H04L25/03343

摘要： An optical transmission apparatus includes: a coherent detector configured to receive light including different polarization components from an optical transmission path, and perform coherent detection of received light including the different polarization components; an adaptive equalizer configured to adaptively equalize, by a digital filter, a complex electric signal for each of the polarization components obtained by the coherent detection, a gain value for controlling an amplitude of the complex electric signal being applied to the complex electric signal; and a polarization dependent loss monitor configured to determine a polarization dependent loss of the optical transmission path, based on a correction filter parameter obtained by correcting a filter parameter of the digital filter according to the gain value, the filter parameter being adaptively updated by an adaptive equalization of the adaptive equalizer.

公开(公告)号：US20170331559A1

公开(公告)日：2017-11-16

申请号：US15592601

申请日：2017-05-11

申请人： FUJITSU LIMITED

发明人： Shuzo Matsushita ,  Taku Saito ,  Kosuke Komaki ,  Masamichi Sugamoto ,  Hironobu Hongou

IPC分类号： H04B10/564 ,  H04B10/079 ,  H04B10/516 ,  H04B10/548

CPC分类号： H04B10/564 ,  G02F1/2255 ,  H04B10/07955 ,  H04B10/5053 ,  H04B10/50577 ,  H04B10/5162 ,  H04B10/548

摘要： There is provided an optical transmitter including a memory, a processor coupled to the memory and the processor to generate an electric signal, an optical generator to generate light, an optical modulator to modulate the light with the electric signal to create an optical signal, a first voltage electrode to apply a first voltage to the optical signal, a second voltage electrode to apply a second voltage to the optical signal to which the first voltage is applied, and a detector to detect an optical power of the optical signal to which the second voltage is applied, wherein the processor stops generating the electric signal, controls the first voltage electrode to change the first voltage after the stop of generating the electric signal, and controls the second voltage electrode to change the second voltage according to the detected optical power after the change of the first voltage.

公开(公告)号：US09438343B2

公开(公告)日：2016-09-06

申请号：US13954024

申请日：2013-07-30

申请人： FUJITSU LIMITED

发明人： Norifumi Shukunami ,  Kosuke Komaki

IPC分类号： H04B10/08 ,  H04B17/00 ,  H04J14/06 ,  H04B10/12 ,  H01S3/00 ,  H04B10/25 ,  H04B10/077 ,  H04B10/079 ,  H04B10/564 ,  H04J14/02 ,  H04B10/112

CPC分类号： H04B10/2504 ,  H04B10/0775 ,  H04B10/07955 ,  H04B10/1121 ,  H04B10/564 ,  H04J14/0221 ,  H04J14/0275

摘要： A transmitting device includes a transmitter configured to transmit signal light to an external receiver over a medium included in a transmission line; and a controller configured to control a transmission level of the signal light in accordance with a reception level of probe light which is input from the receiver over the medium in the transmission line.

摘要翻译： 一种发送设备，包括发射机，被配置为通过传输线中包含的介质向外部接收机发射信号光; 以及控制器，被配置为根据在传输线中的介质上从接收器输入的探测光的接收电平来控制信号光的发射电平。

公开(公告)号：US20150132009A1

公开(公告)日：2015-05-14

申请号：US14531341

申请日：2014-11-03

申请人： FUJITSU LIMITED

发明人： Masahiro Yuki ,  Norifumi Shukunami ,  Kosuke Komaki

IPC分类号： H04B10/572 ,  H04B10/40

CPC分类号： H04J14/0221 ,  H04B10/0797 ,  H04B10/296 ,  H04J14/0212

摘要： An optical transmission device includes a receiver that receives first light, a transmitter that outputs second light, a memory, a processor coupled to the memory, configured to control a first optical level of the second light in such a way that a second optical level calculated based on an optical level of the received first light and an optical level of the second light that is output from the transmitter becomes a predetermined target value, a combiner that combines the received first light and the second light for which the first optical level is controlled by the processor, and an amplifier that amplifies the combined light.

摘要翻译： 光传输装置包括接收第一光的接收器，输出第二光的发射器，存储器，耦合到存储器的处理器，被配置为以这样一种方式控制第二光的第一光学电平， 基于接收到的第一光的光学水平和从发射机输出的第二光的光学水平成为预定目标值，组合接收的第一光和控制第一光学电平的第二光的组合器 由处理器和放大组合光的放大器。