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1. 发明申请

US20180367220A1 OPTICAL TRANSMITTER AND SKEW COMPENSATION METHOD 审中-公开
公开(公告)号：US20180367220A1
公开(公告)日：2018-12-20
申请号：US16005748
申请日：2018-06-12
申请人： FUJITSU LIMITED
发明人： Yoshitaka Nomura , Tomofumi Oyama , Hisao Nakashima , YUICHI AKIYAMA , Takeshi Hoshida
IPC分类号： H04B10/58 , H04B10/079
摘要： There is provided an optical transmitter including a modulator, a signal generator configured to generate in-phase or anti-phase skew adjustment signals that are identical in amplitude and frequency as signals to be input into an I axis and a Q axis of the modulator, a skew adjuster configured to perform skew adjustment upon the skew adjustment signals, a light source configured to enter light into the modulator, a monitor configured to monitor light that has been modulated using the skew adjustment signals and output from the modulator, a power detector configured to detect power of monitor light, and a controller configured to determine a skew adjustment amount with which average power of the monitor light is at a maximum or minimum value as an optimum skew adjustment value while changing a skew adjustment amount of the skew adjuster.

2. 发明申请

US20160065312A1 OPTICAL TRANSMISSION DEVICE, NONLINEAR DISTORTION COMPENSATION METHOD, AND NONLINEAR DISTORTION PRE-EQUALIZATION METHOD 有权
标题翻译：光学传输装置，非线性失真补偿方法和非线性失真预均衡方法
公开(公告)号：US20160065312A1
公开(公告)日：2016-03-03
申请号：US14828605
申请日：2015-08-18
申请人： FUJITSU LIMITED
发明人： Tomofumi Oyama , Takahito Tanimura , Takeshi Hoshida , Hisao Nakashima , YUICHI AKIYAMA
IPC分类号： H04B10/58 , H04L25/03
CPC分类号： H04B10/58 , H04B10/25073 , H04B10/2543 , H04B10/616 , H04B10/6163 , H04B10/6971 , H04B2210/252 , H04B2210/254 , H04L25/03343
摘要： An optical receiver includes a dividing unit, a control unit, and a compensating unit. The dividing unit divides an optical transmission signal into a plurality of frequency components by a set number of divisions and a set division bandwidth. The control unit controls the number of divisions and the division bandwidth on the basis of transmission path information about an optical transmission line through which the optical transmission signal is transmitted and signal information about the optical transmission signal. The compensating unit compensates optical nonlinear distortion of each of the frequency components divided by the dividing unit.
摘要翻译：光接收机包括分割单元，控制单元和补偿单元。分割单元将光传输信号划分成多个频率分量，设定分割数和设定的分频带宽。控制单元根据关于发送光传输信号的光传输线的传输路径信息和关于光传输信号的信号信息来控制划分数和分区带宽。补偿单元补偿由分割单元划分的每个频率分量的光学非线性失真。

3. 发明申请

US20210103200A1 WAVELENGTH CONVERTER, OPTICAL COMMUNICATION SYSTEM, AND METHOD FOR ADJUSTING WAVELENGTH CONVERTER 有权
公开(公告)号：US20210103200A1
公开(公告)日：2021-04-08
申请号：US17036850
申请日：2020-09-29
申请人： FUJITSU LIMITED
发明人： GOJI NAKAGAWA , Tomoyuki Kato , Tomohiro YAMAUCHI , YUICHI AKIYAMA
IPC分类号： G02F2/00
摘要： A wavelength converter includes an input port, an optical fiber configured to cause a signal light and an excitation light to interact with each other due to a nonlinear optical effect, the signal light and the excitation light being input to the input port, a stress application mechanism configured to apply stress in a direction crossing a winding direction of the optical fiber, and an output port configured to output a converted light having a wavelength different from wavelengths of the signal light and the excitation light.

4. 发明申请

US20170163347A1 OPTICAL TRANSMITTER AND CONTROL METHOD OF OPTICAL TRANSMITTER 审中-公开
公开(公告)号：US20170163347A1
公开(公告)日：2017-06-08
申请号：US15365892
申请日：2016-11-30
申请人： FUJITSU LIMITED
发明人： YUICHI AKIYAMA , Hisao Nakashima
IPC分类号： H04B10/548 , H04B10/564 , H04B10/079
CPC分类号： H04B10/548 , H04B10/0795 , H04B10/564
摘要： A signal shifted from a carrier frequency in a frequency domain by using digital signal processing is generated, and the optical modulator is driven with a drive signal based on the signal. A monitor monitors whether or not a component of a modulated signal light output from the optical modulator appears in a specific frequency depending on a frequency shift performed by the digital signal processing, and the controller controls a relation between a sign of the drive signal and an operating point of the optical modulator according to a monitored result.

5. 发明申请

US20160020853A1 OPTICAL TRANSMISSION APPARATUS AND DETECTION APPARATUS 有权
标题翻译：光传输装置和检测装置
公开(公告)号：US20160020853A1
公开(公告)日：2016-01-21
申请号：US14794873
申请日：2015-07-09
申请人： FUJITSU LIMITED
发明人： YUICHI AKIYAMA
IPC分类号： H04B10/079 , H04B10/564
CPC分类号： H04B10/07955 , H04B10/5057 , H04B10/564 , H04B10/58
摘要： An optical transmission apparatus includes an optical modulator that is driven by a drive signal generated from an electrical signal obtained by performing a digital signal processing on a data signal, a detector configured to detect a change in a spectrum of output light of the optical modulator, and a controller configured to control the digital signal processing based on a detection result of the detector.
摘要翻译：光传输装置包括光调制器，该光调制器由通过对数据信号执行数字信号处理获得的电信号产生的驱动信号驱动，检测器，被配置为检测光调制器的输出光的频谱变化，以及控制器，被配置为基于检测器的检测结果来控制数字信号处理。

6. 发明申请

US20180248643A1 RECEPTION DEVICE AND METHOD OF DETECTING SUPERVISORY CONTROL SIGNAL 审中-公开
公开(公告)号：US20180248643A1
公开(公告)日：2018-08-30
申请号：US15900128
申请日：2018-02-20
申请人： FUJITSU LIMITED
发明人： Yi Ge , Takeshi Hoshida , Hisao Nakashima , Tomofumi Oyama , YUICHI AKIYAMA
IPC分类号： H04J14/02 , H04B10/66 , H04B10/556
CPC分类号： H04J14/0227 , H04B10/548 , H04B10/556 , H04B10/612 , H04B10/66 , H04J14/0212 , H04J14/0275
摘要： There is provided a reception device including a receiver configured to receive a wavelength-multiplexed optical signal so as to generate a wavelength-multiplexed signal, a filter configured to pass through the wavelength-multiplexed signal having a specific wavelength and an adjacent wavelength to the specific wavelength from the wavelength-multiplexed signal, and a processor configured to detect a specific signal having the specific wavelength from the wavelength-multiplexed signal having the passed through wavelengths by the filter, and detect a first supervisory control signal having the specific wavelength and a second supervisory control signal having the adjacent wavelength from the wavelength-multiplexed signal having the passed through wavelengths by the filter.

7. 发明申请

US20170310394A1 DIGITAL SIGNAL PROCESSING CIRCUIT AND SIGNAL PROCESSING DEVICE THAT INCLUDES A PLURALITY OF DIGITAL SIGNAL PROCESSING CIRCUITS 审中-公开
公开(公告)号：US20170310394A1
公开(公告)日：2017-10-26
申请号：US15490085
申请日：2017-04-18
申请人： FUJITSU LIMITED
发明人： Hisao Nakashima , Yoshitaka Nomura , Tomofumi Oyama , Yi Ge , YUICHI AKIYAMA , Yoshio Hirose , Takeshi Hoshida
IPC分类号： H04B10/2513 , H04L1/00
CPC分类号： H04B10/2513 , H04B10/616 , H04L1/0042 , H04L1/0057
摘要： A signal processing device includes digital signal processing circuits. Each of the digital signal processing circuits includes: a regeneration circuit that regenerates a bit stream front an electric field information signal of an optical signal; an error correction circuit that corrects an error in the bit stream; an encoder circuit that generates an encoded bit stream from received data; and a generation circuit that generates an electric field information signal from the encoded bit stream. An electric field information signal or a bit stream is given from a regeneration circuit, an encoder circuit or a generation circuit in a first digital signal processing circuit to a second digital signal processing circuit. A regeneration circuit, an error correction circuit or a generation circuit in the second digital signal processing circuit processes the electric field information signal or the bit stream given from the first digital signal processing circuit.

8. 发明申请

US20140334829A1 OPTICAL TRANSMITTER AND BIAS CONTROL METHOD OF OPTICAL MODULATOR 有权
标题翻译：光学调制器的光学发射器和偏置控制方法
公开(公告)号：US20140334829A1
公开(公告)日：2014-11-13
申请号：US14338763
申请日：2014-07-23
申请人： FUJITSU LIMITED
发明人： YUICHI AKIYAMA
IPC分类号： H04B10/54
CPC分类号： H04B10/54 , G02F1/0123 , H04B10/5053 , H04B10/50575
摘要： An optical transmitter includes: a drive signal generator configured to generate a drive signal from input data; an optical modulator configured to generate an optical signal corresponding to the drive signal; a superimposer configured to superimpose a first reference signal on the drive signal and superimpose a second reference signal on a bias voltage of the optical modulator; a detector configured to detect the first reference signal and the second reference signal included in the optical signal, and generate a first monitor signal indicating intensity and a phase of the detected first reference signal and a second monitor signal indicating intensity and a phase of the detected second reference signal; and a controller configured to control the bias voltage of the optical modulator in a control scheme determined based on the first monitor signal and the second monitor signal.
摘要翻译：光发射机包括：驱动信号发生器，被配置为从输入数据产生驱动信号; 光调制器，被配置为产生对应于所述驱动信号的光信号; 配置为将第一参考信号叠加在驱动信号上并将第二参考信号叠加在光调制器的偏置电压上的叠加器; 检测器，被配置为检测包括在光信号中的第一参考信号和第二参考信号，并且产生指示检测到的第一参考信号的强度和相位的第一监视信号，以及指示检测到的第一参考信号的强度和相位的第二监视信号第二参考信号; 以及控制器，被配置为以基于第一监视信号和第二监视信号确定的控制方案来控制光调制器的偏置电压。

9. 发明申请

US20190020531A1 TRANSMISSION SYSTEM AND METHOD 审中-公开
公开(公告)号：US20190020531A1
公开(公告)日：2019-01-17
申请号：US16029274
申请日：2018-07-06
申请人： FUJITSU LIMITED
发明人： Yi Ge , Takeshi Hoshida , Hisao Nakashima , YUICHI AKIYAMA
IPC分类号： H04L27/36 , H03C3/40 , H04L1/00 , H04L25/49 , H03F1/00
CPC分类号： H04L27/364 , H03C3/40 , H03C5/00 , H03F1/00 , H03F3/24 , H03F2200/336 , H04B1/0475 , H04L1/0042 , H04L1/0047 , H04L25/03828 , H04L25/49
摘要： A transmission system includes a first transponder including a first I/Q modulator, and a second transponder including a second I/Q modulator, and configured to communicate with the first transponder using a frequency modulation scheme, wherein the first transponder is configured to set a first phase rotation mode in a first state for first light signal output from the first I/Q modulator, and transmit, to the second transponder, a first command to specify a second phase rotation mode for second light signal output from the second I/Q modulator, and the second transponder is configured to set, in response to the first command, the second phase rotation mode in a state specified by the first command.

10. 发明申请

US20180175933A1 COMMUNICATION DEVICE, COMMUNICATION SYSTEM AND COMMUNICATION METHOD FOR TRANSMITTING OPTICAL SIGNAL 审中-公开
公开(公告)号：US20180175933A1
公开(公告)日：2018-06-21
申请号：US15842218
申请日：2017-12-14
申请人： FUJITSU LIMITED
发明人： Yoshitaka Nomura , Hisao Nakashima , Tomofumi Oyama , YUICHI AKIYAMA , Takeshi Hoshida
IPC分类号： H04B10/079 , H04B10/50
CPC分类号： H04B10/079 , H04B10/50
摘要： A communication device includes: a spectrum controller and optical signal generator. The spectrum controller controls a shape of a spectrum of a first signal. The optical signal generator generates an optical signal based on the first signal, the shape of the spectrum of the first signal being controlled by the spectrum controller. The spectrum controller controls the shape of the spectrum of the first signal according to a second signal.

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