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11. 发明授权

US10873410B2 Reception device and method of detecting supervisory control signal 有权
公开(公告)号：US10873410B2
公开(公告)日：2020-12-22
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： H04B10/079 , H04B10/077 , H04B10/572 , H04J14/02 , H04B10/556 , H04B10/66 , H04B10/61 , H04B10/548
CPC分类号： H04J14/0227 , H04B10/0775 , H04B10/07957 , H04B10/548 , H04B10/556 , H04B10/572 , 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.

12. 发明授权

US10498459B2 Optical transmitter and skew compensation method 有权
公开(公告)号：US10498459B2
公开(公告)日：2019-12-03
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 , H04B10/50
CPC分类号： H04B10/58 , H04B10/0795 , H04B10/0799 , H04B10/5057
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.

13. 发明授权

US09859985B2 Optical transmitter, optical transmission system and optical communication control method 有权
公开(公告)号：US09859985B2
公开(公告)日：2018-01-02
申请号：US15062816
申请日：2016-03-07
申请人： FUJITSU LIMITED
发明人： Yuichi Akiyama
IPC分类号： H04B10/04 , H04B10/12 , H04B10/556 , H04B10/516 , H04B10/532 , H04B10/50 , H04B10/00
CPC分类号： H04B10/5561 , H04B10/00 , H04B10/505 , H04B10/5055 , H04B10/50577 , H04B10/5161 , H04B10/532
摘要： An optical transmitter has an electrical signal generator configured to generate an electrical drive signal based upon input data; an optical modulator configured to modulate an input light by the electrical drive signal, the optical modulator having a first waveguide pair, a second waveguide pair, and a phase shifter that provides a phase difference between light waves travelling through the first waveguide pair and the second waveguide pair; and a controller configured to set the phase difference at the phase shifter to 0+n*π radians, where it is an integer, when a modulation scheme of the optical modulator is changed from a first scheme using four or more phase values to a second scheme using two phase values.

14. 发明授权

US10419263B2 Transmission system and method 有权
公开(公告)号：US10419263B2
公开(公告)日：2019-09-17
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： H04K1/02 , H04L27/36 , H03C3/40 , H04L1/00 , H03F1/00 , H04L25/49 , H03F3/24 , H03C5/00 , H04B1/04
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.

15. 发明授权

US10219049B2 Optical reception apparatus, optical transmission apparatus, optical communication system, and skew adjusting method 有权
公开(公告)号：US10219049B2
公开(公告)日：2019-02-26
申请号：US16004704
申请日：2018-06-11
申请人： FUJITSU LIMITED
发明人： Yoshitaka Nomura , Hisao Nakashima , Tomofumi Oyama , Yuichi Akiyama , Takeshi Hoshida
IPC分类号： H04Q3/52 , H04Q11/00
摘要： An optical reception apparatus includes an equalization processor, an extraction unit, a first ratio calculator, and an instruction transmitter. The equalization processor suppresses fluctuations in amplitude of an electrical signal obtained by converting an optical signal including a plurality of pilot symbols subjected to BPSK modulation by an optical transmission apparatus. The extraction unit extracts the pilot symbols from the electrical signal with suppressed fluctuations in amplitude. The first ratio calculator calculates a ratio of an amplitude component to a phase component of each of the pilot symbols extracted by the extraction unit. The instruction transmitter transmits information relating to skew adjustment based on the ratio of the amplitude component to the phase component calculated by the first ratio calculator for each of different control values to the optical transmission apparatus.

16. 发明申请

US20180376226A1 OPTICAL RECEPTION APPARATUS, OPTICAL TRANSMISSION APPARATUS, OPTICAL COMMUNICATION SYSTEM, AND SKEW ADJUSTING METHOD 审中-公开
公开(公告)号：US20180376226A1
公开(公告)日：2018-12-27
申请号：US16004704
申请日：2018-06-11
申请人： Fujitsu Limited
发明人： Yoshitaka Nomura , Hisao Nakashima , Tomofumi Oyama , Yuichi Akiyama , Takeshi Hoshida
IPC分类号： H04Q3/52 , H04Q11/00
摘要： An optical reception apparatus includes an equalization processor, an extraction unit, a first ratio calculator, and an instruction transmitter. The equalization processor suppresses fluctuations in amplitude of an electrical signal obtained by converting an optical signal including a plurality of pilot symbols subjected to BPSK modulation by an optical transmission apparatus. The extraction unit extracts the pilot symbols from the electrical signal with suppressed fluctuations in amplitude. The first ratio calculator calculates a ratio of an amplitude component to a phase component of each of the pilot symbols extracted by the extraction unit. The instruction transmitter transmits information relating to skew adjustment based on the ratio of the amplitude component to the phase component calculated by the first ratio calculator for each of different control values to the optical transmission apparatus.

17. 发明授权

US09887798B2 Transmission apparatus, reception apparatus and modulation method 有权
公开(公告)号：US09887798B2
公开(公告)日：2018-02-06
申请号：US15333671
申请日：2016-10-25
申请人： FUJITSU LIMITED
发明人： Yoshitaka Nomura , Hisao Nakashima , Yuichi Akiyama , Takeshi Hoshida
IPC分类号： H04J14/02 , H04B10/516
CPC分类号： H04J14/0298 , H04B10/5161 , H04B10/548 , H04B10/6165
摘要： There is provided a transmission apparatus configured to transmit an optical signal by using a plurality of subcarriers, the transmission apparatus includes: a plurality of modulators, a modulator of the plurality of modulators configured to be capable of changing a modulation format corresponding to a subcarrier of the plurality of subcarriers; a controller configured to control the modulation format for the modulator so as to use a first modulation format and a second modulation format for two or more subcarriers among the plurality of subcarriers and include subcarriers that are different in at least one of a first timing and a second timing of the first modulation format; and a multiplexer configured to multiplex signals modulated by the plurality of modulators.

18. 发明授权

US09667344B2 Optical transmission apparatus and detection apparatus 有权
公开(公告)号：US09667344B2
公开(公告)日：2017-05-30
申请号：US14794873
申请日：2015-07-09
申请人： FUJITSU LIMITED
发明人： Yuichi Akiyama
IPC分类号： H04B10/035 , H04B10/079 , H04B10/50 , H04B10/58 , 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.

19. 发明申请

US20170026114A1 OPTICAL TRANSMISSION DEVICE, TRANSMISSION SYSTEM, AND TRANSMISSION METHOD 有权
标题翻译：光传输设备，传输系统和传输方法
公开(公告)号：US20170026114A1
公开(公告)日：2017-01-26
申请号：US15209166
申请日：2016-07-13
申请人： FUJITSU LIMITED
发明人： KIICHI SUGITANI , Takahito Tanimura , Hisao Nakashima , Yuichi Akiyama
IPC分类号： H04B10/079 , H04B10/25
CPC分类号： H04B10/07953 , H04B10/25 , H04J14/02
摘要： There is provided an optical transmission device including: a generator configured to convert an electric signal into a plurality of parallel signals, modulate the plurality of parallel signals, shift center frequencies of spectra of the plurality of modulated parallel signals into different frequencies, so as to generate signals accommodated in a plurality of sub-channels each having different center frequencies, and generate a multiplexed signal by multiplexing the signals accommodated in the plurality of sub-channels; a transmitter configured to optical-modulate the multiplexed signal and transmit the optical-modulated signal to an optical reception device; and a controller configured to control a frequency spacing between adjacent sub-channels of the plurality of sub-channels, based on a monitoring result of reception characteristics of the signals accommodated in the plurality of sub-channels within the multiplexed signal in the optical reception device.
摘要翻译：提供了一种光传输装置，包括：发生器，被配置为将电信号转换成多个并行信号，调制多个并行信号，将多个调制的并行信号的频谱的中心频率转换成不同的频率，以便产生容纳在每个具有不同中心频率的多个子信道中的信号，并且通过复用多个子信道中容纳的信号来产生多路复用信号; 发送器，被配置为对所述多路复用信号进行光调制，并将所述光调制信号发送到光接收装置; 以及控制器，其被配置为基于在所述光接收装置中的复用信号内的多个子信道中容纳的信号的接收特性的监视结果来控制所述多个子信道的相邻子信道之间的频率间隔。

20. 发明授权

US09419720B2 Optical signal transmitter 有权
标题翻译：光信号发射机
公开(公告)号：US09419720B2
公开(公告)日：2016-08-16
申请号：US14629123
申请日：2015-02-23
申请人： FUJITSU LIMITED
发明人： Yuichi Akiyama , Hideyuki Miyata , Takeshi Hoshida
IPC分类号： H04J14/00 , H04B10/54 , G02F1/01 , H04B10/50 , H04B10/532 , H04B10/556 , H04J14/06
CPC分类号： H04B10/54 , G02F1/0123 , G02F1/0136 , H04B10/505 , H04B10/532 , H04B10/5561 , H04J14/06
摘要： An optical signal transmitter includes first and second modulation units, a combiner, and a control unit. The first and second modulation units generate first and second modulated optical signals, respectively. The combiner combines the first and second modulated optical signals to generate a polarization multiplexed optical signal. The control unit controls at least one of the first and second modulation units so that the optical powers of the first and second modulated optical signals become approximately equal to each other.
摘要翻译：光信号发射机包括第一和第二调制单元，组合器和控制单元。第一和第二调制单元分别产生第一和第二调制光信号。组合器组合第一和第二调制光信号以产生偏振复用光信号。控制单元控制第一和第二调制单元中的至少一个，使得第一和第二调制光信号的光功率彼此近似相等。

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