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1. 发明授权

US11929784B2 Wavelength dispersion compensation apparatus and wavelength dispersion compensation method 有权
公开(公告)号：US11929784B2
公开(公告)日：2024-03-12
申请号：US17797266
申请日：2020-02-12
申请人： NIPPON TELEGRAPH AND TELEPHONE CORPORATION
发明人： Shimpei Shimizu , Takushi Kazama , Takayuki Kobayashi , Yutaka Miyamoto
IPC分类号： H04B10/2507 , H04B10/2513 , H04B10/2525 , H04B10/61
CPC分类号： H04B10/2525 , H04B10/2507 , H04B10/2513 , H04B10/6161
摘要： A wavelength dispersion compensating apparatus, including: a signal light generating unit which generates, from predetermined signal light, signal light having a phase correlation centered on a degenerate frequency of a phase sensitive amplifier; a dispersion compensation transmission path which compensates for a wavelength dispersion of the predetermined signal light included in the signal light; a filter which compensates for a residual wavelength dispersion after compensation by the dispersion compensation transmission path of the predetermined signal light included in the signal light; a phase sensitive amplifier which amplifies the signal light input via the dispersion compensation transmission path and the filter; a residual wavelength dispersion calculating unit which calculates a residual wavelength dispersion amount based on a measurement result of output light amplified by the phase sensitive amplifier; and a filter control unit which controls the filter so as to add a wavelength dispersion that cancels out the calculated residual wavelength dispersion amount to the predetermined signal light.

2. 发明授权

US11742950B2 Wavelength dispersion amount calculation apparatus and wavelength dispersion amount calculation method 有权
公开(公告)号：US11742950B2
公开(公告)日：2023-08-29
申请号：US17777569
申请日：2019-11-28
申请人： NIPPON TELEGRAPH AND TELEPHONE CORPORATION
发明人： Shimpei Shimizu , Takayuki Kobayashi , Masanori Nakamura , Yutaka Miyamoto
IPC分类号： H04B10/61 , H04B10/2513 , H04B10/079
CPC分类号： H04B10/2513 , H04B10/07951 , H04B10/6161
摘要： A computation unit uses an assumed chromatic dispersion amount to compensate for dispersion of a coherently received optical signal and performs arithmetic of a signal power of the optical signal that is dispersion compensated. The computation unit performs computation of an evaluation function when a signal power and a delayed signal power obtained by applying a predetermined delay to the signal power satisfy a threshold condition. The evaluation function is a function for evaluating whether the assumed chromatic dispersion amount is a chromatic dispersion amount of the optical signal using the difference between the signal power and the delayed signal power. The chromatic dispersion amount calculation unit calculates a chromatic dispersion amount of the optical signal based on the computation result of the evaluation function by the computation unit when each of a plurality of different assumed chromatic dispersion amounts is used.

3. 发明授权

US11283527B2 Optical transmitting system, optical transmitting apparatus, optical receiving apparatus and transfer function estimating method 有权
公开(公告)号：US11283527B2
公开(公告)日：2022-03-22
申请号：US17311928
申请日：2019-12-04
申请人： NIPPON TELEGRAPH AND TELEPHONE CORPORATION
发明人： Masanori Nakamura , Fukutaro Hamaoka , Hiroshi Yamazaki , Munehiko Nagatani , Takayuki Kobayashi , Yutaka Miyamoto
IPC分类号： H04B10/04 , H04B10/58 , H04B10/69
摘要： An optical transmission system includes an optical transmitter and an optical receiver. The optical transmitter includes a low speed signal generation unit configured to generate, based on an input signal of a transmission data sequence and a signal obtained by cyclically shifting a spectrum of the input signal, a plurality of low speed signals, a high speed signal generation unit configured to digital-to-analog convert and synthesize the plurality of low speed signals to generate a high speed signal, and an optical modulation unit configured to transmit an optical signal obtained by modulation of the high speed signal to a transmission path. The optical receiver includes a reception unit configured to receive the optical signal from the transmission path and output the high speed signal obtained from the optical signal that is received, an optical-receiver-side high speed signal compensation unit configured to compensate, based on the high speed signal output by the reception unit and a signal obtained by cyclically shifting a spectrum of the high speed signal, for the high speed signal, and a reception data decoding unit configured to decode the high speed signal compensated by the optical-receiver-side high speed signal compensation unit to restore binary information included in the optical signal transmitted by the optical transmitter.

4. 发明授权

US12034269B2 Light amplifying relay system 有权
公开(公告)号：US12034269B2
公开(公告)日：2024-07-09
申请号：US17258408
申请日：2019-07-05
申请人： NIPPON TELEGRAPH AND TELEPHONE CORPORATION
发明人： Takayuki Mizuno , Koki Shibahara , Akira Isoda , Takayuki Kobayashi , Yutaka Miyamoto
IPC分类号： H01S3/067 , H01S3/094 , H01S3/10 , H01S3/30 , H04B10/2581 , H04B10/291 , H04B10/293 , H04J14/04
CPC分类号： H01S3/30 , H01S3/06737 , H01S3/06779 , H01S3/094007 , H01S3/10015 , H04B10/2581 , H04B10/2916 , H04B10/293 , H04J14/04
摘要： An optical amplifier repeater system includes an optical fiber propagating a light beam in a plurality of propagation modes and an optical amplifier repeater amplifying the light beam propagated through the optical fiber. The optical amplifier repeater includes an optical demultiplexer demultiplexing the light beam in the plurality of propagation modes propagated through the optical fiber into a plurality of single-mode light beams, an optical amplifier amplifying, by simultaneous pumping, intensities of the plurality of single-mode light beams using a light beam generated by one pumping light source, an optical multiplexer multiplexing the plurality of single-mode light beams amplified by the optical amplifier into a light beam in the plurality of propagation modes, and an optical intensity adjusting unit adjusting the intensity of each of the plurality of single-mode light beams at least one of before or after the amplification by the optical amplifier. The optical intensity adjusting unit performs the adjustment by amplifying or attenuating the optical intensity of each of the plurality of single-mode light beams in an individual optical path through which the single-mode light beam is propagated.

5. 发明授权

US11632185B2 Signal processing method, signal processing apparatus and communication system 有权
公开(公告)号：US11632185B2
公开(公告)日：2023-04-18
申请号：US17433149
申请日：2020-01-31
申请人： NIPPON TELEGRAPH AND TELEPHONE CORPORATION
发明人： Takayuki Kobayashi , Masanori Nakamura , Fukutaro Hamaoka , Yutaka Miyamoto
IPC分类号： H04L27/01 , H04J14/06 , H04B10/2507 , H04B10/61 , H04L27/38
摘要： A receiver convolutes each of a real component and an imaginary component of each polarization of a polarization-multiplexed reception signal with an impulse response for compensating for frequency characteristics of the receiver and a complex impulse response for wavelength dispersion compensation, and generates, as input signals, the convoluted real component and imaginary component of each polarization and phase conjugations thereof, for each polarization. The receiver generates, for each polarization, a first addition signal obtained by multiplying each of the real component and the imaginary component of each polarization by a complex impulse response, thereafter adding together the multiplied real component and imaginary component, and applying a phase rotation for frequency offset compensation to the added components, and a second addition signal obtained by multiplying each of the phase conjugation of the real component of and the phase conjugation of the imaginary component of each polarization by a complex impulse response, thereafter adding together the multiplied phase conjugations, and applying a phase rotation opposite to the phase rotation for frequency offset compensation to the added phase conjugations, and adds or subtracts a transmission data bias correction signal to or from a signal obtained by adding together the generated first addition signal and second addition signal.

6. 发明授权

US09520947B2 Signal generating circuit, optical signal transmitting apparatus, signal receiving circuit, method for establishing optical signal synchronization, and optical signal synchronization system 有权
公开(公告)号：US09520947B2
公开(公告)日：2016-12-13
申请号：US14550262
申请日：2014-11-21
申请人： Nippon Telegraph and Telephone Corporation
发明人： Koichi Ishihara , Takayuki Kobayashi , Riichi Kudo , Yasushi Takatori , Munehiro Matsui , Masato Mizoguchi , Akihide Sano , Shogo Yamanaka , Etsushi Yamazaki , Yutaka Miyamoto , Eiji Yoshida , Tadao Nakagawa
IPC分类号： H04B10/06 , H04B10/50 , H04B10/079 , H04B10/2513 , H04B10/556 , H04B10/61 , H04L7/027
CPC分类号： H04B10/50 , H04B10/07951 , H04B10/2513 , H04B10/556 , H04B10/616 , H04B10/6161 , H04L7/027
摘要： To enable signal position detection, frequency offset compensation, clock offset compensation, and chromatic dispersion amount estimation in a communication system based on coherent detection using an optical signal, even on a signal having a great offset in an arrival time depending on a frequency due to chromatic dispersion. An optical signal transmitting apparatus generates specific frequency band signals having power concentrated on two or more specific frequencies and transmits a signal including the specific frequency band signals. An optical signal receiving apparatus converts a received signal into a digital signal, detects positions of the specific frequency band signals from the converted digital signal, estimates frequency positions of the detected specific frequency band signals, and detects a frequency offset between an optical signal receiving apparatus and an optical signal transmitting apparatus. Moreover, the optical signal receiving apparatus detects a clock offset between the optical signal receiving apparatus and the optical signal transmitting apparatus from an interval between the estimated frequency positions of the specific frequency band signals. Furthermore, the optical signal receiving apparatus estimates temporal positions of the detected specific frequency band signals and detects a chromatic dispersion amount from a difference between the temporal positions of the specific frequency band signals corresponding to different frequencies.

7. 发明申请

US20150078765A1 SIGNAL GENERATING CIRCUIT, OPTICAL SIGNAL TRANSMITTING APPARATUS, SIGNAL RECEIVING CIRCUIT, METHOD FOR ESTABLISHING OPTICAL SIGNAL SYNCHRONIZATION, AND OPTICAL SIGNAL SYNCHRONIZATION SYSTEM 审中-公开
公开(公告)号：US20150078765A1
公开(公告)日：2015-03-19
申请号：US14550262
申请日：2014-11-21
申请人： Nippon Telegraph and Telephone Corporation
发明人： Koichi Ishihara , Takayuki Kobayashi , Riichi Kudo , Yasushi Takatori , Munehiro Matsui , Masato Mizoguchi , Akihide Sano , Shogo Yamanaka , Etsushi Yamazaki , Yutaka Miyamoto , Eiji Yoshida , Tadao Nakagawa
IPC分类号： H04B10/61
CPC分类号： H04B10/50 , H04B10/07951 , H04B10/2513 , H04B10/556 , H04B10/616 , H04B10/6161 , H04L7/027
摘要： To enable signal position detection, frequency offset compensation, clock offset compensation, and chromatic dispersion amount estimation in a communication system based on coherent detection using an optical signal, even on a signal having a great offset in an arrival time depending on a frequency due to chromatic dispersion. An optical signal transmitting apparatus generates specific frequency band signals having power concentrated on two or more specific frequencies and transmits a signal including the specific frequency band signals. An optical signal receiving apparatus converts a received signal into a digital signal, detects positions of the specific frequency band signals from the converted digital signal, estimates frequency positions of the detected specific frequency band signals, and detects a frequency offset between an optical signal receiving apparatus and an optical signal transmitting apparatus. Moreover, the optical signal receiving apparatus detects a clock offset between the optical signal receiving apparatus and the optical signal transmitting apparatus from an interval between the estimated frequency positions of the specific frequency band signals. Furthermore, the optical signal receiving apparatus estimates temporal positions of the detected specific frequency band signals and detects a chromatic dispersion amount from a difference between the temporal positions of the specific frequency band signals corresponding to different frequencies.

8. 发明申请

US20150078762A1 SIGNAL GENERATING CIRCUIT, OPTICAL SIGNAL TRANSMITTING APPARATUS, SIGNAL RECEIVING CIRCUIT, METHOD FOR ESTABLISHING OPTICAL SIGNAL SYNCHRONIZATION, AND OPTICAL SIGNAL SYNCHRONIZATION SYSTEM 审中-公开
标题翻译：信号发生电路，光信号发送装置，信号接收电路，建立光信号同步的方法和光信号同步系统
公开(公告)号：US20150078762A1
公开(公告)日：2015-03-19
申请号：US14550424
申请日：2014-11-21
申请人： Nippon Telegraph and Telephone Corporation
发明人： Koichi Ishihara , Takayuki Kobayashi , Riichi Kudo , Yasushi Takatori , Munehiro Matsui , Masato Mizoguchi , Akihide Sano , Shogo Yamanaka , Etsushi Yamazaki , Yutaka Miyamoto , Eiji Yoshida , Tadao Nakagawa
IPC分类号： H04B10/50
CPC分类号： H04B10/50 , H04B10/07951 , H04B10/2513 , H04B10/556 , H04B10/616 , H04B10/6161 , H04L7/027
摘要： To enable signal position detection, frequency offset compensation, clock offset compensation, and chromatic dispersion amount estimation in a communication system based on coherent detection using an optical signal, even on a signal having a great offset in an arrival time depending on a frequency due to chromatic dispersion. An optical signal transmitting apparatus generates specific frequency band signals having power concentrated on two or more specific frequencies and transmits a signal including the specific frequency band signals. An optical signal receiving apparatus converts a received signal into a digital signal, detects positions of the specific frequency band signals from the converted digital signal, estimates frequency positions of the detected specific frequency band signals, and detects a frequency offset between an optical signal receiving apparatus and an optical signal transmitting apparatus. Moreover, the optical signal receiving apparatus detects a clock offset between the optical signal receiving apparatus and the optical signal transmitting apparatus from an interval between the estimated frequency positions of the specific frequency band signals. Furthermore, the optical signal receiving apparatus estimates temporal positions of the detected specific frequency band signals and detects a chromatic dispersion amount from a difference between the temporal positions of the specific frequency band signals corresponding to different frequencies.
摘要翻译：为了使基于使用光信号的相干检测的通信系统中的信号位置检测，频率偏移补偿，时钟偏移补偿和色散量估计，即使在到达时间上具有很大偏移的信号，这取决于由于色散。光信号发送装置产生具有集中在两个或更多个特定频率上的功率的特定频带信号，并发送包括特定频带信号的信号。光信号接收装置将接收到的信号转换为数字信号，检测来自转换的数字信号的特定频带信号的位置，估计检测到的特定频带信号的频率位置，并检测光信号接收装置和光信号发送装置。此外，光信号接收装置从特定频带信号的估计频率位置之间的间隔检测光信号接收装置和光信号发送装置之间的时钟偏移。此外，光信号接收装置估计检测到的特定频带信号的时间位置，并且根据与不同频率对应的特定频带信号的时间位置之间的差来检测色散量。

9. 发明授权

US10805905B2 Terminal station device and bandwidth allocation method 有权
公开(公告)号：US10805905B2
公开(公告)日：2020-10-13
申请号：US15562114
申请日：2016-03-28
申请人： NIPPON TELEGRAPH AND TELEPHONE CORPORATION
发明人： Hiroshi Ou , Tatsuya Shimada , Takayuki Kobayashi , Jun Terada
IPC分类号： H04W72/04 , H04L12/44
摘要： Information on allocation of a bandwidth of uplink communication of each of user devices is extracted from information notified from an upper-level device on the uplink communication of the user devices. Correspondence information is created to indicate a correspondence among the upper-level device, the terminal device, the lower-level device, and the user device. A start time point of the uplink communication of the terminal device and an information amount of signals for which transmission of the uplink communication of the terminal device is allowed are allocated to the terminal device on the basis of the information on allocation of the bandwidth of the uplink communication of each of the user devices and the correspondence information.

10. 发明授权

US10555330B2 Terminal station apparatus and band allocation method 有权
公开(公告)号：US10555330B2
公开(公告)日：2020-02-04
申请号：US16075205
申请日：2017-01-23
申请人： NIPPON TELEGRAPH AND TELEPHONE CORPORATION
发明人： Hiroshi Ou , Takayuki Kobayashi , Daisuke Hisano , Tatsuya Shimada
IPC分类号： H04W72/12 , H04L12/44 , H04J3/16 , H04W56/00 , H04W72/04
摘要： A terminal station device is a terminal station device of a communication system in which a high-order device, the terminal station device, an end-terminal device, and a low-order device are communicably connected in this order, the high-order device notifies the low-order device of resource information indicating a resource that is usable in communication, and thereby the resource is allocated to the low-order device. The terminal station device includes: a band allocation unit that allocates a band that is permitted to be used by the end-terminal device for transmission processing to the terminal station device, based on an interval at which the terminal station device has received the resource information.

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