公开(公告)号：US20170230120A1

公开(公告)日：2017-08-10

申请号：US15407063

申请日：2017-01-16

申请人： FUJITSU LIMITED

发明人： Ryou Okabe ,  Toshiki Tanaka ,  Tomoo Takahara ,  Masato Nishihara

IPC分类号： H04B10/61 ,  H04B10/079

CPC分类号： H04B10/6165 ,  H04B10/0779 ,  H04B10/0795 ,  H04B10/07955

摘要： A method for estimating characteristics of an optical receiver includes: a generating process, a monitoring process, a suppressing process, a guiding process and an estimating process. The generating process generates a modulated optical signal based on an oscillation signal. The monitoring process monitors an optical spectrum of the modulated optical signal or a spectrum of an electric signal obtained by performing optical-to-electrical conversion on the modulated optical signal. The suppressing process suppresses a modulation component of an upper sideband or a lower sideband of the modulated optical signal based on the optical spectrum of the modulated optical signal or the spectrum of the electric signal. The guiding process guides the modulated optical signal in which the modulation component is suppressed to the optical receiver. The estimating process estimates the characteristics of the optical receiver based on an output signal of the optical receiver.

公开(公告)号：US20150333827A1

公开(公告)日：2015-11-19

申请号：US14672527

申请日：2015-03-30

申请人： FUJITSU LIMITED

发明人： Ryou Okabe ,  Shigeki Watanabe

IPC分类号： H04B10/079 ,  H04J14/02

CPC分类号： H04B10/07955 ,  H04B10/5057 ,  H04B10/548 ,  H04J14/02 ,  H04J14/0298

摘要： An optical multiplexing includes: a monitor configured to detect power of an optical component including a frequency component of a cross point between spectra of a first sub-carrier signal and a second sub-carrier signal; and a controller configured to control a modulation timing of a data symbol of the second sub-carrier signal according to the power detected by the monitor, wherein the second sub-carrier signal is multiplexed to a carrier to be adjacent to the first sub-carrier signal multiplexed to the carrier so as to generate an optical Orthogonal Frequency Divisional Multiplexing (OFDM) signal in which an interference between the first and second sub-carrier signals is suppressed.

摘要翻译： 光复用包括：监视器，被配置为检测包括第一副载波信号和第二副载波信号的频谱之间的交叉点的频率分量的光学部件的功率; 以及控制器，被配置为根据由监视器检测到的功率来控制第二副载波信号的数据符号的调制定时，其中第二副载波信号被复用到与第一子载波相邻的载波 信号复用到载波上，以便产生抑制第一和第二副载波信号之间的干扰的光学正交频分复用（OFDM）信号。

公开(公告)号：US09077470B2

公开(公告)日：2015-07-07

申请号：US13767077

申请日：2013-02-14

申请人： FUJITSU LIMITED

发明人： Yutaka Kai ,  Shigeki Watanabe ,  Ryou Okabe ,  Tomoyuki Kato

IPC分类号： H04J14/02 ,  H04J14/00

CPC分类号： H04J14/00 ,  H04J14/02 ,  H04J14/0256 ,  H04J14/0298

摘要： An optical transmission system includes: multiplex transmitting devices, each configured to modulate, with an optical carrier, a data signal modulated into light by an optical modulator in a non-linear optical medium arranged on a transmission path so as to multiplex the data signal into the optical carrier, the data signal having a frequency different in each of the multiplex transmitting devices; a receiving device configured to execute optical-to-electrical conversion on the optical carrier received from the transmission path so as to execute reception process of the data signals multiplexed by the multiplex transmitting devices; and a management device configured to specify a frequency band to be used, based on a modulation band of each of the optical modulators, and manage assignment of the frequency of each of the data signals within the frequency band to be used so as to avoid an effect of harmonics generated upon the optical-to-electrical conversion.

摘要翻译： 一种光传输系统包括：多路传输设备，每个被配置成用光载波调制由布置在传输路径上的非线性光介质中的光调制器调制成光的数据信号，以将数据信号复用成 所述光载波，所述数据信号具有在所述多路传输装置中的每一者中不同的频率; 接收装置，被配置为在从所述传输路径接收的所述光载波上执行光电转换，以执行由所述多路传输装置复用的数据信号的接收处理; 以及管理装置，其被配置为基于每个光调制器的调制频带来指定要使用的频带，并且管理要使用的频带内的每个数据信号的频率的分配，以避免使用 对光电转换产生的谐波的影响。

公开(公告)号：US20170272161A1

公开(公告)日：2017-09-21

申请号：US15413906

申请日：2017-01-24

申请人： FUJITSU LIMITED

发明人： Yutaka Kai ,  Tomoo Takahara ,  Toshiki Tanaka ,  Masato Nishihara ,  Ryou Okabe

IPC分类号： H04B10/2507 ,  H04L7/00 ,  H04B10/66 ,  H04B10/079 ,  H04B10/40

CPC分类号： H04B10/2507 ,  H04B10/079 ,  H04B10/25133 ,  H04B10/40 ,  H04B10/66 ,  H04B10/67 ,  H04J3/0644 ,  H04J3/0647 ,  H04L7/0075

摘要： An apparatus includes a receiver configured to receive a signal that has traveled an optical transmission line without returning output from an optical transmitting device and synchronize with the optical transmitting device in order to demodulate the signal; a dispersion compensator configured to compensate for wavelength dispersion caused by transmission of the signal; an acquisition circuit configured to acquire a transmitting timing at which the signal has been transmitted from the optical transmitting device; a calculation circuit configured to calculate a transmission time period from the optical transmitting device to the receiver from the transmitting timing and a receiving timing at which the signal has been received with the receiver; and an amount setting circuit configured to adjust a dispersion compensation amount of the dispersion compensator in accordance with the transmission time period.

公开(公告)号：US20170093515A1

公开(公告)日：2017-03-30

申请号：US15264894

申请日：2016-09-14

申请人： FUJITSU LIMITED

发明人： Toshiki Tanaka ,  Ryou Okabe ,  Tomoo Takahara ,  MASATO NISHIHARA ,  YUTAKA KAI

IPC分类号： H04J14/02 ,  H04B10/564

CPC分类号： H04J14/0221 ,  H04B10/07957 ,  H04B10/564 ,  H04B10/572

摘要： There is proved an optical transmission system including: a transmitter configured to transmit an optical signal modulated with a discrete multi-tone (DMT) drive signal; a filter capable of changing a wavelength of the optical signal input from the transmitter; a monitor configured to monitor a power of the optical signal passed through the filter; and at least one processor configured to: set a center wavelength of the filter, shift the center wavelength, detect a change in the power monitored by the monitor, identify a carrier component of the optical signal based on the change in the power, and control a relative relationship between a transmission characteristic of the filter and a wavelength of the carrier component so that the carrier component is included in the optical signal and one of an upper sideband and a lower sideband of the optical signal is at least partially removed by the filter.

公开(公告)号：US20170078027A1

公开(公告)日：2017-03-16

申请号：US15244169

申请日：2016-08-23

申请人： FUJITSU LIMITED

发明人： Ryou Okabe ,  Tomoo Takahara ,  Toshiki Tanaka ,  MASATO NISHIHARA

IPC分类号： H04B10/58 ,  H04B10/079

CPC分类号： H04B10/58 ,  H04B10/07953 ,  H04B10/548 ,  H04B10/564 ,  H04J14/0298

摘要： A transmission apparatus including: a waveform shaper that performs spectrum correction on an optical signal converted from an electrical signal encoded by OFDM (Orthogonal Frequency Division Multiplexing); a converter that converts the optical signal on which the waveform shaper has performed the spectrum correction, into the electrical signal; and a nonlinear compensator that compensates for a nonlinear distortion with respect to the electrical signal converted by the converter.

摘要翻译： 一种传输装置，包括：波形整形器，对由OFDM（正交频分复用）编码的电信号转换的光信号进行频谱校正; 将波形整形器进行了光谱校正的光信号转换为电信号的转换器; 以及非线性补偿器，其相对于由转换器转换的电信号补偿非线性失真。

公开(公告)号：US10050714B2

公开(公告)日：2018-08-14

申请号：US15404569

申请日：2017-01-12

申请人： FUJITSU LIMITED

发明人： Masato Nishihara ,  Toshiki Tanaka ,  Tomoo Takahara ,  Ryou Okabe

IPC分类号： H04B10/079 ,  H04B10/548 ,  H04B10/00

摘要： There is provided a transmission apparatus includes: a first modulator configured to modulate a first electrical signal to a second electrical signal that is a multicarrier signal including a plurality of subcarriers to which transmission capacities are allocated, respectively; a light source configured to generate light having a predetermined wavelength; a second modulator configured to modulate the light generated by the light source to an optical signal, based on the second electrical signal modulated by the first modulator; and a processor configured to: measure a first frequency distribution of intensity of the second electrical signal modulated by the first modulator, measure a second frequency distribution of intensity of the optical signal modulated by the second modulator, compare the first frequency distribution and the second frequency distribution, and control modulation characteristics of the second modulator according to a result of comparing the first frequency distribution and the second frequency distribution.

公开(公告)号：US09923640B2

公开(公告)日：2018-03-20

申请号：US15244169

申请日：2016-08-23

申请人： FUJITSU LIMITED

发明人： Ryou Okabe ,  Tomoo Takahara ,  Toshiki Tanaka ,  Masato Nishihara

IPC分类号： H04B10/58 ,  H04B10/079 ,  H04J14/02 ,  H04B10/564

CPC分类号： H04B10/58 ,  H04B10/07953 ,  H04B10/548 ,  H04B10/564 ,  H04J14/0298

摘要： A transmission apparatus including: a waveform shaper that performs spectrum correction on an optical signal converted from an electrical signal encoded by OFDM (Orthogonal Frequency Division Multiplexing); a converter that converts the optical signal on which the waveform shaper has performed the spectrum correction, into the electrical signal; and a nonlinear compensator that compensates for a nonlinear distortion with respect to the electrical signal converted by the converter.

公开(公告)号：US20170070286A1

公开(公告)日：2017-03-09

申请号：US15253431

申请日：2016-08-31

申请人： FUJITSU LIMITED

发明人： MASATO NISHIHARA ,  Toshiki Tanaka ,  YUTAKA KAI ,  Ryou Okabe ,  Tomoo Takahara

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

CPC分类号： H04B10/07957 ,  H04B10/07953 ,  H04B10/572 ,  H04J14/0239 ,  H04J14/0298

摘要： A bit allocation method is used in an optical transmission system that transmits multicarrier signals of different wavelengths in wavelength division multiplexing. Frequency characteristics of subcarriers included in the multicarrier signals are different between the respective multicarrier signals. The method includes: measuring transmission characteristics of the subcarriers included in corresponding multicarrier signals at different subcarrier frequencies; and determining a number of bits to be allocated to each of the subcarriers included in each of the multicarrier signals based on the transmission characteristics measured at the different subcarrier frequencies.

摘要翻译： 在波分复用中发送不同波长的多载波信号的光传输系统中使用比特分配方法。 包含在多载波信号中的子载波的频率特性在各个多载波信号之间是不同的。 该方法包括：以不同子载波频率测量包含在相应多载波信号中的子载波的传输特性; 以及基于在不同子载波频率处测量的传输特性来确定要分配给包括在每个多载波信号中的每个子载波的比特数。

公开(公告)号：US20160218812A1

公开(公告)日：2016-07-28

申请号：US14992272

申请日：2016-01-11

申请人： FUJITSU LIMITED

发明人： Ryou Okabe ,  Masato Nishihara ,  Toshiki Tanaka ,  Yutaka Kai ,  Tomoo Takahara

IPC分类号： H04B10/60

CPC分类号： H04B10/60 ,  H04B10/0775 ,  H04B10/25133 ,  H04B10/67 ,  H04B2210/252

摘要： An optical reception apparatus may include a receiver, a monitor, and a controller. The optical reception apparatus receives multi-carrier modulated signal light modulated by a multi-carrier modulation scheme. The multi-carrier modulation scheme is available to allocate different transmission conditions for each of a plurality of subcarriers in accordance with transmission characteristics of the subcarriers. The receiver may receive from an optical transmission line a training signal light allocated with the same transmission conditions for each of the subcarriers. The monitor may monitor the transmission characteristics of the training signal light to detect a frequency at which a dip of the transmission characteristics occurs. The controller may control, based on the frequency detected by the monitor, a dispersion compensation for the multi-carrier modulated signal light having received a dispersion from the optical transmission line.

摘要翻译： 光接收装置可以包括接收机，监视器和控制器。 光接收装置接收由多载波调制方式调制的多载波调制信号。 多载波调制方案可用于根据子载波的传输特性为多个子载波中的每一个分配不同的传输条件。 接收机可以从光传输线接收为每个子载波分配相同传输条件的训练信号光。 监视器可以监视训练信号光的传输特性，以检测出现传输特性的下降的频率。 控制器可以基于由监视器检测到的频率来控制从光传输线接收到色散的多载波调制信号光的色散补偿。