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21. 发明专利

JP2008211801A Digital phase estimator, digital phase locked loop and optical coherent receiver 有权
标题翻译：数字相位估计器，数字相位锁定和光学相干接收器
公开(公告)号：JP2008211801A
公开(公告)日：2008-09-11
申请号：JP2008045059
申请日：2008-02-26
申请人： Fujitsu Ltd , 富士通株式会社
发明人： TAO ZHENNING , LI LEI , RASMUSSEN JENS C
IPC分类号： H04L27/22 , H04B10/07 , H04B10/516 , H04B10/556 , H04B10/58 , H04B10/61 , H04L7/00
CPC分类号： H04B10/6165 , H04B10/61 , H04B10/611 , H04B10/613
摘要： PROBLEM TO BE SOLVED: To provide a digital phase estimator, a digital phase locked loop and an optical coherent receiver. SOLUTION: The optical coherent receiver includes: a local oscillator laser, for supplying a local oscillator optical signal; an optical 90° frequency mixer, for mixing a received optical signal with the local oscillator optical signal; first and second balancing photoelectric detectors, for converting the optical signals outputted from the optical 90° frequency mixer into baseband electrical signals; first and second analog/digital converters, for respectively converting output signals from the first and the second balancing photoelectric detectors into digital signals; a digital phase locked loop, for compensating a phase difference between a carrier signal of the received optical signal and the local oscillator optical signal, and outputting the compensated signal; and a data recovering unit, for recovering data from the compensated signal. COPYRIGHT: (C)2008,JPO&INPIT
摘要翻译：要解决的问题：提供数字相位估计器，数字锁相环和光学相干接收器。解决方案：光学相干接收机包括：本地振荡器激光器，用于提供本地振荡器光信号; 用于将接收的光信号与本地振荡器光信号混合的光学90°混频器; 第一和第二平衡光电检测器，用于将从光学90°混频器输出的光信号转换成基带电信号; 第一和第二模拟/数字转换器，用于分别将来自第一和第二平衡光电探测器的输出信号转换为数字信号; 数字锁相环，用于补偿所接收的光信号的载波信号与本地振荡器光信号之间的相位差，并输出补偿的信号; 以及数据恢复单元，用于从补偿信号中恢复数据。版权所有（C）2008，JPO＆INPIT

22. 发明专利

JP2008060857A Phase monitor in optical receiver 有权
标题翻译：光接收机相位监测器
公开(公告)号：JP2008060857A
公开(公告)日：2008-03-13
申请号：JP2006234563
申请日：2006-08-30
申请人： Fujitsu Ltd , 富士通株式会社
发明人： ISOMURA AKIHIKO , RASMUSSEN JENS , TAO ZHENNING , MIZUGUCHI NORIAKI , KABURAGI KENICHI
IPC分类号： H04B10/516 , H04B10/07 , H04B10/556 , H04B10/61
CPC分类号： H04B10/677
摘要： PROBLEM TO BE SOLVED: To provide a phase monitor which can adjust a phase of an interferometer without causing the deterioration of a waveform by dithering control, and discriminates not only a size and a code of a phase but also whether a phase of each interferometer is set at a desired phase.
SOLUTION: Branches are categorized into a group 1 comprising first and second branches, and a group 2 comprising third and fourth branches. A signal is taken out from the rear stage of a dual pin photodiode of one branch in the group 1 and the front stage of CDR (Clock Data Recovery). Also, the signal is taken out from the subsequent stage of the CDR of the branch of the other side in the group 1. The taken-out signal passes through a low pass filter and made as an average value of a plurality of symbols of the signal. A signal from the prestage of the CDR and a signal from the subsequent stage are multiplied by a mixer and averaged. This value becomes a value reflecting a phase difference of two delay interferometers of the group 1. Monitoring is similarly carried out for the group 2.
COPYRIGHT: (C)2008,JPO&INPIT
摘要翻译：要解决的问题：提供一种相位监视器，其可以通过抖动控制而不会导致波形劣化而调节干涉仪的相位，并且不仅识别相位的大小和代码，而且判别相位是否相位每个干涉仪被设置在期望的相位。解决方案：分支被分为包括第一和第二分支的组1，以及包括第三和第四分支的组2。信号从组1中的一个分支的双引脚光电二极管的后级和CDR的前级（时钟数据恢复）中取出。此外，信号从组1中的另一侧的分支的CDR的后续级中取出。取出的信号通过低通滤波器并将其作为多个符号的平均值信号。将来自CDR的前置信号和来自后续级的信号的信号乘以混频器并进行平均。该值成为反映组1的两个延迟干涉仪的相位差的值。对于组2也进行监视。版权所有（C）2008，JPO＆INPIT

23. 发明专利

JP2007259426A I/q quadrature modulation transmitter and apparatus and method for monitoring i/q phase bias therein 有权
标题翻译： I / Q四路调制发射机及其I / Q相位漂移监测装置及方法
公开(公告)号：JP2007259426A
公开(公告)日：2007-10-04
申请号：JP2007038688
申请日：2007-02-19
申请人： Fujitsu Ltd , 富士通株式会社
发明人： TAO ZHENNING , JENS RASMUSSEN
IPC分类号： H04L27/36 , H04L27/20
CPC分类号： H04L27/364 , G02F1/0123 , G02F1/2255 , H04B10/5561
摘要： PROBLEM TO BE SOLVED: To monitor and adjust an I/Q phase bias accurately in an I/Q quadrature modulation transmitter.
SOLUTION: The I/Q quadrature modulation transmitter comprises an I-branch 102, a Q-branch 103 provided with a phase element 108, a tap 110, and an I/Q phase differential monitoring apparatus 113. The I/Q phase differential monitoring apparatus 113 is located between the tap 110 and the phase element 108 for monitoring the I/Q phase difference. The I/Q phase differential monitoring apparatus 113 is provided with a squarer 114 for performing a square operation to a signal received from the tap 110, I-branch data 104, Q-branch data 105, a multiplier 116 for multiplying an output 115 from the squarer 114, an averager 118 for averaging an output 117 from the multiplier 116. By controlling a phase shift amount of the phase element 108 in accordance with the monitoring result, the I/Q phase differential is adjusted.
COPYRIGHT: (C)2008,JPO&INPIT
摘要翻译：要解决的问题：在I / Q正交调制发射机中精确监测和调整I / Q相位偏置。解决方案：I / Q正交调制发射机包括I分支102，具有相位元件108的Q分支103，抽头110和I / Q相位差分监视装置113.I / Q 相位差监视装置113位于抽头110和相位元件108之间，用于监视I / Q相位差。 I / Q相位差监视装置113设置有平方器114，用于对从抽头110接收的信号进行平方运算，I分支数据104，Q分支数据105，乘法器116，用于将输出115与平方器114，用于对来自乘法器116的输出117进行平均的平均器118.通过根据监视结果控制相位元件108的相移量，调整I / Q相位差。版权所有（C）2008，JPO＆INPIT

24. 发明专利

JP2007020138A Phase monitor apparatus, phase control apparatus and methods thereof for optical dqpsk receiver 有权
标题翻译：相位监视器装置，相位控制装置及其用于光学DQPSK接收器的方法
公开(公告)号：JP2007020138A
公开(公告)日：2007-01-25
申请号：JP2005305052
申请日：2005-10-19
申请人： Fujitsu Ltd , 富士通株式会社
发明人： TAO ZHENNING , JENS RASMUSSEN , ISOMURA AKIHIKO
IPC分类号： H04B10/516 , H04B10/07 , H04B10/556 , H04B10/58 , H04B10/61
CPC分类号： H04B10/69 , H04B10/677
摘要： PROBLEM TO BE SOLVED: To appropriately adjust a phase shift amount in an interferometer comprised in an optical DQPSK receiver. SOLUTION: An I branch 102 and a Q branch 103 are provided with interferometers 104, 107, balanced optical detectors 110, 113, and data recovery circuits 111, 114, respectively. In the I branch 102, a mixer 116 multiplies an input signal 124 of the data recovery circuit 111 in the I branch 102 by an output signal 129 of the data recovery circuit 114 in the Q branch 103. An averaging section 117 averages an output signal of the mixer 116. A phase control apparatus 112 controls the phase of a phase shifter 106 in the interferometer 104 of the I branch 102 based on the output signal of the averaging section 117. A phase control apparatus 115, in the same manner, controls the phase of a phase shifter 109 in the interferometer 107 of the Q branch 103. COPYRIGHT: (C)2007,JPO&INPIT
摘要翻译：要解决的问题：适当地调整包括在光DQPSK接收机中的干涉仪中的相移量。解决方案：I分支102和Q分支103分别设置有干涉仪104,107，平衡光学检测器110,113和数据恢复电路111,114。在I分支102中，混频器116将I分支102中的数据恢复电路111的输入信号124与Q分支103中的数据恢复电路114的输出信号129相乘。平均部分117将输出信号相位控制装置112基于平均化部分117的输出信号来控制I分支102的干涉仪104中的移相器106的相位。相位控制装置115以相同的方式控制 Q分支103的干涉仪107中的移相器109的相位。版权所有（C）2007，JPO＆INPIT

25. 发明专利

JP2014060712A Updating apparatus and method for equalizer coefficient, receiver, and optical communication system 有权
标题翻译：用于均衡器系统，接收器和光通信系统的更新装置和方法
公开(公告)号：JP2014060712A
公开(公告)日：2014-04-03
申请号：JP2013188206
申请日：2013-09-11
申请人： Fujitsu Ltd , 富士通株式会社
发明人： LIANG DU , TAO ZHENNING
IPC分类号： H04B3/10 , H04B10/077 , H04B10/61
CPC分类号： H04B10/25073 , H04B10/616 , H04B10/6162 , H04L25/03006 , H04L25/0305 , H04L25/03114 , H04L2025/03426 , H04L2025/03592 , H04L2025/0377
摘要： PROBLEM TO BE SOLVED: To apply equalization to signals of various modulation systems, and to reduce the complexity of channel equalization.SOLUTION: An updating apparatus for an equalizer coefficient comprises: a signal receiver receiving a light signal that is transmitted by a transmitter in an optical communication system and that includes transmission data and a constant modulus signal used for updating a coefficient of an equalization filter; a signal processing unit performing coherent detection and analog-to-digital conversion to the light signal to acquire a digital electric signal; and a coefficient update unit updating a coefficient of the equalization filter at a code point corresponding to the constant modulus signal in the digital electric signal.
摘要翻译：要解决的问题：将均衡应用于各种调制系统的信号，并降低信道均衡的复杂度。解决方案：用于均衡器系数的更新装置包括：接收由发射机发射的光信号的信号接收机光通信系统，其包括用于更新均衡滤波器的系数的传输数据和恒模信号; 信号处理单元，对所述光信号执行相干检测和模数转换以获取数字电信号; 以及系数更新单元，在与数字电信号中的恒模信号对应的码点处更新均衡滤波器的系数。

26. 发明专利

JP2014013387A Automatic bias control method, and device used for optical transmitter 有权
标题翻译：自动偏置控制方法和用于光学发射器的装置
公开(公告)号：JP2014013387A
公开(公告)日：2014-01-23
申请号：JP2013124317
申请日：2013-06-13
申请人： Fujitsu Ltd , 富士通株式会社
发明人： YAN MENG , TAO ZHENNING
IPC分类号： G02F1/01
CPC分类号： H04B10/564 , H04B10/50575
摘要： PROBLEM TO BE SOLVED: To provide an automatic bias control method, and a device used for an optical transmitter.SOLUTION: A device comprises: a detection unit that observes output optical power of an I/Q modulator of an optical transmitter; a calculation unit that, on the basis of the output optical power and known modulation data, calculates a bias voltage instruction amount of each of I channel modulators, a Q channel modulator, and a phase modulator of the I/Q modulator; and an adjustment unit that, on the basis of the bias voltage instruction amount of each of the I channel modulators, the Q channel modulator, and the phase modulator, adjusts DC bias voltages on the I channel modulator, the Q channel modulator, and the phase modulator, respectively.
摘要翻译：要解决的问题：提供自动偏置控制方法和用于光发射机的装置。解决方案：一种装置包括：检测单元，其观察光发射机的I / Q调制器的输出光功率; 计算单元，其基于输出光功率和已知调制数据，计算I / Q调制器的每个I信道调制器，Q信道调制器和相位调制器的偏置电压指令量; 以及调整单元，其基于I通道调制器，Q通道调制器和相位调制器中的每一个的偏置电压指令量来调整I通道调制器，Q通道调制器和相位调制器。

27. 发明专利

JP2013219769A Estimation method of mutual phase modulation breakdown and device of the same 有权
标题翻译：相位调制破坏的估计方法及其设备
公开(公告)号：JP2013219769A
公开(公告)日：2013-10-24
申请号：JP2013080721
申请日：2013-04-08
申请人： Fujitsu Ltd , 富士通株式会社
发明人： CAO YINWEN , WEITIAN YANG , TAO ZHENNING
IPC分类号： H04B10/07 , H04B10/2557
CPC分类号： H04B10/2557 , H04B10/2569
摘要： PROBLEM TO BE SOLVED: To quickly and accurately estimate mutual phase modulation breakdown under the action of polarization mode dispersion.SOLUTION: An estimation method of a mutual phase modulation breakdown comprises the steps of: determining, based on a pump Jones matrix of a pump channel and a detection Jones matrix of a detection channel in each optical fiber span except a first optical fiber span (span means section) in an optical fiber transmission system, a relative polarization state rotation matrix between channels caused by polarization mode dispersion in each optical fiber span; and determining, based on the relative polarization state rotation matrix in each optical fiber span, wavelength dispersion of a pump signal in each optical fiber span, differential delay to a detection signal of the pump signal in each optical fiber span, and gain in each optical fiber span, polarization crosstalk and phase noise of the mutual phase modulation breakdown in the optical fiber transmission system.
摘要翻译：要解决的问题：在偏振模色散的作用下快速，准确地估计相互相位调制击穿。解决方案：相位调制击穿的估计方法包括以下步骤：基于泵通道的泵Jones矩阵以及除了光纤传输系统中的第一光纤跨距（跨度装置部分）之外的每个光纤跨段中的检测通道的检测琼斯矩阵，由每个光纤跨度中的偏振模色散导致的通道之间的相对极化状态旋转矩阵 ; 并且基于每个光纤跨度中的相对极化状态旋转矩阵，确定每个光纤跨度中的泵浦信号的波长色散，每个光纤跨度中的泵浦信号的检测信号的差分延迟，以及每个光纤中的增益光纤传输系统中相位调制故障的光纤跨度，极化串扰和相位噪声。

28. 发明专利

JP2012075097A Nonlinear compensation device, and transmitter 有权
标题翻译：非线性补偿装置和发射机
公开(公告)号：JP2012075097A
公开(公告)日：2012-04-12
申请号：JP2011201507
申请日：2011-09-15
申请人： Fujitsu Ltd , 富士通株式会社
发明人： LIANG DU , TAO ZHENNING
IPC分类号： H04B10/2507 , H04B10/532 , H04B10/548 , H04B10/58
CPC分类号： H04B10/2543 , H04B10/2939
摘要： PROBLEM TO BE SOLVED: To reduce the complexity of a structure or a method for compensating nonlinearity of a communication system.SOLUTION: A nonlinear compensation device has: an information acquisition unit acquiring a symbol information sequence of an input pulse signal on a transmission side of a communication system; a perturbation amount calculation unit calculating a weighting sum of pulse interactions among a plurality of items at a plurality of different times to the current time, and acquiring a perturbation amount generated by a nonlinear effect at the current time on a transmission link; and an information compensation unit acquiring the symbol information sequence in which the nonlinearity is reduced at the current time, based on a difference between the symbol information sequence at the current time acquired by the information acquisition unit and the perturbation amount acquired by the perturbation amount calculation unit.
摘要翻译：要解决的问题：降低结构的复杂性或用于补偿通信系统的非线性的方法。解决方案：非线性补偿装置具有：信息获取单元，在通信系统的发送侧获取输入脉冲信号的符号信息序列; 扰动量计算单元，计算多个不同时间的当前时间的多个项目之间的脉冲相互作用的加权和，并且在传输链路上获取当前时间的非线性效应产生的扰动量; 以及信息补偿单元，基于由信息获取单元获取的当前时间的符号信息序列与通过扰动量计算获得的扰动量之间的差异，获取当前时间非线性降低的符号信息序列单元。版权所有（C）2012，JPO＆INPIT

29. 发明专利

JP2012054934A Self-phase modulation noise calculation device, self-phase modulation noise removing device, and optical coherent receiver 有权
标题翻译：自相位调制噪声计算装置，自相位调制噪声消除装置和光耦合接收器
公开(公告)号：JP2012054934A
公开(公告)日：2012-03-15
申请号：JP2011188536
申请日：2011-08-31
申请人： Fujitsu Ltd , 富士通株式会社
发明人： LI LEI , TAO ZHENNING , HOSHIDA GOJI
IPC分类号： H04B10/2507 , H04B10/07 , H04B10/255
CPC分类号： H04B10/0795 , H04B10/255 , H04B10/6163
摘要： PROBLEM TO BE SOLVED: To reduce the calculation complexity of a self-phase modulation noise.SOLUTION: A self-phase modulation noise calculation device has a signal receiver and a calculator. The signal receiver receives an input signal. The calculator is connected with the signal receiver, and calculates a self-phase modulation noise at the present time based on a signal power of a waveform of the input signal at the present time and a sampling time in proximity to the present time.

30. 发明专利

JP2011223563A Coherent receiver and coherent reception method 有权
标题翻译：相关接收者和相关接收方法
公开(公告)号：JP2011223563A
公开(公告)日：2011-11-04
申请号：JP2011059885
申请日：2011-03-17
申请人： Fujitsu Ltd , 富士通株式会社
发明人： CHENG CHANG LEE , HOI JEN CHAN , TAO ZHENNING , TANIMURA TAKAHITO
IPC分类号： H04B10/61 , H04B10/516 , H04B10/532 , H04B10/54 , H04B10/556 , H04B10/58
CPC分类号： H04L25/03019 , H04B10/611 , H04B10/614 , H04L25/0305 , H04L27/3818
摘要： PROBLEM TO BE SOLVED: To improve the efficiency of optical communication using coherent reception.SOLUTION: A coherent receiver includes: a receiver front end for converting a received partial response optical signal into a partial response digital signal; a pre-filter for converting the partial response digital signal into a full response digital signal; an equalizer for equalizing the pre-filtered full response digital signal; a phase recovery device for phase-recovering a signal equalized by the equalizer; and a post-filter for post-filtering a signal phase-recovered by the phase recovering device and returning the full response digital signal to the partial response digital signal. A transfer function of the pre-filter is an approximate inversion of a transfer function of the partial response transfer signal.
摘要翻译：要解决的问题：提高使用相干接收的光通信的效率。相干接收机包括：接收器前端，用于将接收到的部分响应光信号转换为部分响应数字信号; 用于将部分响应数字信号转换为全响应数字信号的预滤波器; 均衡器，用于均衡预滤波的全响应数字信号; 相位恢复装置，用于相位恢复由均衡器均衡的信号; 以及用于后置滤波由相位恢复装置相位恢复的信号的后置滤波器，并将全响应数字信号返回到部分响应数字信号。预滤波器的传递函数是部分响应传送信号的传递函数的近似反演。版权所有（C）2012，JPO＆INPIT

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