公开(公告)号：US08358936B2

公开(公告)日：2013-01-22

申请号：US12562251

申请日：2009-09-18

Applicant: Jianjun Yu ,  Lei Xu ,  Dayou Qian ,  Ting Wang

Inventor： Jianjun Yu ,  Lei Xu ,  Dayou Qian ,  Ting Wang

IPC: H04B10/04 ,  H04B10/12

CPC classification number: H04B10/50

Abstract: An optical apparatus includes a quadrature phase shift keying modulator for generating a non-return-to-zero quadrature phase shift keyed NRZ-QPSK signal from a received lightwave, the modulator being driven by a radio frequency RF signal, an intensity modulator for carving the NRZ-QPSK signal to return-to-zero RZ pulses with a different duty cycle than that of the NRZ-QPSK, the intensity modulator being driven by a radio frequency RF clock signal to change the NRZ-QPSK to an RZ-QPSK signal, and an optical filter with a narrow band for filtering the signal from the intensity modulator to increase optical power that is useable by an optical digital coherent detection system.

Abstract translation: 光学装置包括：正交相移键控调制器，用于从接收到的光波产生不归零正交相移键控的NRZ-QPSK信号，调制器由射频RF信号驱动;强度调制器，用于雕刻 NRZ-QPSK信号以与NRZ-QPSK的占空比不同的占空比的归零RZ脉冲，强度调制器由射频RF时钟信号驱动，以将NRZ-QPSK改变为RZ-QPSK信号， 以及具有窄带的滤光器，用于对来自强度调制器的信号进行滤波，以增加可由光学数字相干检测系统使用的光功率。

公开(公告)号：US20120321303A1

公开(公告)日：2012-12-20

申请号：US13523103

申请日：2012-06-14

Applicant: Shaoliang Zhang ,  Fatih Yaman ,  Lei Xu ,  Ting Wang ,  Yoshihisa Inada ,  Takaaki Ogata ,  Yasuhiro Aoki

Inventor： Shaoliang Zhang ,  Fatih Yaman ,  Lei Xu ,  Ting Wang ,  Yoshihisa Inada ,  Takaaki Ogata ,  Yasuhiro Aoki

IPC: H04Q11/00

CPC classification number: H04Q11/00 ,  H04B10/532 ,  H04B10/5561 ,  H04L27/2075 ,  H04L27/2096 ,  H04L27/223 ,  H04Q2213/1301

Abstract: An inventive method for multi-symbol polarization switching for differential detection optical systems includes modulating a laser source by a DQPSK modulator, driving the DQPSK modulator with a data block configured for generating multi-symbol polarization-switched DQPSK differential-encoded signals, and polarizing the multi-symbol polarization-switched DQPSK signals with a polarizing modulator whose modulation speed is based on how often polarization states vary, wherein the data block provides a bits manipulation to provide the multi-symbol polarization switching thereby enabling differential detection for recovering correct original data by a receiver.

Abstract translation: 用于差分检测光学系统的多符号偏振切换的创新方法包括通过DQPSK调制器调制激光源，用配置用于产生多符号偏振切换DQPSK差分编码信号的数据块驱动DQPSK调制器， 具有偏振调制器的多符号偏振切换DQPSK信号，其调制速度基于偏振态变化的频率，其中数据块提供比特操作以提供多符号偏振切换，从而使差分检测能够通过以下方式恢复正确的原始数据： 接收器

公开(公告)号：US20120263468A1

公开(公告)日：2012-10-18

申请号：US13446370

申请日：2012-04-13

Applicant: Fatih Yaman ,  Shaoliang Zhang ,  Lei Xu ,  Yin Shao ,  Ting Wang

Inventor： Fatih Yaman ,  Shaoliang Zhang ,  Lei Xu ,  Yin Shao ,  Ting Wang

IPC: H04B10/04 ,  H04J14/02 ,  H04J14/06

CPC classification number: H04B10/5167 ,  H04B10/5561 ,  H04L27/2096

Abstract: An optical method for generating an optical quadrature duobinary QDB signal includes receiving a quadrature phase-shift-keying QPSK signal, and adding a delay to the received quadrature phase-shift-keying QPSK signal to generate an optical quadrature duobinary signal.

Abstract translation: 用于产生光学正交双二进制QDB信号的光学方法包括：接收正交相移键控QPSK信号，并将相加的延迟加到接收的正交相移键控QPSK信号上以产生光学正交二进制信号。

公开(公告)号：US20120263251A1

公开(公告)日：2012-10-18

申请号：US13270211

申请日：2011-10-10

Applicant: Ivan B. Djordjevic ,  Lei Xu ,  Ting Wang

Inventor： Ivan B. Djordjevic ,  Lei Xu ,  Ting Wang

IPC: H04L23/02 ,  H04L27/28

CPC classification number: H04L1/0057 ,  H04L1/0042 ,  H04L5/0016 ,  H04L5/04 ,  H04L25/067 ,  H04L27/2628 ,  H04L27/3427

Abstract: A coded multidimensional modulation system called generalized OFDM (GOFDM) uses orthogonal subcarriers as bases functions, and the signal constellation points of corresponding multidimensional constellation diagram are obtained as N-dimensional Cartesian product of one-dimensional PAM/two-dimensional QAM. In GOFDM, the N-dimensional/2N-dimensional signal constellation point is transmitted over all N subcarriers/2N-subcarriers, which serve as individual bases functions. Even if some of the subcarriers are severely affected by channel distortion, the overall signal constellation point will face only small distortion, when strong channel capacity achieving channel codes are used. In addition, because the channel capacity is a linear function of number of dimensions, the spectral efficiency of optical transmission systems is significantly improved. Finally, since Euclidean distance of multidimensional signal constellation is much larger that that of two-dimensional signal constellations, OSNR sensitivity is dramatically improved.

Abstract translation: 称为广义OFDM（GOFDM）的编码多维调制系统使用正交子载波作为基本功能，并且获得相应多维星座图的信号星座点作为一维PAM /二维QAM的N维笛卡尔乘积。 在GOFDM中，N维/ 2N维信号星座点在用作各个基本功能的所有N个子载波/ 2N个子载波上发送。 即使某些子载波受到信道失真的严重影响，当使用实现信道码的强信道容量时，整个信号星座点也只会面临小的失真。 另外，由于信道容量是维数的线性函数，所以光传输系统的频谱效率显着提高。 最后，由于多维信号星座的欧几里德距离远大于二维信号星座的距离，因此OSNR灵敏度得到显着提高。

公开(公告)号：US20120251028A1

公开(公告)日：2012-10-04

申请号：US13435775

申请日：2012-03-30

Applicant: Fatih Yaman ,  Shaoliang Zhang ,  Lei Xu ,  Ting Wang ,  Yoshihisa Inada ,  Takaaki Ogata ,  Yasuhiro Aoki

Inventor： Fatih Yaman ,  Shaoliang Zhang ,  Lei Xu ,  Ting Wang ,  Yoshihisa Inada ,  Takaaki Ogata ,  Yasuhiro Aoki

IPC: G02F1/01

CPC classification number: G02F1/01 ,  H04B10/5162 ,  H04B10/5165 ,  H04B10/532

Abstract: A method for optical chirp-free optical polarization modulation includes dividing a data modulated optical signal into a first optical path and a second optical path, using a Mach-Zehnder intensity modulator in the first optical path for imparting a π phase difference between adjacent symbols of the data modulated optical signal in the first optical path, adjusting a delay and amplitude of symbols of the data modulated optical signal in the second path so that the symbols in the first path and the symbols in the second path are synchronized and have substantially equal power levels, and combining the first and second optical paths so that symbols from the first and second optical paths are in orthogonal polarizations.

Abstract translation: 一种用于无啁啾光学偏振调制的方法包括：使用第一光路中的马赫 - 曾德尔强度调制器将数据调制光信号划分成第一光路和第二光路， 在第一光路中的数据调制光信号的相邻符号之间的相位差，调整第二路径中的数据调制光信号的符号的延迟和幅度，使得第一路径中的符号和第二路径中的符号为 同步并且具有基本上相等的功率电平，并且组合第一和第二光路，使得来自第一和第二光路的符号处于正交偏振。

公开(公告)号：US08233809B2

公开(公告)日：2012-07-31

申请号：US12607125

申请日：2009-10-28

Applicant: Dayou Qian ,  Ting Wang ,  Kai Yang ,  Junqiang Hu

Inventor： Dayou Qian ,  Ting Wang ,  Kai Yang ,  Junqiang Hu

IPC: H04B10/06

CPC classification number: H04J14/002 ,  H04B10/2513 ,  H04B10/60 ,  H04B10/6161 ,  H04B10/6162 ,  H04J14/06

Abstract: A method for the polarization independent frequency domain equalization (FDE) chromatic dispersion compensation on polarization multiplexing (POLMUX) coherent systems. Operationally, time domain signals are converted to frequency domain signals such that time domain convolution can be done as simple multiplications in the frequency domain. These frequency domain signals then converted back to time domain for subsequent use. The input signal size and FFT size are advantageously designed so that the output signals can be continuous with some overlap between two successive frames.

Abstract translation: 一种用于偏振复用（POLMUX）相干系统上的偏振独立频域均衡（FDE）色散补偿的方法。 在操作上，时域信号被转换成频域信号，使得时域卷积可以作为频域中的简单乘法来完成。 然后，这些频域信号被转换回到时域以供后续使用。 有利地设计输入信号尺寸和FFT尺寸，使得输出信号可以是连续的，在两个连续帧之间具有一些重叠。

公开(公告)号：US08219874B2

公开(公告)日：2012-07-10

申请号：US12535423

申请日：2009-08-04

Applicant: Ivan B. Djordjevic ,  Hussam G. Batshon ,  Lei Xu ,  Ting Wang

Inventor： Ivan B. Djordjevic ,  Hussam G. Batshon ,  Lei Xu ,  Ting Wang

IPC: H03M13/00 ,  G06F11/00

CPC classification number: H03M13/255 ,  H03M13/116 ,  H03M13/2703 ,  H03M13/6325 ,  H04L1/005 ,  H04L1/0057

Abstract: Arbitrarily high data transmission rates may be achieved by the use of N-dimensional, LDPC-coded modulation. N orthonormal basis functions are employed using coherent reception, resulting in a proportional increase in transmission rate with only a modest increase in bit-error ratio.

Abstract translation: 可以通过使用N维，LDPC编码的调制来实现任意高的数据传输速率。 使用相干接收使用N个正交基函数，导致传输速率的比例增加，而误码率仅有适度的增加。

公开(公告)号：US08184731B2

公开(公告)日：2012-05-22

申请号：US12372378

申请日：2009-02-17

Applicant: Dayou Qian ,  Jianjun Yu ,  Ting Wang

Inventor： Dayou Qian ,  Jianjun Yu ,  Ting Wang

IPC: H04L5/12

CPC classification number: H04L27/233

Abstract: A system and method to adjust the symbol constellation used to de-map a signal in an optical coherent communications system. A feedback de-mapper adjustment module is configured to compare average Error Vector Magnitude and Bit Error Ratio to a pre-defined table to determine when a constellation de-mapper mismatch occurs. The feedback de-mapper adjustment module then rotates the de-mapper constellation in order to compensate for phase drift.

Abstract translation: 一种用于调整用于在光学相干通信系统中去映射信号的符号星座的系统和方法。 反馈解映射器调整模块被配置为将平均误差矢量幅度和误码率与预定义的表进行比较，以确定何时发生星座解映射器失配。 反馈解映射器调整模块随后旋转去映射器星座以便补偿相位漂移。

公开(公告)号：US20120106983A1

公开(公告)日：2012-05-03

申请号：US12938738

申请日：2010-11-03

Applicant: Lei Xu ,  Shaoling Zhang ,  Ting Wang

Inventor： Lei Xu ,  Shaoling Zhang ,  Ting Wang

IPC: H04B10/06 ,  H03D1/06

CPC classification number: H04L27/223 ,  H04L1/0045 ,  H04L1/0057 ,  H04L27/2275 ,  H04L27/3836 ,  H04L2027/0055 ,  H04L2027/0067

Abstract: Methods and systems for normalized least mean square phase estimation are shown that include receiving optical transmissions that include a modulated signal, determining a step size based on a signal-to-noise ratio (SNR) and a laser linewidth that provides a balance between convergence speed and precision, estimating phase error using the determined step size, derotating the modulated signal to remove the estimated phase error, and demodulating the derotated signal to produce a bitstream.

Abstract translation: 示出了用于归一化的最小均方相位估计的方法和系统，其包括接收包括调制信号的光传输，基于信噪比（SNR）确定步长，以及提供收敛速度之间的平衡的激光线宽 和精确度，使用所确定的步长估计相位误差，解调调制信号以去除估计的相位误差，以及解调解旋信号以产生比特流。

公开(公告)号：US20120082457A1

公开(公告)日：2012-04-05

申请号：US12894742

申请日：2010-09-30

Applicant: Kai Yang ,  Junqiang Hu ,  Ting Wang

Inventor： Kai Yang ,  Junqiang Hu ,  Ting Wang

IPC: H04J14/06

CPC classification number: H04B10/616

Abstract: A method for clustered polyphase filtering input data converted from an optical signal converting input data from a serial form into a parallel form, permutating data symbols from the input data to form K clusters, passing the permutated data to an adder and multiplier for each cluster; and adding output of all K multipliers together to form an output.

Abstract translation: 一种用于将从串行形式的输入数据转换成并行形式的光信号转换的聚簇多相滤波输入数据的方法，从输入数据排列数据符号以形成K个簇，将排列数据传递给每个簇的加法器和乘法器; 并将所有K个乘法器的输出相加在一起以形成输出。