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1. 发明授权

US09369228B2 Method and apparatus for heterodyne coherent detection 有权
标题翻译：用于外差相干检测的方法和装置
公开(公告)号：US09369228B2
公开(公告)日：2016-06-14
申请号：US13966845
申请日：2013-08-14
申请人： ZTE (USA) INC.
发明人： Jianjun Yu , Ze Dong , Hung-Chang Chien
IPC分类号： H04B10/06 , H04J14/08 , H04J14/02 , H04J14/06 , H04B10/61 , H04B10/64
CPC分类号： H04J14/08 , H04B10/614 , H04B10/64 , H04J14/02 , H04J14/06
摘要： A simplified coherent receiver based on heterodyne detection with only two balanced photo detectors (PD) and two analog-to-digital converters (ADC) is disclosed. The polarization diversity hybrid can be simplified relative to the conventional one. The detected intermediate frequency signals are first down converted to baseband with I/Q separation.
摘要翻译：公开了一种基于仅使用两个平衡光电检测器（PD）和两个模拟 - 数字转换器（ADC）的外差检测的简化相干接收机。相对于传统的偏振分集混合可以简化。检测到的中频信号首先通过I / Q分离下变频到基带。

2. 发明申请

US20160087740A1 HALF-CYCLED ORTHOGONAL FREQUENCY DIVISIONAL MULTIPLEXING TRANSMISSION AND RECEPTION 有权
标题翻译：半循环正交频分复用传输和接收
公开(公告)号：US20160087740A1
公开(公告)日：2016-03-24
申请号：US14891598
申请日：2014-05-15
申请人： ZTE (USA) Inc.
发明人： Jianjun Yu , Fan Li
IPC分类号： H04J11/00 , H04J14/02
CPC分类号： H04J11/00 , H04B10/5563 , H04J14/0298 , H04L25/03343 , H04L25/03821 , H04L27/263 , H04L27/2643
摘要： An optical transmitter transmits an orthogonal frequency division multiplexing symbol in which only one-half of available subcarriers are modulated with data and the remaining subcarriers are suppressed by not modulating with data. The transmission is of duration equal to half the symbol period of the OFDM symbol, resulting in a half-cycle transmission. An optical receiver receives the half-cycle transmission OFDM symbol, regenerates the full time domain representation and recovers data modulated on the one-half of available subcarriers. The modulated subcarriers and the suppressed subcarriers alternate in the frequency domain.
摘要翻译：光发射机发送正交频分复用符号，其中只有一半的可用子载波被数据调制，并且通过不用数据调制来抑制剩余的副载波。传输的持续时间等于OFDM符号的符号周期的一半，导致半周期传输。光接收器接收半周期传输OFDM符号，再生全时间域表示并恢复在可用子载波的一半上调制的数据。调制子载波和被抑制的子载波在频域中交替。

3. 发明授权

US10305620B2 Method and apparatuses for algorithm on QAM coherent optical detection 有权
公开(公告)号：US10305620B2
公开(公告)日：2019-05-28
申请号：US14268739
申请日：2014-05-02
申请人： ZTE (USA) INC.
发明人： Jianjun Yu , Jin Tang
IPC分类号： H04L12/28 , H04J14/06 , H04B10/532 , H04B10/54 , H04L27/22 , H04L27/227 , H04L27/38
摘要： Blind polarization demultiplexing algorithms based on complex independent component analysis (ICA) by negentropy maximization for quadrature amplitude modulation (QAM) coherent optical systems are disclosed. The polarization demultiplexing is achieved by maximizing the signal's non-Gaussianity measured by the information theoretic quantity of negentropy. An adaptive gradient optimization algorithm and a Quasi-Newton algorithm with accelerated convergence are employed to maximize the negentropy. Certain approximate nonlinear functions can be substitutes for the negentropy which is strictly derived from the probability density function (PDF) of the received noisy QAM signal with phase noise, and this reduces the computational complexity. The numerical simulation and experimental results of polarization division multiplexing (PDM)-quadrature phase shift keying (QPSK) and PDM-16QAM reveal that the ICA demultiplexing algorithms are feasible and effective in coherent systems and the simplified ones can also achieve equivalent performance.

4. 发明授权

US09391731B2 Nyquist wavelength division multiplexing system 有权
标题翻译：奈奎斯特波分复用系统
公开(公告)号：US09391731B2
公开(公告)日：2016-07-12
申请号：US13778434
申请日：2013-02-27
申请人： ZTE (USA) Inc.
发明人： Zhensheng Jia , Jianjun Yu , Hung-Chang Chien
IPC分类号： H04B10/61 , H04B10/60 , H04J14/02 , H04J14/06
CPC分类号： H04J14/02 , H04J14/0254 , H04J14/06
摘要： Aspects of the present invention include apparatus and methods for transmitting and receiving signals in communication systems. A beam splitter splits an optical signal into a plurality of signals. At least one QPSK modulator generates a plurality of QPSK modulated signals from the plurality of signals. An optical multiplexer combines the plurality of QPSK modulated signals into a multiplexed signal. The multiplexed signal is then transmitted.
摘要翻译：本发明的方面包括在通信系统中发送和接收信号的装置和方法。分束器将光信号分离成多个信号。至少一个QPSK调制器从多个信号产生多个QPSK调制信号。光复用器将多个QPSK调制信号组合成复用信号。然后发送复用的信号。

5. 发明授权

US09356702B2 Flattened optical frequency-locked multi-carrier generation by one DML and one phase modulator 有权
标题翻译：通过一个DML和一个相位调制器进行平坦化的光锁相多载波生成
公开(公告)号：US09356702B2
公开(公告)日：2016-05-31
申请号：US14277884
申请日：2014-05-15
申请人： ZTE (USA) INC.
发明人： Jianjun Yu , Ze Dong
IPC分类号： H04B10/04 , H04B10/50
CPC分类号： H04B10/504 , H04B10/5051 , H04B10/506
摘要： The disclosure relates to a method for optical frequency-locked multi-carrier generation based on one directly-modulated laser (DML) and one phase modulator (PM) in cascade driven by sinusoidal waveform (at the same or different frequency). When the DML and PM is driven by the same frequency RF signal at 12.5 GHz, adopting this method, 16 optical subcarriers with 12.5-GHz frequency spacing are generated with power difference less than 3 dB. When the DML and PM is driven by the different frequency with DML at 12.5 Ghz and PM at 25 GHz, over 24 optical subcarriers are generated with 12.5-GHz frequency spacing and amplitude fluctuation less than 3 dB. The number of the generated optical subcarriers can be further increased when the driving power for the DML is increased.
摘要翻译：本公开涉及一种基于一个直接调制激光器（DML）和一个由正弦波形（相同或不同频率）驱动的级联的一个相位调制器（PM）的光锁频多载波生成方法。当DML和PM由12.5 GHz的相同频率的RF信号驱动时，采用这种方法，在功率差小于3 dB的情况下产生具有12.5 GHz频率间隔的16个光副载波。当DML和PM由不同频率驱动时，DML在12.5 Ghz和PM在25 GHz，超过24个光子载波产生12.5 GHz频率间隔和振幅波动小于3 dB。当DML的驱动功率增加时，可以进一步增加所产生的光子载波的数量。

6. 发明授权

US09270513B2 Method and apparatus for algorithm on flexible square-QAM coherent detection 有权
标题翻译：用于灵活平方QAM相干检测算法的方法和装置
公开(公告)号：US09270513B2
公开(公告)日：2016-02-23
申请号：US14165127
申请日：2014-01-27
申请人： ZTE (USA) INC.
发明人： Jianjun Yu , Bo Huang
IPC分类号： H03H7/30 , H04L27/38 , H04L25/03
CPC分类号： H04L27/3818 , H04L25/03038 , H04L2025/03617
摘要： In Software defined elastic optical networks, modulation format and constellation size may be flexibly modified. As a result, digital signal processing (DSP) algorithm should be compatible with different modulation schemes or readily reconfigurable at the optical coherent receiver. Therefore we propose a novel cascaded adaptive blind equalizers based on decision-directed modified least mean square (DD-MLMS) algorithm for polarization separation and carrier phase recovery. The algorithm is square quadrature amplitude modulation (QAM) independent so that it could be applied in the elastic optical systems. The 28 Gbaud polarization multiplexing quadrature phase shift keying (PM-QPSK) and PM-16QAM back-to-back transmission is demonstrated. The results show that the performance is very close to the general algorithm but with a benefit of the reduced operation complexity. We transmit the 8×240 Gb/s PM-16QAM wavelength division multiplexing (WDM) signal over 1200 km standard single mode fiber (SSMF) based on the proposed blind equalization with a bit error ratio (BER) less than 2×10−2.
摘要翻译：在软件定义的弹性光网络中，可以灵活地修改调制格式和星座大小。因此，数字信号处理（DSP）算法应该与不同的调制方案兼容，或者在光学相干接收机处可以容易地重新配置。因此，我们提出了一种基于用于偏振分离和载波相位恢复的决策导向修正最小均方（DD-MLMS）算法的新颖级联自适应盲均衡器。该算法是平方正交幅度调制（QAM）独立的，因此可以应用于弹性光学系统中。展示了28 Gbaud偏振复用正交相移键控（PM-QPSK）和PM-16QAM背对背传输。结果表明，性能非常接近于一般算法，但具有降低的操作复杂度的优点。我们基于提出的盲均衡，以比特误码率（BER）小于2×10-2的速度，在1200km标准单模光纤（SSMF）上传输8×240Gb / s的PM-16QAM波分复用（WDM）信号。

7. 发明授权

US09209908B2 System and method for heterodyne coherent detection with optimal offset 有权
标题翻译：用于具有最佳偏移量的外差相干检测的系统和方法
公开(公告)号：US09209908B2
公开(公告)日：2015-12-08
申请号：US14045992
申请日：2013-10-04
申请人： ZTE (USA) INC.
发明人： Jianjun Yu , Ze Dong , Hung-Chang Chien
IPC分类号： H04B10/06 , H04B10/61 , H04B10/64
CPC分类号： H04B10/614 , H04B10/64
摘要： A heterodyne optical signal detector and method performed thereby, the signal detector including an optical signal spectrum shaper operable to modify the shape of the frequency spectrum of a received optical signal, a laser local oscillator (LO), and polarization beam splitters (PBSs) to divide the signal and the LO into orthogonal components, waveguides in which intermediate frequency (IF) signals are formed, balanced photodetectors (BPDs) arranged to receive the IF signals and operable to convert the IF signals into electric signals, and analog to digital converters (ADCs) that digitize the electric signals. In embodiments, the ADCs have a predetermined bandwidth, the received signal has a spectrum which, if not shaped, would produce IF signals with a bandwidth greater than that of the ADCs, the spectrum shaper modifies the received signal spectrum to produce IF signals that have a bandwidth substantially equal to half the bandwidth of the ADCs, the laser frequency is adjusted produce IF signals in the waveguides having a frequency spectrum centered at the midpoint of the ADCs' bandwidth.
摘要翻译：一种外差光信号检测器和由此执行的方法，所述信号检测器包括可操作以修改所接收的光信号的频谱的形状的光信号频谱整形器，激光本地振荡器（LO）和偏振分束器（PBS）至将信号和LO分成正交分量，其中形成中频（IF）信号的波导，布置成接收IF信号并可操作以将IF信号转换成电信号的平衡光电检测器（BPD）和模数转换器 ADC），数字化电信号。在实施例中，ADC具有预定带宽，所接收的信号具有频谱，如果不成形，将产生带宽大于ADC的带宽的IF信号，频谱整形器修改接收信号频谱以产生具有带宽基本上等于ADC的一半带宽，激光频率被调整，在具有以ADC的带宽中点为中心的频谱的波导中产生IF信号。

8. 发明授权

US08934780B2 Direct detection of optical orthogonal frequency division multiplexing (OFDM) signals 有权
标题翻译：直接检测光正交频分复用（OFDM）信号
公开(公告)号：US08934780B2
公开(公告)日：2015-01-13
申请号：US13710428
申请日：2012-12-10
申请人： ZTE (USA) Inc.
发明人： Jianjun Yu
IPC分类号： H04B10/00 , H04J14/06 , H04J11/00 , H04J14/00 , H04L27/26
CPC分类号： H04J11/00 , H04J14/00 , H04L27/2613 , H04L27/2662 , H04L27/2692 , H04L27/2697
摘要： Techniques for timing synchronization in an optical orthogonal frequency division multiplexing (OOFDM) system includes providing a time-domain training symbol having a symmetric distribution and producing the training symbol by transmitting a real-valued PN sequence on each subcarrier under the OOFDM. The training sequence includes an initial value, followed by an odd length palindromic sequence of values.
摘要翻译：在光学正交频分复用（OOFDM）系统中的定时同步技术包括提供具有对称分布的时域训练符号并通过在OOFDM下的每个子载波上传送实值PN序列来产生训练符号。训练序列包括初始值，后跟奇数长度的回文序列值。

9. 发明申请

US20140369398A1 DIGITAL FILTER, PARTIAL RESPONSE EQUALIZER, AND DIGITAL COHERENT RECEIVER DEVICE AND METHOD 审中-公开
标题翻译：数字滤波器，部分响应均衡器和数字相关接收器件及方法
公开(公告)号：US20140369398A1
公开(公告)日：2014-12-18
申请号：US14369886
申请日：2012-12-19
申请人： ZTE (USA) Inc.
发明人： Jianjun Yu , Jianqiang Li
IPC分类号： H04L25/03 , H04L27/38
CPC分类号： H04L25/03012 , H04L25/03178 , H04L27/38 , H04L27/3818
摘要： Aspects of the present invention include devices and methods for receiving signals in communication systems. A partial response equalizer includes a full response linear equalizing device for equalizing a received signal; and a partial response post filter for post filtering the equalized signal. Aspects of the present invention devices and methods for coherently receiving signals in an optical communication system. A receiver front end converts a received partial response optical signal to a partial response digital signal. An equalizing device equalizes the pre-filtered full response digital signal. A full response carrier recovery device performs carrier recovery of the signal equalized by the equalizing device. A post-filter filters the signal having undergone carrier recovery by the full response carrier recovery device.
摘要翻译：本发明的方面包括用于在通信系统中接收信号的装置和方法。部分响应均衡器包括用于均衡接收信号的全响应线性均衡装置; 以及用于后置滤波均衡信号的部分响应后置滤波器。在光通信系统中相干接收信号的本发明装置和方法的方面。接收器前端将接收到的部分响应光信号转换为部分响应数字信号。均衡装置使预过滤的全响应数字信号相等。全响应载波恢复装置执行由均衡装置均衡的信号的载波恢复。后置滤波器对由全响应载波恢复装置进行载波恢复的信号进行滤波。

10. 发明申请

US20130330070A1 METHODS AND APPARATUS FOR PRE AND POST EQUALIZATION IN OPTICAL COMMUNICATIONS SYSTEMS 有权
标题翻译：光通信系统中前置和后置均衡的方法和装置
公开(公告)号：US20130330070A1
公开(公告)日：2013-12-12
申请号：US13912138
申请日：2013-06-06
申请人： ZTE (USA) INC.
发明人： Jianjun Yu
IPC分类号： H04B10/077
CPC分类号： H04B10/0775 , H04B10/073 , H04B10/2507 , H04B10/5053 , H04B10/506 , H04B10/541 , H04B2210/254
摘要： An optical communication system includes a transmission apparatus that transmits a test signal over an optical communication medium using a first optical modulation format, receives a reception report for the test signal, determines, based on the received reception report, a pre-equalization scheme, applies the pre-equalization to data transmitted from the transmitter side to generate pre-equalized data and transmits the pre-equalized data using a second optical modulation format based on the reception report. An optical reception apparatus receives the test signal, computes a channel transfer function based on the received test signal, and transmits the reception report.
摘要翻译：光通信系统包括：通过光通信介质使用第一光调制格式发送测试信号的发送装置，接收测试信号的接收报告，根据接收到的接收报告确定预均衡方案，应用从发射机侧发送的数据的预均衡到生成预均衡数据，并且使用基于接收报告的第二光调制格式发送预均衡数据。光接收装置接收测试信号，根据接收到的测试信号计算信道传递函数，发送接收报告。

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