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1.发明授权公开(公告)号：US09520950B2
公开(公告)日：2016-12-13
申请号：US12330691
申请日：2008-12-09
申请人： James Harley , Kim Roberts , Chuandong Li
发明人： James Harley , Kim Roberts , Chuandong Li
IPC分类号： H04B10/00 , H04B10/532 , H04B10/2513 , H04B10/69
CPC分类号： H04B10/532 , H04B10/25137 , H04B10/6972 , H04B2210/252 , H04B2210/254
摘要： Described are an optical communications system and a method that allow for compensation of chromatic dispersion and polarization mode dispersion imparted to a communications signal propagating through an optical link. The system is based on a cost-effective optical transport architecture that accommodates baud rates exceeding 15 Gbaud and eliminates the need for costly optical dispersion compensators. Compensation for polarization mode dispersion is performed at the receiver using nonlinear processing. Advantageously, direct detection modulation using inexpensive electro-optic system components can be used in place of more costly and complex coherent and differential modulation formats. Digital filtering can be performed at the transmitter and the input signal can be inverted based on the nonlinearity of the transmitter electro-optic components. Consequently, the bandwidth and linearity requirements for the transmitter electro-optic components are relaxed, and cost reductions are realized.
摘要翻译： 描述了允许补偿通过光链路传播的通信信号的色散和偏振模色散的光通信系统和方法。 该系统基于具有成本效益的光学传输架构，其适应波特率超过15Gbaud，并且不需要昂贵的光学色散补偿器。 使用非线性处理在接收机处执行偏振模色散的补偿。 有利地，可以使用廉价的电光系统组件的直接检测调制来代替更昂贵和复杂的相干和差分调制格式。 可以在发射机处执行数字滤波，并且可以基于发射机电光部件的非线性来反转输入信号。 因此，放大了发射机电光元件的带宽和线性要求，并实现成本降低。
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2.发明申请公开(公告)号：US20090304391A1
公开(公告)日：2009-12-10
申请号：US12330691
申请日：2008-12-09
申请人： James Harley , Kim Roberts , Chuandong Li
发明人： James Harley , Kim Roberts , Chuandong Li
IPC分类号： H04B10/12
CPC分类号： H04B10/532 , H04B10/25137 , H04B10/6972 , H04B2210/252 , H04B2210/254
摘要： Described are an optical communications system and a method that allow for compensation of chromatic dispersion and polarization mode dispersion imparted to a communications signal propagating through an optical link. The system is based on a cost-effective optical transport architecture that accommodates baud rates exceeding 15 Gbaud and eliminates the need for costly optical dispersion compensators. Compensation for polarization mode dispersion is performed at the receiver using nonlinear processing. Advantageously, direct detection modulation using inexpensive electro-optic system components can be used in place of more costly and complex coherent and differential modulation formats. Digital filtering can be performed at the transmitter and the input signal can be inverted based on the nonlinearity of the transmitter electro-optic components. Consequently, the bandwidth and linearity requirements for the transmitter electro-optic components are relaxed, and cost reductions are realized.
摘要翻译： 描述了允许对通过光链路传播的通信信号赋予色散和偏振模色散的补偿的光通信系统和方法。 该系统基于具有成本效益的光学传输架构，其适应波特率超过15Gbaud，并且不需要昂贵的光学色散补偿器。 使用非线性处理在接收机处执行偏振模色散的补偿。 有利地，可以使用廉价的电光系统组件的直接检测调制来代替更昂贵和复杂的相干和差分调制格式。 可以在发射机处执行数字滤波，并且可以基于发射机电光部件的非线性来反转输入信号。 因此，放大了发射机电光元件的带宽和线性要求，并实现成本降低。
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3.发明授权公开(公告)号：US08180228B1
公开(公告)日：2012-05-15
申请号：US12273597
申请日：2008-11-19
申请人： James Harley , Chuandong Li
发明人： James Harley , Chuandong Li
IPC分类号： H04B10/06
CPC分类号： H04B10/697 , H04L7/0004 , H04L7/0062 , H04L25/03178 , H04L25/03292 , H04L27/02
摘要： In a direct-detection receiver having an analog-to-digital converter (ADC) for sampling a received optical signal and a sequence estimator for recovering data symbols from a multi-bit sample stream generated by the ADC, a method of acquiring a channel lock condition of a clock recovery block of the receiver. A plurality of sets of channel statistics are provided. Each set of channel statistics optimizes performance of the sequence estimator for a respective predetermined combination of channel chromatic dispersion and polarization mode dispersion. At least one set of channel statistics will, when installed in the sequence estimator, yield symbol estimates having residual distortions that are within an acquisition range of the clock recovery block. During start-up of the receiver, one of the sets of channel statistics is selected and installed in the Sequence Estimator. If a channel lock condition is not detected within a predetermined time interval, the step of selecting one of the sets of channel statistics and installing the selected set of channel statistics in the Sequence Estimator is repeated until a channel lock condition is detected.
摘要翻译： 在具有用于对接收到的光信号进行采样的模数转换器（ADC）的直接检测接收机和用于从由ADC产生的多位采样流中恢复数据符号的序列估计器的方法中，获取通道锁 接收机的时钟恢复块的状态。 提供多组信道统计。 每组信道统计优化针对信道色散和偏振模色散的相应预定组合的序列估计器的性能。 当安装在序列估计器中时，至少一组信道统计将产生具有在时钟恢复块的采集范围内的残余失真的符号估计。 在接收机启动过程中，选择频道统计信息之一并将其安装在序列估计器中。 如果在预定时间间隔内没有检测到通道锁定条件，则重复在序列估计器中选择信道统计信息集合和安装所选择的一组信道统计信息的步骤，直到检测到信道锁定状态。
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公开(公告)号：US11451329B2
公开(公告)日：2022-09-20
申请号：US17157691
申请日：2021-01-25
申请人： Jianhong Ke , Chuandong Li , Xuefeng Tang
发明人： Jianhong Ke , Chuandong Li , Xuefeng Tang
IPC分类号： H04L1/00
摘要： Methods and systems for performing signal pre-correction of a transmission signal comprising a sequence of symbols using a Pattern Dependent Look-up Table (PDLUT) containing one or more distortion correction values. Upon accessing a distortion correction value from the PDLUT for a symbol of the sequence of symbols, the accessed distortion correction value is quantized into one or more quantized values according to one or more quantizations, thereby reducing the bit-width of the distortion correction value. The transmission signal and the distortion correction value with reduced bit-width may undergo linear correction compensation, such as through a finite impulse response (FIR) filter, independent of one another, where the one or more quantized correction values with reduced bit-width reduce a number of calculation steps performed during linear correction compensation resulting in power savings. The linearly compensated quantized values and the linearly compensated signal are combined to form a pre-corrected signal.
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5.发明授权公开(公告)号：US11108599B1
公开(公告)日：2021-08-31
申请号：US16936098
申请日：2020-07-22
申请人： Chuandong Li , Jianhong Ke
发明人： Chuandong Li , Jianhong Ke
摘要： Methods and devices are described for frequency domain equalization with low complexity and loop delay. A transmitter inserts pilot symbols into a data signal at intervals of every n data bits. These pilot symbols are used by a receiver-side frequency-domain equalizer to calculate error levels and equalize the received data signal to effect impairment compensation such as SOP tracking. QPSK or BPSK symbols may be used for the pilot symbols, simplifying error calculation into an addition operation instead of the conventional multiplication operation required by conventional FDEQs. Equalizers are described that may operate in a pilot-assisted mode, a conventional decision-directed mode, or both.
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公开(公告)号：US11038598B1
公开(公告)日：2021-06-15
申请号：US16801608
申请日：2020-02-26
申请人： Jianhong Ke , Chuandong Li
发明人： Jianhong Ke , Chuandong Li
摘要： Aspects of the present application provide methods and devices for compensating crosstalk in in the digital domain, the crosstalk occurring in the analog domain, for an optical coherent transceiver on a photonic integrated circuit (PIC).
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公开(公告)号：US20190182082A1
公开(公告)日：2019-06-13
申请号：US15838499
申请日：2017-12-12
摘要： An apparatus in a signal receiver, such as an optical signal receiver, is provided. An adaptive equalizer provides an equalized output indicative of a received signal. A feedback component receives the equalized output and provides feedback to the adaptive equalizer. A carrier recovery component receives the equalized output from the adaptive equalizer provides estimates of symbols. The carrier recovery component is partially or fully disjoint from the feedback component, thus removing the carrier recovery component from equalizer the feedback loop. The feedback component can include an initial carrier recovery component and a phase rotation and detection component. The initial carrier recovery component generates a carrier recovery output based on the equalized output. The phase rotation and detection component performs a phase rotation based on the carrier recovery output.
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公开(公告)号：US09929805B2
公开(公告)日：2018-03-27
申请号：US15151895
申请日：2016-05-11
申请人： Zhiping Jiang , Zhuhong Zhang , Chuandong Li
发明人： Zhiping Jiang , Zhuhong Zhang , Chuandong Li
IPC分类号： H04J14/02 , H04B10/11 , H04L5/00 , H04B1/00 , H04B10/556
CPC分类号： H04B10/11 , H04B1/0007 , H04B10/50 , H04B10/5563 , H04B2210/075 , H04J14/02 , H04J14/0276 , H04L5/0048 , H04L25/0226
摘要： The disclosure is directed to a method and system for generating a pilot tone for an optical signal with an optical telecommunications system. The pilot tone is generated in the digital domain by modulating the data to be transmitted to a destination node within the optical telecommunications network. The modulation of the data introduces occurrence modulation to the optical signal.
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公开(公告)号：US09755864B1
公开(公告)日：2017-09-05
申请号：US15228592
申请日：2016-08-04
IPC分类号： H04L25/03
CPC分类号： H04L25/03949 , H04L25/03063 , H04L25/03885
摘要： An apparatus for performing fractionally spaced adaptive equalization with non-integer sub-symbol sampling has an adaptive equalizer that receives a continuous stream of input data having a non-integer, fractional delay between consecutive samples at a non-integer, sub-symbol rate and outputs a stream of equalized data based on tap weights of taps of the adaptive equalizer that are spaced at an interval corresponding to the non-integer, sub-symbol rate. The tap weights are updated independently of the fractional delay between consecutive samples of the input data using an error signal. An equalizer output alignment component downstream of the adaptive equalizer aligns the stream of equalized data with a corresponding transmitted symbol.
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10.发明授权公开(公告)号：US09602151B1
公开(公告)日：2017-03-21
申请号：US14840457
申请日：2015-08-31
申请人： Mahdi Zamani , Ahikam Aharony , Zhuhong Zhang , Chuandong Li , Weikun Hou
发明人： Mahdi Zamani , Ahikam Aharony , Zhuhong Zhang , Chuandong Li , Weikun Hou
CPC分类号： H04B1/40 , H04L27/0014 , H04L27/32
摘要： Provided is an apparatus and method for transmitting and receiving wireless signals. A transmitting apparatus has a signal processor and a transmitter. The signal processor is configured to generate a signal having a middle channel and at least one side channel. The transmitter is configured to wirelessly transmit the signal subject to a spectral mask that has shoulder regions. According to an embodiment of the invention, the signal processor generates the signal such that each side channel is positioned in one of the shoulder regions of the spectral mask. In this manner, bandwidth from the shoulder regions can be utilized by one or more side channels. Also provided is a receiving apparatus having a receiver configured to wirelessly receive the signal, and a signal processor configured to process the signal.
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