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1. 发明申请

US20220368512A1 SELF-CALIBRATING DEVICE AND METHOD FOR IN-PHASE AND QUADRATURE TIME SKEW AND CONJUGATION IN A COHERENT TRANSMITTER 有权
公开(公告)号：US20220368512A1
公开(公告)日：2022-11-17
申请号：US17869350
申请日：2022-07-20
申请人： Xuefeng TANG , Qiang JIN , Wing Chau NG , Si OUYANG , Zhuhong ZHANG
发明人： Xuefeng TANG , Qiang JIN , Wing Chau NG , Si OUYANG , Zhuhong ZHANG
IPC分类号： H04L7/00 , H04B10/516
摘要： Methods and devices for IQ time skew and conjugation compensation and calibration of a coherent transmitter or transceiver are described. A pilot tone is combined with a digital data signal such that relative powers of the pilot tone in each of two frequency bands of the transmitted data signal may be detected by a pilot tone detector and used to calculate the time skew between I and Q modulation channels of the transmitter. A transmitter DSP applies IQ time skew bias to the data signal to compensate for any calculated IQ time skew. The pilot tone detector also provides the transmitter DSP with the information necessary to detect phase conjugation of the optical signal, which can be corrected by inverting the polarity of the data signal or changing the phase bias point of the optical modulator.

2. 发明授权

US11451329B2 Method and apparatus of low-complexity pattern dependent lookup table pre-compensation 有权
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.

3. 发明申请

US20220239407A1 METHOD AND APPARATUS OF LOW-COMPLEXITY PATTERN DEPENDENT LOOKUP TABLE PRE-COMPENSATION 有权
公开(公告)号：US20220239407A1
公开(公告)日：2022-07-28
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.

4. 发明授权

US11381444B2 Method and apparatus for coherent transmitter calibration 有权
公开(公告)号：US11381444B2
公开(公告)日：2022-07-05
申请号：US17037840
申请日：2020-09-30
申请人： Wing Chau Ng , Xuefeng Tang , Zhuhong Zhang
发明人： Wing Chau Ng , Xuefeng Tang , Zhuhong Zhang
IPC分类号： H04B10/50 , H04B10/077 , H04L27/36 , H04L27/227 , H04L27/04
摘要： Methods and apparatus for coherent transmitter calibration are provided that employ direct detection (DD) using one single photodetector (PD). The provided method and apparatus do not require hardware for coherent reception, or additional ADCs for quality control. An additional optical tone is added to a QAM optical signal that is outside the band of the QAM optical signal. The result of this is that after direct detection, there is a correlation between the real and imaginary parts, and the imaginary part can be recovered with a Hilbert transform. The estimated QAM optical signal obtained by direct detection is used to perform a transmitter factory calibration method to calibrate for one or more transmitter impairments and/or to perform in-line self-calibration.

5. 发明申请

US20220021463A1 DEVICE AND METHOD FOR REAL-TIME CALIBRATION AND COMPENSATION FOR TRANSMITTER POWER IMBALANCE IN A COHERENT TRANSCEIVER 有权
公开(公告)号：US20220021463A1
公开(公告)日：2022-01-20
申请号：US16929962
申请日：2020-07-15
申请人： Xuefeng TANG , Wing Chau NG , Zhiping JIANG , Zhuhong ZHANG
发明人： Xuefeng TANG , Wing Chau NG , Zhiping JIANG , Zhuhong ZHANG
IPC分类号： H04B10/564 , H04B10/548 , G02F1/21
摘要： Methods and devices for power imbalance compensation and calibration of a coherent transmitter or transceiver are described. A pilot tone is combined with a digital data signal such that relative amplitudes of the pilot tone in each of four transmitted optical data channels may be detected by a pilot tone detector and used to calculate any power imbalances between I/Q phase channels and/or X/Y polarized channels of the transmitter. The pilot tone detector applies gain to the data signal of the transmitter to compensate for any calculated power imbalances. Because the pilot tone is combined with the digital data signal, its amplitude in each received channel is proportional to the data signal power of that channel.

6. 发明授权

US11153012B1 Systems and methods in an optical network 有权
公开(公告)号：US11153012B1
公开(公告)日：2021-10-19
申请号：US17000068
申请日：2020-08-21
申请人： Zhiping Jiang , Xuefeng Tang , Junho Chang
发明人： Zhiping Jiang , Xuefeng Tang , Junho Chang
IPC分类号： H04B10/04 , H04B10/516 , H04B10/50
摘要： Optical transmitters, receivers, and methods are described in an optical network. An optical transmitter comprises an encoder configured to receive an input data stream and to encode the input data stream into a signal. The signal is defined as a sequence of regular units, and a rotator is configured to receive each unit of the signal and to output, for each given input unit with an input state of polarization (SOP), a respective given output unit associated with an output SOP. The output SOP of the given output unit is different from a corresponding output SOP of each other output unit that is immediately adjacent to the given output unit. The output SOPs of the units in a transmitted signal may form an alternating pattern (or other repeating pattern), which may help to lower the average BER, in particular, due to forward error correction (FEC).

7. 发明申请

US20130146270A1 FIXING DEVICE, AND HEAT SINK DEVICE OR SHIELD CASE COMPRISING THE SAME 审中-公开
标题翻译：固定装置，以及包含该装置的散热装置或屏蔽壳
公开(公告)号：US20130146270A1
公开(公告)日：2013-06-13
申请号：US13488606
申请日：2012-06-05
申请人： Ping An , Xuefeng Tang , Su Cui
发明人： Ping An , Xuefeng Tang , Su Cui
IPC分类号： F28F7/00 , H05K7/20
CPC分类号： G06F1/203 , H01L23/4093 , H01L2924/0002 , H05K9/0028 , H01L2924/00
摘要： A fixing device, and a heat sink device or a shield case comprising the same. The fixing device is used to connect the heat sink device or the shield case to a circuit board. The circuit board has a via hole which comprises a first size, a second size, and a first height. The fixing device has a connecting member which comprises successively along its extending direction a first boss part, a clamping part, and a second boss part. The first boss part has a first width; the clamping part engages with the via hole, and has a second width and a second height; the second boss part has a third width. The third width is smaller than the second size, the second width equals to the first size, the second height equals to the first height, and the first and third width are larger than the first size.
摘要翻译：固定装置和散热装置或包括该固定装置的屏蔽壳。定影装置用于将散热装置或屏蔽罩连接到电路板。电路板具有包括第一尺寸，第二尺寸和第一高度的通孔。定影装置具有连续构件，该连接构件沿其延伸方向依次包括第一凸台部，夹紧部和第二凸台部。第一个凸起部分具有第一个宽度; 所述夹紧部与所述通孔接合，并具有第二宽度和第二高度; 第二凸台部分具有第三宽度。第三宽度小于第二尺寸，第二宽度等于第一尺寸，第二高度等于第一高度，第一宽度和第三宽度大于第一尺寸。

8. 发明申请

US20210119850A1 METHOD AND APPARATUS FOR COHERENT TRANSMITTER CALIBRATION 有权
公开(公告)号：US20210119850A1
公开(公告)日：2021-04-22
申请号：US17037840
申请日：2020-09-30
申请人： WING CHAU NG , XUEFENG TANG , ZHUHONG ZHANG
发明人： WING CHAU NG , XUEFENG TANG , ZHUHONG ZHANG
IPC分类号： H04L27/36 , H04L27/227 , H04L27/04 , H04B10/50 , H04B10/077
摘要： Methods and apparatus for coherent transmitter calibration are provided that employ direct detection (DD) using one single photodetector (PD). The provided method and apparatus do not require hardware for coherent reception, or additional ADCs for quality control. An additional optical tone is added to a QAM optical signal that is outside the band of the QAM optical signal. The result of this is that after direct detection, there is a correlation between the real and imaginary parts, and the imaginary part can be recovered with a Hilbert transform. The estimated QAM optical signal obtained by direct detection is used to perform a transmitter factory calibration method to calibrate for one or more transmitter impairments and/or to perform in-line self-calibration.

9. 发明授权

US09473263B2 Method and system for removing a pilot tone from an optical signal 有权
标题翻译：从光信号中去除导频音的方法和系统
公开(公告)号：US09473263B2
公开(公告)日：2016-10-18
申请号：US14598581
申请日：2015-01-16
申请人： Zhiping Jiang , Zhuhong Zhang , Xuefeng Tang
发明人： Zhiping Jiang , Zhuhong Zhang , Xuefeng Tang
IPC分类号： H04B10/00 , H04J14/02 , H04B10/077
CPC分类号： H04J14/0276 , H04B10/077 , H04B10/0775 , H04B10/2504 , H04B10/516 , H04B2210/075 , H04J14/06
摘要： The present applies to digital wavelength converters that convert, independently of the format in which optical data may be encoded, an input waveform at a first wavelength to an output waveform at a second wavelength. When operating in an environment where an input waveform has a pilot tone associated thereto, the method and system of the present disclosure allows for the removal of the pilot tone from the input waveform, and also allows for the addition of another pilot to the output waveform.
摘要翻译：本发明适用于与光学数据可被编码的格式独立地将第一波长的输入波形转换为第二波长的输出波形的数字波长转换器。当在输入波形具有与其相关联的导频音的环境中操作时，本公开的方法和系统允许从输入波形中去除导频音，并且还允许将另外的导频添加到输出波形。

10. 发明申请

US20160211938A1 METHOD AND SYSTEM FOR REMOVING A PILOT TONE FROM AN OPTICAL SIGNAL 有权
标题翻译：从光信号中移除引导音的方法和系统
公开(公告)号：US20160211938A1
公开(公告)日：2016-07-21
申请号：US14598581
申请日：2015-01-16
申请人： Zhiping JIANG , Zhuhong ZHANG , Xuefeng TANG
发明人： Zhiping JIANG , Zhuhong ZHANG , Xuefeng TANG
IPC分类号： H04J14/02 , H04B10/077
CPC分类号： H04J14/0276 , H04B10/077 , H04B10/0775 , H04B10/2504 , H04B10/516 , H04B2210/075 , H04J14/06
摘要： The present applies to digital wavelength converters that convert, independently of the format in which optical data may be encoded, an input waveform at a first wavelength to an output waveform at a second wavelength. When operating in an environment where an input waveform has a pilot tone associated thereto, the method and system of the present disclosure allows for the removal of the pilot tone from the input waveform, and also allows for the addition of another pilot to the output waveform.
摘要翻译：本发明适用于与光学数据可被编码的格式独立地将第一波长的输入波形转换为第二波长的输出波形的数字波长转换器。当在输入波形具有与其相关联的导频音的环境中操作时，本公开的方法和系统允许从输入波形中去除导频音，并且还允许将另外的导频添加到输出波形。

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