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公开(公告)号：US5193224A
公开(公告)日：1993-03-09
申请号：US690432
申请日：1991-04-24
申请人： John D. McNicol , Stephen G. Harman
发明人： John D. McNicol , Stephen G. Harman
CPC分类号： H03F1/3247 , H03C3/08 , H03F1/3258 , H03F1/3282 , H04L27/368 , H03F2200/438 , H03F2201/3233
摘要： In a QAM microwave radio communications system an IF (intermediate frequency) input signal is amplified and predistorted, and the amplified IF signal is mixed with a local oscillator signal to produce an RF (radio frequency) signal which is amplified in a power amplifier for transmission, the predistortion compensating for non-linearity of the power amplifier. Adaptive phase control of the predistorter is provided by mixing the local oscillator signal with part of the RF signal to produce an IF output signal representative of the output of the power amplifier, detecting phase differences between the IF input and IF output signals to produce a phase difference signal, selectively inverting the phase difference signal in dependence upon whether or not an IF signal amplitude exceeds a comparison level, and integrating the selectively inverted phase difference signal to produce a phase control signal for the predistorter.
摘要翻译： 在QAM微波无线电通信系统中，IF（中频）输入信号被放大和预失真，并且放大的IF信号与本地振荡器信号混合以产生RF（射频）信号，该RF（射频）信号在用于传输的功率放大器中被放大 ，补偿功率放大器非线性的预失真。 通过将本地振荡器信号与RF信号的一部分混合来产生预失真器的自适应相位控制，以产生表示功率放大器的输出的IF输出信号，检测IF输入和IF输出信号之间的相位差，以产生相位 差分信号，根据IF信号幅度是否超过比较电平，选择性地反相相位差信号，并积分有选择地反相的相位差信号，以产生用于预失真器的相位控制信号。
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公开(公告)号：US5170495A
公开(公告)日：1992-12-08
申请号：US607385
申请日：1990-10-31
申请人： John D. McNicol , Stephen G. Harman
发明人： John D. McNicol , Stephen G. Harman
CPC分类号： H03G3/3042 , H04B2001/0425
摘要： In a QAM microwave radio communications system an IF (intermediate frequency) input signal is amplified and predistorted, and the amplified IF signal is mixed with a local oscillator signal to produce an RF (radio frequency) signal which is amplified in a power amplifier for transmission, the predistortion compensating for non-linear gain of the power amplifier. Clipping in the power amplifier is controlled by down-converting part of the RF signal to produce an IF output signal, monitoring amplitude distortion of the RF signal by comparing the IF output signal with the IF input signal, and controlling the IF amplifier gain in dependence upon the monitored amplitude distortion.
摘要翻译： 在QAM微波无线电通信系统中，IF（中频）输入信号被放大和预失真，并且放大的IF信号与本地振荡器信号混合以产生RF（射频）信号，该RF（射频）信号在用于传输的功率放大器中被放大 ，预失真补偿功率放大器的非线性增益。 功率放大器中的钳位通过下变频部分RF信号来控制，以产生IF输出信号，通过将IF输出信号与IF输入信号进行比较来监测RF信号的幅度失真，并依赖于IF放大器增益 受监控的幅度失真。
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公开(公告)号：US20140328584A1
公开(公告)日：2014-11-06
申请号：US13851574
申请日：2013-03-27
申请人： Han H. Sun , John D. McNicol , Kuang-Tsan Wu
发明人： Han H. Sun , John D. McNicol , Kuang-Tsan Wu
IPC分类号： H04B10/61 , H04J14/02 , H04B10/079 , H04B10/58
CPC分类号： H04B10/6165 , H04B10/506 , H04B10/58 , H04J14/02
摘要： An optical transmitter may include an optical source to provide a first optical signal having a varying frequency; an optical circuit to receive a portion of the first optical signal and provide a second optical signal corresponding to a change in frequency of the first optical signal; a photodetector to receive the first optical signal and provide an electrical signal that is indicative of the change in frequency of the first optical signal; an integrator to receive the electrical signal and provide an inverted electrical signal; and a controller to process the inverted electrical signal and provide a current, associated with the inverted electrical signal, to the optical source. The optical source may reduce the phase noise associated with the first optical signal based on the current.
摘要翻译： 光发射机可以包括光源以提供具有变化频率的第一光信号; 光电路，用于接收所述第一光信号的一部分，并提供对应于所述第一光信号的频率变化的第二光信号; 光电检测器，用于接收第一光信号并提供指示第一光信号的频率变化的电信号; 积分器，用于接收电信号并提供反相电信号; 以及控制器，用于处理所述反相电信号并将与所述反相电信号相关联的电流提供给所述光源。 光源可以基于电流减小与第一光信号相关联的相位噪声。
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4.发明授权公开(公告)号：US08768177B2
公开(公告)日：2014-07-01
申请号：US12897784
申请日：2010-10-05
IPC分类号： H04B10/58
CPC分类号： H04J14/06 , H04J14/026 , H04L1/007
摘要： Consistent with the present disclosure, data, in digital form, is received by a transmit nodes of an optical communication, and converted to analog signal by a digital-to-analog converter (DAC) to drive a modulator. The modulator, in turn, modulates light at one of a plurality of wavelengths in accordance with the received data. The modulated light is then transmitted over an optical communication path to a receive node. At the receive node, the modulated optical signal, as well as other modulated optical signals are supplied to a photodetector circuit, which receives additional light at one of the optical signal wavelengths from a local oscillator laser. An analog-to-digital converter (ADC) is provided in the receive node to convert the electrical signals output from the photodetector into digital form. The output from the ADC is then filtered in the electrical domain, such that optical demultiplexing of individual channels is unnecessary.
摘要翻译： 与本公开一致，数字形式的数据由光通信的发射节点接收，并由数模转换器（DAC）转换为模拟信号以驱动调制器。 调制器又根据接收的数据调制多个波长中的一个波长的光。 然后将调制的光通过光通信路径传输到接收节点。 在接收节点处，调制的光信号以及其它调制的光信号被提供给光电检测器电路，光电检测器电路从本地振荡器激光器接收来自光信号波长之一的附加光。 在接收节点中提供模数转换器（ADC），以将从光电检测器输出的电信号转换为数字形式。 然后在电域中对来自ADC的输出进行滤波，使得各个信道的光解复用是不必要的。
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5.发明申请公开(公告)号：US20120251119A1
公开(公告)日：2012-10-04
申请号：US13078888
申请日：2011-04-01
IPC分类号： H04J14/02
CPC分类号： H04J14/02 , H04J14/0256 , H04J14/026 , H04J14/06
摘要： Consistent with the present disclosure, data, in digital form, is received by a transmit node of an optical communication, and converted to analog signal by a digital-to-analog converter (DAC) to drive a modulator. The modulator, in turn, modulates light at one of a plurality of wavelengths in accordance with the received data forming a plurality of corresponding carriers. The plurality of carriers are then optically combined with a fixed spacing combiner to form a superchannel of a fixed capacity. Accordingly, the number of carriers are selected according to a modulation format and symbol rate to realize the fixed capacity, for example. The superchannel is then transmitted over an optical communication path to a receive node. At the receive node, the superchannel is optically demultiplexed from a plurality of other superchannels. The plurality of carriers are then supplied to a photodetector circuit, which receives additional light at one of the optical signal carrier wavelengths from a local oscillator laser. An analog-to-digital converter (ADC) is provided in the receive node to convert the electrical signals output from the photodetector into digital form. The output from the ADC is then filtered in the electrical domain, such that optical demultiplexing of the carriers is unnecessary.
摘要翻译： 根据本公开，数字形式的数据由光通信的发送节点接收，并由数模转换器（DAC）转换成模拟信号以驱动调制器。 调制器又根据形成多个相应载波的接收数据调制多个波长中的一个波长的光。 然后将多个载波与固定间隔组合器光学组合以形成固定容量的超级通道。 因此，例如，根据调制格式和符号率来选择载波的数量以实现固定容量。 然后，超信道通过光通信路径传输到接收节点。 在接收节点处，超级信道从多个其他超级信道被光解复用。 然后将多个载波提供给光电检测器电路，该电路从本地振荡器激光器接收来自光信号载波波长的其中一个附加光。 在接收节点中提供模数转换器（ADC），以将从光电检测器输出的电信号转换为数字形式。 然后在电域中对ADC的输出进行滤波，使得载波的光解复用是不必要的。
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公开(公告)号：US20120251118A1
公开(公告)日：2012-10-04
申请号：US13078157
申请日：2011-04-01
申请人： John D. McNicol
发明人： John D. McNicol
IPC分类号： H04J14/02
摘要： Consistent with the present disclosure, a coherent detector is provided that includes an optical hybrid that supplies optical signals including local oscillator light to a balanced detector. The amount of imbalance or “balance error” in the balanced detector is identified by comparing an output of the balanced detector and an output of a photodiode that receives a portion of an input optical signal provided to the optical hybrid. Based on the balance error, electrical signals generated by the balanced detector or the power of optical signals passing through (or output from) the optical hybrid circuit can be adjusted so that the balance error is minimized or reduced to zero. As a result, imbalance associated with the balanced detector is corrected so that unwanted currents and/or related electrical signals are cancelled out or substantially cancelled out. Such unwanted currents and/or related electrical signals are generated in response to noise in the local oscillator light as well as intensity noise associated with non-selected optical signals in a superchannel.
摘要翻译： 根据本公开，提供了一种相干检测器，其包括将包括本地振荡器光的光学信号提供给平衡检测器的光学混合器。 通过比较平衡检测器的输出和接收提供给光混合器的输入光信号的一部分的光电二极管的输出来识别平衡检测器中的不平衡或平衡误差的量。 基于平衡误差，可以调节由平衡检测器产生的电信号或通过光混合电路（或从光混合电路输出）的光信号的功率，使得平衡误差最小化或减小到零。 结果，校正与平衡检测器相关的不平衡，使得不需要的电流和/或相关的电信号被抵消或基本上被抵消。 响应于本地振荡器光中的噪声以及与超声道中的未选择的光信号相关联的强度噪声而产生这种不需要的电流和/或相关的电信号。
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公开(公告)号：US4977580A
公开(公告)日：1990-12-11
申请号：US256958
申请日：1988-10-13
申请人： John D. McNicol
发明人： John D. McNicol
IPC分类号： H04L27/22 , H04J3/00 , H04L7/00 , H04L7/02 , H04L7/027 , H04L7/10 , H04L27/00 , H04L27/227 , H04L27/233
CPC分类号： H04L7/0029 , H04L27/2273 , H04L27/2276 , H04L27/2332 , H04L2027/003 , H04L2027/0048 , H04L2027/0095 , H04L7/0274
摘要： The present invention provides a method of detecting the clock rate and recovering the carrier in a TDMA (time division multiple access) signal. The quadrature baseband components are stored for a predetermined amount of time as sampled data and the clock phase error of the baseband samples are estimated. The clock phase of the baseband samples are corrected from the estimated clock phase error by using interpolation over the sampled quadrature components. The carrier phase error of the stored baseband time corrected quadrature samples are then estimated and the carrier phase is corrected according to the estimated phase error. The corrected clock and carrier signals are then forwarded to decision circuit means for providing demodulated data.
摘要翻译： 本发明提供了一种在TDMA（时分多址）信号中检测时钟速率和恢复载波的方法。 将正交基带分量作为采样数据存储预定量的时间，并估计基带采样的时钟相位误差。 通过对采样的正交分量进行插值，从估计的时钟相位误差校正基带采样的时钟相位。 然后估计存储的基带时间校正正交采样的载波相位误差，并根据估计的相位误差校正载波相位。 校正的时钟和载波信号然后被转发到用于提供解调数据的判定电路装置。
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公开(公告)号：US09130681B2
公开(公告)日：2015-09-08
申请号：US13851574
申请日：2013-03-27
申请人： Han H. Sun , John D. McNicol , Kuang-Tsan Wu
发明人： Han H. Sun , John D. McNicol , Kuang-Tsan Wu
CPC分类号： H04B10/6165 , H04B10/506 , H04B10/58 , H04J14/02
摘要： An optical transmitter may include an optical source to provide a first optical signal having a varying frequency; an optical circuit to receive a portion of the first optical signal and provide a second optical signal corresponding to a change in frequency of the first optical signal; a photodetector to receive the first optical signal and provide an electrical signal that is indicative of the change in frequency of the first optical signal; an integrator to receive the electrical signal and provide an inverted electrical signal; and a controller to process the inverted electrical signal and provide a current, associated with the inverted electrical signal, to the optical source. The optical source may reduce the phase noise associated with the first optical signal based on the current.
摘要翻译： 光发射机可以包括光源以提供具有变化频率的第一光信号; 光电路，用于接收所述第一光信号的一部分，并提供对应于所述第一光信号的频率变化的第二光信号; 光电检测器，用于接收第一光信号并提供指示第一光信号的频率变化的电信号; 积分器，用于接收电信号并提供反相电信号; 以及控制器，用于处理所述反相电信号并将与所述反相电信号相关联的电流提供给所述光源。 光源可以基于电流减小与第一光信号相关联的相位噪声。
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9.发明授权公开(公告)号：US08639118B2
公开(公告)日：2014-01-28
申请号：US12897787
申请日：2010-10-05
IPC分类号： H04J14/02
CPC分类号： H04J14/02 , H04B10/616 , H04J14/0224 , H04J14/0227 , H04J14/0241 , H04J14/026 , H04J14/0279 , H04J14/06 , H04L1/0007 , H04L1/0009 , H04L5/0008 , H04L25/03834 , H04L27/0008 , H04L27/2035 , H04L27/223 , H04L27/34
摘要： Consistent with the present disclosure, data, in digital form, is received by a transmit nodes of an optical communication, and converted to analog signal by a digital-to-analog converter (DAC) to drive a modulator. The modulator, in turn, modulates light at one of a plurality of wavelengths in accordance with the received data. The modulated light is then transmitted over an optical communication path to a receive node. At the receive node, the modulated optical signal, as well as other modulated optical signals are supplied to a photodetector circuit, which receives additional light at one of the optical signal wavelengths from a local oscillator laser. An analog-to-digital converter (ADC) is provided in the receive node to convert the electrical signals output from the photodetector into digital form. The output from the ADC is then filtered in the electrical domain, such that optical demultiplexing of individual channels is unnecessary.
摘要翻译： 与本公开一致，数字形式的数据由光通信的发射节点接收，并由数模转换器（DAC）转换为模拟信号以驱动调制器。 调制器又根据接收的数据调制多个波长中的一个波长的光。 然后将调制的光通过光通信路径传输到接收节点。 在接收节点处，调制的光信号以及其它调制的光信号被提供给光电检测器电路，光电检测器电路从本地振荡器激光器接收来自光信号波长之一的附加光。 在接收节点中提供模数转换器（ADC），以将从光电检测器输出的电信号转换为数字形式。 然后在电域中对来自ADC的输出进行滤波，使得各个信道的光解复用是不必要的。
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公开(公告)号：US20120082466A1
公开(公告)日：2012-04-05
申请号：US12897786
申请日：2010-10-05
IPC分类号： H04B10/04
CPC分类号： H04B10/516 , H04B10/2575
摘要： Consistent with the present disclosure, data, in digital form, is received by a transmit nodes of an optical communication, and converted to analog signal by a digital-to-analog converter (DAC) to drive a modulator. The modulator, in turn, modulates light at one of a plurality of wavelengths in accordance with the received data. The modulated light is then transmitted over an optical communication path to a receive node. At the receive node, the modulated optical signal, as well as other modulated optical signals are supplied to a photodetector circuit, which receives additional light at one of the optical signal wavelengths from a local oscillator laser. An analog-to-digital converter (ADC) is provided in the receive node to convert the electrical signals output from the photodetector into digital form. The output from the ADC is then filtered in the electrical domain, such that optical demultiplexing of individual channels is unnecessary.
摘要翻译： 与本公开一致，数字形式的数据由光通信的发射节点接收，并由数模转换器（DAC）转换为模拟信号以驱动调制器。 调制器又根据接收的数据调制多个波长中的一个波长的光。 然后将调制的光通过光通信路径传输到接收节点。 在接收节点处，调制的光信号以及其它调制的光信号被提供给光电检测器电路，光电检测器电路从本地振荡器激光器接收来自光信号波长之一的附加光。 在接收节点中提供模数转换器（ADC），以将从光电检测器输出的电信号转换为数字形式。 然后在电域中对来自ADC的输出进行滤波，使得各个信道的光解复用是不必要的。
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