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    • 3. 发明申请
    • FORWARD ERROR CORRECTION FOR AN OPTICAL TRANSPORT SYSTEM
    • 光传输系统的前向纠错
    • US20140003813A1
    • 2014-01-02
    • US13537131
    • 2012-06-29
    • Timo J. PfauNoriaki KanedaBrian S. Krongold
    • Timo J. PfauNoriaki KanedaBrian S. Krongold
    • H04B10/18H04B10/06H04J14/06
    • H04J14/06H04B10/0799H04B10/611H04B10/613H04B10/614H04B10/616H04L1/0041H04L1/0054H04L1/0057H04L27/2096
    • An optical transport system that transmits data using relatively short FEC-encoded data frames. The corresponding modulated optical signals are decoded at an optical receiver using frame-based maximum likelihood sequence estimation that relies on data redundancy present in each FEC-encoded data frame for the determination of its source bits. In some embodiments, the modulated optical signals carrying the FEC-encoded data frames are generated using a polarization-division-multiplexed constellation. The FEC-coding rate and frame length can be adjusted without changing the constellation, which advantageously enables the optical transport system to dynamically adapt its transmission format to the changing link conditions in a manner that results in better overall receiver sensitivity than that achieved with comparable bit-rate-adaptation methods that rely on a constellation change rather than on a change of the FEC-coding rate.
    • 使用相对较短的FEC编码数据帧发送数据的光传输系统。 使用基于帧的最大似然序列估计,在光接收机处对相应的调制光信号进行解码,该估计依赖于每个FEC编码数据帧中存在的用于确定其源位的数据冗余。 在一些实施例中,使用偏振分复用星座生成携带FEC编码数据帧的调制光信号。 可以在不改变星座的情况下调整FEC编码速率和帧长度,这有利于使光传输系统能够使其传输格式动态地适应变化的链路条件,从而导致更好的总接收机灵敏度,而不是用比较比特 依赖于星座变化而不是基于FEC编码速率的变化的速率适配方法。
    • 4. 发明授权
    • Forward error correction for an optical transport system
    • 光传输系统的前向纠错
    • US08983294B2
    • 2015-03-17
    • US13537131
    • 2012-06-29
    • Timo J. PfauNoriaki KanedaBrian S. Krongold
    • Timo J. PfauNoriaki KanedaBrian S. Krongold
    • H04J14/06H04B10/61H04B10/079H04L1/00H04L27/20
    • H04J14/06H04B10/0799H04B10/611H04B10/613H04B10/614H04B10/616H04L1/0041H04L1/0054H04L1/0057H04L27/2096
    • An optical transport system that transmits data using relatively short FEC-encoded data frames. The corresponding modulated optical signals are decoded at an optical receiver using frame-based maximum likelihood sequence estimation that relies on data redundancy present in each FEC-encoded data frame for the determination of its source bits. In some embodiments, the modulated optical signals carrying the FEC-encoded data frames are generated using a polarization-division-multiplexed constellation. The FEC-coding rate and frame length can be adjusted without changing the constellation, which advantageously enables the optical transport system to dynamically adapt its transmission format to the changing link conditions in a manner that results in better overall receiver sensitivity than that achieved with comparable bit-rate-adaptation methods that rely on a constellation change rather than on a change of the FEC-coding rate.
    • 使用相对较短的FEC编码数据帧发送数据的光传输系统。 使用基于帧的最大似然序列估计,在光接收机处对相应的调制光信号进行解码,该估计依赖于每个FEC编码数据帧中存在的用于确定其源位的数据冗余。 在一些实施例中,使用偏振分复用星座生成携带FEC编码数据帧的调制光信号。 可以在不改变星座的情况下调整FEC编码速率和帧长度,这有利于使光传输系统能够使其传输格式动态地适应变化的链路条件,从而导致更好的总接收机灵敏度,而不是用比较比特 依赖于星座变化而不是基于FEC编码速率的变化的速率适配方法。
    • 5. 发明授权
    • Multiple-input method and apparatus of free-space optical communication
    • 自由空间光通信的多输入方法和装置
    • US09048950B2
    • 2015-06-02
    • US12915506
    • 2010-10-29
    • Young-kai ChenNoriaki KanedaAlex Pidwerbetsky
    • Young-kai ChenNoriaki KanedaAlex Pidwerbetsky
    • H04B10/00H04B10/112
    • H04B10/1121H04B10/613
    • An approach is provided that uses diversity to compensate fading of free-space optical (FSO) signals propagating through an environment characterized by atmospheric scintillation. One embodiment involves collecting at least one FSO beam, demultiplexing the beam by wavelength into at least two sub-beams, detecting each sub-beam to produce an electrical output therefrom, and recovering a signal using complementary information from at least two of the electrical outputs. Another embodiment involves collecting the FSO beam onto an array of spatially separated sub-apertures, detecting the light entering each sub-aperture to produce an electrical output therefrom, and recovering a signal using complementary information from at least two of the electrical outputs. This second embodiment enables both electronic adaptive processing to coherently integrate across the sub-apertures and in the case of multiple transmit apertures a free space optical Multiple Input Multiple Output (MIMO) system.
    • 提供了一种使用分集来补偿通过大气闪烁特征的环境传播的自由空间光(FSO)信号的衰落的方法。 一个实施例涉及收集至少一个FSO波束,通过波长将光束解复用为至少两个子波束,检测每个子波束以产生电输出,以及使用来自至少两个电输出的补充信息来恢复信号 。 另一个实施例涉及将FSO光束收集到空间上分离的子孔径阵列上,检测进入每个子孔径的光以产生其电输出,以及使用来自至少两个电输出的补充信息来恢复信号。 该第二实施例使得电子自适应处理能够在子孔径之间相干地集成,并且在多个发射孔径的情况下使得自由空间光学多输入多输出(MIMO)系统。
    • 7. 发明申请
    • Frequncy estimation in an intradyne optical receiver
    • 内插光接收机中的频率估计
    • US20080152361A1
    • 2008-06-26
    • US11644536
    • 2006-12-22
    • Young-Kai ChenNoriaki KanedaUt-Va KocAndreas Bertold Leven
    • Young-Kai ChenNoriaki KanedaUt-Va KocAndreas Bertold Leven
    • H04B10/06
    • H04B10/611H04B10/61H04B10/6161H04B10/6164H04B10/6165H04B10/6166
    • A method for determining symbols PSK modulated on an optical carrier includes interfering a first polarization component of the modulated optical carrier and a reference optical carrier in a first optical mixer and interfering the first polarization component of the modulated optical carrier and the reference with a different relative phase in a second optical mixer. The method also includes sampling the interfered carriers from the first optical mixer to produce first digital sampled values and sampling the interfered carriers from the second optical mixer to produce second digital sampled values. The first and second digital sampled values of a sampling period form a first complex sampling value thereof. The method also includes offsetting a phase of a complex signal value corresponding to each first complex sampling value to correct for a phase error caused by a frequency offset between the modulated and reference optical carriers.
    • 一种用于确定在光载波上调制的符号PSK的方法包括:在第一光混合器中干扰调制光载波的第一偏振分量和参考光载波,并将调制的光载波的第一偏振分量与参考用不同的相对 在第二光学混合器中。 该方法还包括对来自第一光混合器的受干扰载波进行采样,以产生第一数字采样值,并对来自第二光混合器的干扰载波进行采样以产生第二数字采样值。 采样周期的第一和第二数字采样值形成其第一复数采样值。 该方法还包括抵消对应于每个第一复数采样值的复信号值的相位,以校正由调制参考光载波之间的频率偏移引起的相位误差。
    • 9. 发明申请
    • Multiple-Input Method And Apparatus Of Free-Space Optical Communication
    • 自由空间光通信的多输入法和装置
    • US20120008961A1
    • 2012-01-12
    • US12915506
    • 2010-10-29
    • Young-Kai ChenNoriaki KanedaAlex Pidwerbetsky
    • Young-Kai ChenNoriaki KanedaAlex Pidwerbetsky
    • H04B10/00
    • H04B10/1121H04B10/613
    • An approach is provided that uses diversity to compensate fading of free-space optical (FSO) signals propagating through an environment characterized by atmospheric scintillation. One embodiment involves collecting at least one FSO beam, demultiplexing the beam by wavelength into at least two sub-beams, detecting each sub-beam to produce an electrical output therefrom, and recovering a signal using complementary information from at least two of the electrical outputs. Another embodiment involves collecting the FSO beam onto an array of spatially separated sub-apertures, detecting the light entering each sub-aperture to produce an electrical output therefrom, and recovering a signal using complementary information from at least two of the electrical outputs. This second embodiment enables both electronic adaptive processing to coherently integrate across the sub-apertures and in the case of multiple transmit apertures a free space optical Multiple Input Multiple Output (MIMO) system.
    • 提供了一种使用分集来补偿通过大气闪烁特征的环境传播的自由空间光(FSO)信号的衰落的方法。 一个实施例涉及收集至少一个FSO波束,通过波长将光束解复用为至少两个子波束,检测每个子波束以产生电输出,以及使用来自至少两个电输出的补充信息来恢复信号 。 另一个实施例涉及将FSO光束收集到空间上分离的子孔径阵列上,检测进入每个子孔径的光以产生其电输出,以及使用来自至少两个电输出的补充信息来恢复信号。 该第二实施例使得电子自适应处理能够在子孔径之间相干地集成,并且在多个发射孔径的情况下使得自由空间光学多输入多输出(MIMO)系统。
    • 10. 发明授权
    • Frequency estimation in an intradyne optical receiver
    • intradyne光接收机中的频率估计
    • US08073345B2
    • 2011-12-06
    • US11644536
    • 2006-12-22
    • Young-Kai ChenNoriaki KanedaUt-Va KocAndreas Bertold Leven
    • Young-Kai ChenNoriaki KanedaUt-Va KocAndreas Bertold Leven
    • H04B10/06
    • H04B10/611H04B10/61H04B10/6161H04B10/6164H04B10/6165H04B10/6166
    • A method for determining symbols PSK modulated on an optical carrier includes interfering a first polarization component of the modulated optical carrier and a reference optical carrier in a first optical mixer and interfering the first polarization component of the modulated optical carrier and the reference with a different relative phase in a second optical mixer. The method also includes sampling the interfered carriers from the first optical mixer to produce first digital sampled values and sampling the interfered carriers from the second optical mixer to produce second digital sampled values. The first and second digital sampled values of a sampling period form a first complex sampling value thereof. The method also includes offsetting a phase of a complex signal value corresponding to each first complex sampling value to correct for a phase error caused by a frequency offset between the modulated and reference optical carriers.
    • 一种用于确定在光载波上调制的符号PSK的方法包括:在第一光混合器中干扰调制光载波的第一偏振分量和参考光载波,并将调制的光载波的第一偏振分量与参考用不同的相对 在第二光学混合器中。 该方法还包括对来自第一光混合器的受干扰载波进行采样,以产生第一数字采样值,并对来自第二光混合器的干扰载波进行采样以产生第二数字采样值。 采样周期的第一和第二数字采样值形成其第一复数采样值。 该方法还包括抵消对应于每个第一复数采样值的复信号值的相位,以校正由调制参考光载波之间的频率偏移引起的相位误差。