公开(公告)号：US08306435B2

公开(公告)日：2012-11-06

申请号：US12527112

申请日：2008-02-15

申请人： Jean Armstrong ,  Arthur Lowery

发明人： Jean Armstrong ,  Arthur Lowery

IPC分类号： H04B10/158

CPC分类号： H04B10/67

摘要： A receiver for recovering transmitted information carried by a received optical signal that has been affected by dispersion includes an optical splitter having an input port arranged to receive the received optical signal, and a plurality of output ports. A proportion of optical power at the input port is transmitted to each of the output ports. A plurality of optical detectors is operably connected to respective output ports of the optical splitter, for generating a corresponding plurality of electrical signals. Optical phase shifters are disposed between the output ports of the optical splitter and respective optical detectors. As a result, each optical phase shifter applies a frequency dependent phase shift to an optical signal passing therethrough. An electronic processor includes analog and/or digital electronic components configured to combine two or more of the plurality of electrical signals, or information recovered separately therefrom, in order to provide improved accuracy or reliability of information recovery as compared with detecting and processing only the received optical signal. The receiver is advantageously able to mitigate the effects of frequency-dependent fading which may occur in intensity modulation/direct detection optical transmission systems due to dispersion in optical transmission paths.

摘要翻译： 用于恢复由受色散影响的接收光信号承载的发送信息的接收机包括具有布置成接收所接收的光信号的输入端口的光分路器和多个输出端口。 输入端口的光功率的比例被发送到每个输出端口。 多个光学检测器可操作地连接到光分路器的相应输出端口，用于产生相应的多个电信号。 光移相器设置在光分路器的输出端口和相应的光检测器之间。 结果，每个光学移相器对通过其的光信号施加频率相关相移。 电子处理器包括被配置为组合多个电信号中的两个或更多个或从其单独回收的信息的模拟和/或数字电子部件，以便与仅检测和处理所接收的信号相比，提供信息恢复的改进的准确性或可靠性 光信号。 接收机有利地能够减轻由于光传输路径中的色散而在强度调制/直接检测光传输系统中可能发生的频率依赖衰落的影响。

公开(公告)号：US20100247099A1

公开(公告)日：2010-09-30

申请号：US12445386

申请日：2007-12-20

申请人： Arthur Lowery ,  Liang Bangyuan Du

发明人： Arthur Lowery ,  Liang Bangyuan Du

IPC分类号： H04J14/02 ,  H04B10/04

CPC分类号： H04L27/2627 ,  H04B10/2543 ,  H04B10/6163 ,  H04B2210/254 ,  H04L25/03343 ,  H04L27/2096 ,  H04L27/2697 ,  H04L27/367 ,  H04L2025/03414

摘要： A method of transmitting information over a non-linear optical channel includes the step (152) of generating an information-bearing signal, preferably an OFDM signal, which includes a plurality of closely-spaced sub-carriers in the frequency domain. A time-varying phase modulation is determined (154), which is a first function, and preferably a linear function, of the transmitted optical power corresponding with the information-bearing signal. The information-bearing signal and the time-varying phase modulation are applied (156) to an optical source in order to generate a corresponding transmitted optical signal having substantially the stated transmitted optical power characteristic. The first function of transmitted optical power is selected so as to mitigate the effect of the non-linearity of the optical channel upon the transmitted optical signal. In alternative arrangements, a time-varying phase modulation, being a second function of optical power, is computed (162) and applied (164) to a signal received following transmission through a non-linear optical channel. The two alternative arrangements provide, respectively, for pre-compensation and post-compensation of non-linear propagation effects that may be carried out entirely within the electrical domain, for example using digital signal processing techniques.

摘要翻译： 通过非线性光信道发送信息的方法包括生成信息承载信号（优选地，OFDM信号）的步骤（152），OFDM信号包括在频域中的多个紧密间隔的子载波。 确定时变相位调制（154），其是与信息承载信号相对应的发射光功率的第一函数，并且优选地是线性函数。 将信息承载信号和时变相位调制（156）应用于光源，以便产生具有基本上所述的传输光功率特性的对应的传输光信号。 选择发射光功率的第一功能是为了减轻光信道对发射光信号的非线性的影响。 在替代布置中，作为光功率的第二功能的时变相位调制被计算（162）并且应用于（164）到通过非线性光信道传输之后接收的信号。 两种替代方案分别提供了可以完全在电域范围内进行的非线性传播效应的预补偿和后补偿，例如使用数字信号处理技术。

公开(公告)号：US20100142951A1

公开(公告)日：2010-06-10

申请号：US12527112

申请日：2008-02-15

申请人： Jean Armstrong ,  Arthur Lowery

发明人： Jean Armstrong ,  Arthur Lowery

IPC分类号： H04J14/06 ,  H04B10/06 ,  H04J14/00

CPC分类号： H04B10/67

摘要： A receiver for recovering transmitted information carried by a received optical signal that has been affected by dispersion includes an optical splitter having an input port arranged to receive the received optical signal, and a plurality of output ports. A proportion of optical power at the input port is transmitted to each of the output ports. A plurality of optical detectors is operably connected to respective output ports of the optical splitter, for generating a corresponding plurality of electrical signals. Optical phase shifters are disposed between the output ports of the optical splitter and respective optical detectors. As a result, each optical phase shifter applies a frequency dependent phase shift to an optical signal passing therethrough. An electronic processor includes analog and/or digital electronic components configured to combine two or more of the plurality of electrical signals, or information recovered separately therefrom, in order to provide improved accuracy or reliability of information recovery as compared with detecting and processing only the received optical signal. The receiver is advantageously able to mitigate the effects of frequency-dependent fading which may occur in intensity modulation/direct detection optical transmission systems due to dispersion in optical transmission paths.

摘要翻译： 用于恢复由受色散影响的接收光信号承载的发送信息的接收机包括具有布置成接收所接收的光信号的输入端口的光分路器和多个输出端口。 输入端口的光功率的比例被发送到每个输出端口。 多个光学检测器可操作地连接到光分路器的相应输出端口，用于产生相应的多个电信号。 光移相器设置在光分路器的输出端口和相应的光检测器之间。 结果，每个光学移相器对通过其的光信号施加频率相关相移。 电子处理器包括被配置为组合多个电信号中的两个或更多个或从其单独回收的信息的模拟和/或数字电子部件，以便与仅检测和处理所接收的信号相比，提供信息恢复的改进的准确性或可靠性 光信号。 接收机有利地能够减轻由于光传输路径中的色散而在强度调制/直接检测光传输系统中可能发生的频率依赖衰落的影响。