-
公开(公告)号：US20070229937A1
公开(公告)日：2007-10-04
申请号：US11396185
申请日：2006-03-31
CPC分类号： G02F2/002 , G02F1/3534 , G02F2203/13
摘要： Terahertz waves are generated by modulating the output of a cw laser to produce an optical signal with equally spaced frequency components. The modulated optical signal is supplied to a nonlinear optical waveguide in which it undergoes self-phase modulation, thereby producing at least two further frequency components that are separated by a desired frequency in the terahertz gap and have a sufficient magnitude. An optical filter selects the two frequency components, which are directed to a photomixer, that produces an electrical signal with the same frequency as the beat frequency. The photomixer is biased, and coupled to an antenna, so that the resulting electrical signal causes an electromagnetic wave having a frequency in the terahertz range to propagate from the antenna.
摘要翻译： 通过调制cw激光器的输出以产生具有等间隔的频率分量的光信号来产生太赫兹波。 调制的光信号被提供给非线性光波导，其中它进行自相位调制，由此产生至少两个在太赫兹间隙中以期望频率分开的另外的频率分量，并具有足够的幅度。 光学滤波器选择针对光混合器的两个频率分量，其产生与拍频相同频率的电信号。 该混色器被偏置并且耦合到天线，使得所得到的电信号使得具有太赫兹范围内的频率的电磁波从天线传播。
-
公开(公告)号：US20050123068A1
公开(公告)日：2005-06-09
申请号：US10730413
申请日：2003-12-08
IPC分类号： H04L25/497 , H03M5/18 , H04B10/04 , H04B10/06 , H04B10/14 , H04B10/142 , H04B10/152 , H04B10/155 , H04B10/158 , H04B10/26 , H04B10/28 , H04L7/04 , H04L25/06 , H04L25/49
CPC分类号： H04L25/068 , H04B10/69 , H04L7/042 , H04L25/4923
摘要： An optical receiver adapted to process an optical duobinary signal received over a transmission link in an optical communication system. In one embodiment, the receiver has an optical-to-electrical signal converter coupled to a decoder. The decoder processes an electrical signal generated by the converter to generate a bit sequence corresponding to the optical signal. To generate a bit value, the decoder integrates the electrical signal using a sampling window and compares the integration result with a decision threshold value. In one configuration, the width of the sampling window and the decision threshold value are selected based on the eye diagram and noise distribution function, respectively, corresponding to the optical signal. Advantageously, embodiments of the present invention improve overall back-to-back (i.e., source-to-destination) system performance, e.g., by improving dispersion tolerance and/or reducing optical power corresponding to a selected bit error rate value.
摘要翻译： 一种适于处理在光通信系统中通过传输链路接收的光双二进制信号的光接收机。 在一个实施例中，接收机具有耦合到解码器的光电信号转换器。 解码器处理由转换器产生的电信号以产生对应于光信号的比特序列。 为了产生位值，解码器使用采样窗口对电信号进行积分，并将积分结果与判定阈值进行比较。 在一种配置中，分别基于对应于光信号的眼图和噪声分布函数来选择采样窗口的宽度和判定阈值。 有利地，本发明的实施例例如通过改善对应于所选位错误率值的色散容限和/或减少光功率来改进整体背靠背（即源到目的地）系统性能。
-
公开(公告)号：US20070071454A1
公开(公告)日：2007-03-29
申请号：US11239656
申请日：2005-09-29
IPC分类号： H04B10/04
CPC分类号： H04B10/5165 , H04B10/505 , H04B10/5162 , H04B10/5167 , H04L7/0075 , H04L7/027
摘要： A method and system for ultra-high bit rate fiber-optic communications (e.g., 160 Gb/s) utilize a phase-correlated modulation format where phases of bits in adjacent four-bit groups in transmitted optical pulse trains are altered by π (or 180°).
摘要翻译： 用于超高比特率光纤通信（例如，160Gb / s）的方法和系统利用相位相关调制格式，其中传输的光脉冲串中的相邻四比特组中的比特的相位被pi（或 180°）。
-
4.发明申请公开(公告)号：US20050041979A1
公开(公告)日：2005-02-24
申请号：US10942342
申请日：2004-09-16
CPC分类号： H04B10/2507
摘要： Method and apparatus for data recovery in optical transmission systems include parallel detection subcircuits for determining output values of sequentially provided optical data bits such that sequentially provided optical data bits are alternately processed by respective ones of the parallel detection subcircuits. For example, in one embodiment of the present invention, clock values to be used for timing provided to the first parallel detection subcircuit are 180° out of phase with clock values provided to the second parallel detection subcircuit, such that the first parallel detection subcircuit and the second parallel detection subcircuit alternately process input optical data bits according to odd valued clock signals and even valued clock signals. Furthermore, the outputs of the parallel detection subcircuits are connected crosswise to provide control signals for their parallel counterparts. In principle, various decisions are made using decision circuits and desired output values are selected based on the previously decided bits.
摘要翻译： 用于光传输系统中的数据恢复的方法和装置包括用于确定顺序提供的光数据位的输出值的并行检测子电路，使得顺序提供的光数据位被相应的并行检测子电路交替处理。 例如，在本发明的一个实施例中，用于提供给第一并行检测子电路的定时的时钟值与提供给第二并行检测子电路的时钟值相差180°，使得第一并行检测子电路和 第二并行检测分支电路根据奇数值时钟信号和偶数值时钟信号交替地处理输入光数据位。 此外，并行检测子电路的输出是交叉连接的，以提供它们的并行检测子系统的控制信号。 原则上，使用决策电路进行各种决定，并且基于先前确定的位选择期望的输出值。
-
-
-
搜索结果
4 条记录 (耗时 0.022 秒)
