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    • 1. 发明授权
    • Duobinary receiver
    • 二元接收器
    • US07613402B2
    • 2009-11-03
    • US10730413
    • 2003-12-08
    • Xiang LiuLothar Benedict Erhard Josef MoellerXing WeiChongjin Xie
    • Xiang LiuLothar Benedict Erhard Josef MoellerXing WeiChongjin Xie
    • H04B10/06
    • H04L25/068H04B10/69H04L7/042H04L25/4923
    • 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.
    • 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。
    • 5. 发明授权
    • PMD-reduction processing for a multi-channel receiver
    • 用于多通道接收机的PMD减少处理
    • US07330663B2
    • 2008-02-12
    • US10425432
    • 2003-04-29
    • Randy C. GilesXiang LiuChongjin Xie
    • Randy C. GilesXiang LiuChongjin Xie
    • H04B10/12
    • H04B10/2569H04J14/02
    • A multi-channel (e.g. WDM) receiver, in which l PMD compensators are time-shared by n (n>1) communication channels, where 1≦l≦n−1. The receiver implements PMD monitoring to identify channels exhibiting relatively high amounts of PMD. Some or all of the identified channels are then subjected, before decoding, to PMD-reduction processing, while the remaining channels are decoded without such processing. Channel allocation for the processing may be changed dynamically depending on the current amounts of PMD exhibited by various channels. Due to efficient utilization of PMD compensators, multi-channel receivers of the invention are capable of performance comparable to that of the corresponding fully compensated (i.e., having a dedicated PMD compensator for each channel) receivers, but at appreciably lower cost.
    • 多通道(例如WDM)接收机,其中1个PMD补偿器由n(n> 1)个通信信道共享,其中1≤l≤n-1。 接收机实现PMD监测,以识别显示相对较高量的PMD的信道。 然后在解码之前将所识别的一些或全部信道进行PMD减少处理,而在不进行这种处理的情况下对其余信道进行解码。 用于处理的信道分配可以根据各种信道所呈现的PMD的当前量而动态地改变。 由于PMD补偿器的有效利用,本发明的多通道接收机能够与相应的完全补偿(即,具有用于每个通道的专用PMD补偿器)接收机的性能相当,但成本明显较低。
    • 8. 发明授权
    • System and method of optical transmission
    • 光传输系统和方法
    • US07277647B2
    • 2007-10-02
    • US10099105
    • 2002-03-14
    • Douglas M GillXiang LiuXing Wei
    • Douglas M GillXiang LiuXing Wei
    • H04B10/04
    • H04B10/505H04B10/5053H04B10/5563
    • Minimum shift keying (MSK) is used as the coding scheme in a high bit rate optical transmission system, and the signal format is either RZ (return-to-zero) or NRZ (non-return-to-zero). The system can combine multiple individual channels with different wavelengths in a WDM or dense wavelength division multiplexed (DWDM) arrangement. Dispersion management can be provided using several techniques, such as quasi-linear transmissions or conventional RZ transmissions. At the transmitter, an optical MSK transmitter is used to modulate the phase of a stream of high bit rate (e.g., 40 Gbit/s) optical signals. Many such data streams can be combined in a wavelength division multiplexer and transmitted to a remote receiver, where the signal is wavelength division demultiplexed. The encoded data in each wavelength channel is then recovered by an MSK receiver, which may consist of a delay demodulator and a balanced detector.
    • 最小移位键控(MSK)用作高比特率光传输系统中的编码方案,信号格式为RZ(归零)或NRZ(非归零)。 该系统可以在WDM或密集波分复用(DWDM)布置中组合具有不同波长的多个单独信道。 可以使用几种技术来提供色散管理,例如准线性传输或常规RZ传输。 在发射机处,使用光学MSK发射机来调制高比特率(例如40Gbit / s)光信号流的相位。 许多这样的数据流可以组合在波分多路复用器中并被发送到远程接收机,其中信号被波分解复用。 每个波长信道中的编码数据然后由MSK接收机恢复,MSK接收机可以由延迟解调器和平衡检测器组成。