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    Adaptive clock recovery in asynchronous transfer mode networks
    3.
    发明授权
    Adaptive clock recovery in asynchronous transfer mode networks 有权
    异步传输模式网络中的自适应时钟恢复

    公开(公告)号：US06400683B1

    公开(公告)日：2002-06-04

    申请号：US09301820

    申请日：1999-04-29

    申请人： Alexandre Jay ,  Eric Saint Georges

    发明人： Alexandre Jay ,  Eric Saint Georges

    IPC分类号： H04L1256

    CPC分类号： H04J3/0632 ,  H04L2012/5674 ,  H04L2012/5681

    摘要： In a data communication network, a system clock rate can be inferred at a receiver by measuring the data rate during successive periods. This information is used to adjust or adapt a receiver output clock to the inferred system clock. To adapt a receiver buffer output clock frequency to the buffer input clock frequency, the level of the buffer is periodically monitored. If the fill level is greater than an upper threshold, the output clock frequency is incremented. If the fill level is less than a lower threshold, the output clock frequency is decremented. A count is maintained of the number of successive adjustment operations performed while the fill level is outside the range bounded by the thresholds. When the fill level returns to the bounded range, a number of reverse frequency adjustments are performed. The number of reverse frequency adjustments are less than the number of earlier opposite frequency adjustments, preferably by a factor of two. The reverse corrections converge the output clock frequency toward the input clock frequency, reducing oscillations.

    摘要翻译： 在数据通信网络中，可以通过在连续时段期间测量数据速率在接收机处推断系统时钟速率。 该信息用于将接收机输出时钟调整或调整为推断的系统时钟。 为了将接收缓冲器输出时钟频率调整到缓冲器输入时钟频率，定期监视缓冲器的电平。 如果填充电平大于上限阈值，则输出时钟频率递增。 如果填充电平小于下限阈值，则输出时钟频率递减。 在填充水平超出由阈值界定的范围之外时，维持连续调整操作次数的计数。 当填充水平返回到有界范围时，执行多次反向频率调整。 反向频率调整的数量小于较早的相对频率调整的数量，优选为2倍。 反向校正将输出时钟频率收敛到输入时钟频率，从而减少振荡。

    System and Method for Measuring Power of Optical Signals Carried Over a Fiber Optic Link
    5.
    发明申请
    System and Method for Measuring Power of Optical Signals Carried Over a Fiber Optic Link 失效
    通过光纤链路测量光信号功率的系统和方法

    公开(公告)号：US20060250608A1

    公开(公告)日：2006-11-09

    申请号：US11428987

    申请日：2006-07-06

    申请人： John Carrick ,  Paul Talmadge ,  Eric Saint Georges ,  Stuart Brorson

    发明人： John Carrick ,  Paul Talmadge ,  Eric Saint Georges ,  Stuart Brorson

    IPC分类号： G01J1/00

    CPC分类号： H04J14/0221 ,  H04B10/077 ,  H04B10/07955

    摘要： A pilot tone generator receives optical energy from an optical communication medium carrying a plurality of optical signals. Each optical signal carries data modulated at a unique wavelength and further modulated with a unique identification signal. The identification signal has an amplitude corresponding to an optical power of the associated optical signal. The pilot tone receiver detects each identification signal from the optical energy received and determines its corresponding amplitude. The pilot tone receiver calculates the optical power of each optical signal in the optical energy in response to the amplitude of the associated identification signal.

    摘要翻译： 导频音产生器从携带多个光信号的光通信介质接收光能。 每个光信号承载以独特波长进行调制的数据，并用唯一的识别信号进一步调制。 识别信号具有对应于相关联的光信号的光功率的幅度。 导频音接收器从接收的光能检测每个识别信号，并确定其对应的幅度。 导频音接收器响应于相关联的识别信号的幅度来计算光能中每个光信号的光功率。