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    • 5. 发明授权
    • Control of avalanche photodiodes bias voltage
    • 控制雪崩光电二极管偏置电压
    • US07593651B2
    • 2009-09-22
    • US10506920
    • 2003-03-11
    • Peter NichollsGraham Butler
    • Peter NichollsGraham Butler
    • H04B10/06
    • H01L31/107H04B10/07953H04B10/0799
    • An optical communications system using forward error correction (FEC) to correct errors in signals carried by the system. Optical signals on the system are dropped at nodes and converted to electrical signals by avalanche photodiodes (APDs) at the node receivers. An FEC chip operates on the electrical signal to correct errors. The error rate is used to control the APD bias voltage which affects signal noise and therefore error rate. The errors in a predetermined interval are counted and a determination made as to whether the error rate is rising with time. The bias voltage is derived from the value of a counter whose count is incremented each interval. If the error rate is rising, the counting direction is changed.
    • 一种使用前向纠错(FEC)来纠正由系统携带的信号中的错误的光通信系统。 系统上的光信号在节点处丢弃,并通过节点接收器处的雪崩光电二极管(APD)转换为电信号。 FEC芯片对电信号进行操作以校正错误。 误差率用于控制影响信号噪声并因此影响误差率的APD偏置电压。 对预定间隔中的错误进行计数,并确定错误率是否随时间而上升。 偏置电压是从每个间隔增加计数器的值导出的。 如果错误率上升,计数方向改变。