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    • 44. 发明授权
    • Optical receiver with bias voltage adjusted according to adjustable bypass current
    • 根据可调节旁路电流调整偏置电压的光接收机
    • US07326921B2
    • 2008-02-05
    • US11185964
    • 2005-07-21
    • Kengo Matsumoto
    • Kengo Matsumoto
    • H01J7/24G01J1/44H01L35/00H04B10/06
    • H01L31/02027
    • The present invention is to provide an optical receiver by which the avalanche photodiode (APD) can be protected from the self-breakdown when the signal light with excess power enters therein. The APD is biased by the DC/DC converter via the control circuit including a resistor and a variable current source connected in series to the resistor and in parallel to the APD. The resistor drops the bias voltage to the APD by the current provided from the variable current source. The controller adjusts the amount of the current flowing in the variable current source not to exceed the absolute maximum current for the APD. Accordingly, the multiplication factor of the APD is appropriately adjusted.
    • 本发明提供一种光接收器,当具有多余功率的信号光进入其中时,可以通过该光接收器防止雪崩光电二极管(APD)免于自分解。 APD由DC / DC转换器通过控制电路偏置,该控制电路包括串联连接到电阻器并与APD并联的电阻器和可变电流源。 电阻器通过从可变电流源提供的电流将偏置电压降低到APD。 控制器调节流过可变电流源的电流量不超过APD的绝对最大电流。 因此,适当地调整APD的乘法系数。