The gain of the APD can be controlled by the magnitude of the reverse bias voltage.
APD的增益可以由反向偏置电压的幅度来控制。
Black lines are without external bias and red lines are with and external reverse bias voltage.
黑线表示没有偏压，红线表示有一个反向偏置电压。
The Usoff and Ir are respectively the reverse bias voltage in the off-state and the reverse current through the switch.
其中Uoff在断态时的反向偏置电压，ir是流过开关的反向漏电流。
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