| 摘要 |
An optical receiver includes an avalanche photodiode inputting light under a bias voltage, a current monitoring unit configured to monitor a photocurrent flowing through the avalanche diode, and a control unit configured to control the bias voltage. When the magnitude of the photocurrent exceeds a specific threshold, the control unit decreases the bias voltage, and when the magnitude of the photocurrent is less than or equal to the specific threshold, the control unit keeps the bias voltage constant. The optical receiver may include a pre-amplifier disposed in series to the avalanche photodiode and configured to amplify the photocurrent. The specific threshold of the photocurrent corresponds to a dynamic range of the pre-amplifier.
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