| 摘要 |
PROBLEM TO BE SOLVED: To provide an optical receiver with fast recovery time.SOLUTION: A receiver comprises a photodetector 250 connected between an input of a transimpedance amplifier 280 and a high voltage supply 203 providing a bias voltage to the photodetector. A high voltage supply variation sensing element 220 is connected between the high voltage supply and a current controlled current source, where an output of the current controlled source is connected to the input of the transimpedance amplifier. A current limiter 215 is connected between the high voltage supply and a high voltage source 210. The photocurrent passing through the current limiter lowers the high voltage supply and is detected by a sensing element 270. Current from the sensing element is processed at the input of the transimpedance amplifier to minimize the current into the transimpedance amplifier, and limits the saturation of the amplifier, thereby improving recovery time when a high optical power pulse enters the photodetector. |
