Optical receiving module

The invention relates to an optical receiver module, comprising a main optical receiver module, a reserve optical receiver module, an automatic gain control circuit and a radio frequency switch; the main optical receiver module comprises a main optical receiving element and a first front-end amplifying circuit; the reserve optical receiver module comprises a reserve optical receiving element and a second front-end amplifying circuit; the output terminal of the first front-end amplifying circuit is connected with the input terminal of a first switch of the radio frequency switch, and the output terminal of the second front-end amplifying circuit is connected with the input terminal of a second switch of the radio frequency switch; the output terminal of the radio frequency switch is connected with a first input terminal of the automatic gain control circuit; the invention is characterized in that the optical receiver module also comprises a monitoring control circuit; a second input terminal of the monitoring control circuit is connected with the output terminal of the reserve optical receiving element; a first output terminal of the monitoring control circuit is connected with a switch control input terminal of the radio frequency switch; a second output terminal of the monitoring control circuit is connected with a second input terminal of the automatic gain control circuit.