Abstract: A bi-direction optical subassembly, a combo optical module and an optical network device are provided. The bi-direction optical subassembly includes a first transmitter, a second transmitter, a first receiver, and a second receiver. A first optical transmission port, a second optical transmission port, a first optical reception port, and a second optical reception port are encapsulated in the main body. The first optical transmission port and the first optical reception port are arranged on a same side of the main body, which optimizes a structural layout and reduces the number of flexible circuit boards.

Abstract: A COMBO ONU optical module circuit is provided, including a MCU control circuit, a XGSPON ONU circuit, and a GPON ONU circuit. The MCU control circuit includes three control units. The first control unit is configured to determine a transmission channel according to a signal level. The second control unit is configured to switch between a TX_SD_10G signal and a TX_SD_1G signal. The third control unit is configured to supply power to the GPONG ONU circuit using PWR_1G control or the XGSPONG ONU circuit using PWR_10G control. The first control unit is further configured to control the XGSPON ONU circuit and the GPON ONU circuit in an I2C communication mode. Under control of the first control unit, the XGSPON ONU circuit is configured to receive and emit a 10G optical signal, and the GPON ONU circuit is configured to receive and emit a 2.5G optical signal.