Optical transceiver device and optical network system

An optical transceiver device, comprising an optical assembly and at least three transceiver modules, wherein

• the optical assembly has an optical fiber interface connected to an external optical fiber;
• each of the transceiver modules is configured to process an optical signal of a corresponding mode to send a downlink optical signal of the corresponding mode to the optical assembly, and receive an uplink optical signal of the corresponding mode provided from the optical assembly;
• and
• the optical assembly is configured to perform multiplex processing on the downlink optical signal received to generate a downlink multiplexed optical signal and send the downlink multiplexed optical signal to the external optical fiber, and perform demultiplex processing on an uplink multiplexed optical signal received to obtain an optical signal of the corresponding mode of at least one of the transceiver modules,
• wherein the at least three transceiver modules comprise:
• a third transceiver module configured to send a downlink optical signal of a third mode to the optical assembly and receive an uplink optical signal of the third mode provided from the optical assembly, the third mode being a low-latency mode,
• wherein in the low-latency mode, the downlink optical signal of the third mode and the uplink optical signal of the third mode have a variable frequency for transmitting packets after tan Optical Network Unit (ONU) is successfully registered.