OPTICAL TRANSMISSION ASSEMBLY

The present invention discloses an optical transmission assembly and pertains to the field of fiber-optic communications. The optical transmission assembly includes a serializer, a high-order modulation unit, a digital-analog conversion unit, and an optical transmission module. The serializer and the high-order modulation unit are electrically connected. The high-order modulation unit and the digital-analog conversion unit are electrically connected. The digital-analog conversion unit and the optical transmission module are electrically connected. The optical transmission module includes at least one transmit processing unit and at least one receive processing unit. The serializer is configured to serially combine every two of multiple electrical signals that are input into the optical transmission assembly, to obtain a serially mixed electrical signal. The high-order modulation unit is a pulse amplitude modulation four (PAM4) unit or a Discrete Multi-Tone (DMT) unit. By using the present invention, costs of an optical transmission assembly can be reduced.