Communication method applied to multi-wavelength passive optical network, apparatus, and system

An optical network unit (ONU), wherein the ONU comprises at least a first port and a second port, and the ONU comprises:

• the first port, configured to:
• receive a wavelength switching request message delivered by an Optical Line Terminal (OLT), wherein the wavelength switching request message carries second wavelength channel information and port information that is of the second port;
• and send the wavelength switching request message to a processor;
• the second port, configured to receive the wavelength switching request message delivered by the OLT, wherein the wavelength switching request message carries the second wavelength information and the port information that is of the second port;
• and/or configured to perform a redundancy backup of the ONU;
• and
• the processor connected to the first port and the second port, configured to:
• switch an operating wavelength of an optical module corresponding to the second port of the ONU from a first wavelength channel to a second wavelength channel corresponding to the second wavelength channel information;
• and generate a wavelength switching complete message and transmit the wavelength switching complete message to the first port;
• wherein
• the first port is further configured to send the wavelength switching complete message to the OLT.

A multi-wavelength passive optical network system, wherein the multi-wavelength passive optical network system comprises an optical line terminal (OLT) and at least one optical network unit (ONU), the ONU comprises at least a first port and a second port, the first port and the second port work on a first wavelength, and wherein the ONU comprises at least a first port and a second port, and the ONU comprises:

• the first port, configured to:
• receive a wavelength switching request message delivered by an Optical Line Terminal, OLT, wherein the wavelength switching request message carries second wavelength channel information and port information that is of the second port;
• and send the wavelength switching request message to a processor;
• the second port, configured to receive the wavelength switching request message delivered by the OLT, wherein the wavelength switching request message carries the second wavelength information and the port information that is of the second port;
• and/or configured to perform a redundancy backup of the ONU;
• and
• the processor connected to the first port and the second port, configured to:
• switch an operating wavelength of an optical module corresponding to the second port of the ONU from a first wavelength channel to a second wavelength channel corresponding to the second wavelength channel information;
• and generate a wavelength switching complete message and transmit the wavelength switching complete message to the first port;
• wherein
• the first port is further configured to send the wavelength switching complete message to the OLT.