Wavelength negotiation method and apparatus of multi-wavelength passive optical network, and multi-wavelength passive optical network system

A wavelength negotiation apparatus of a multi-wavelength passive optical network (PON) comprising:

• an optical receiver configured to receive a wavelength status table that is broadcast by an optical line terminal (OLT) over each downstream wavelength channel of a multi-wavelength PON system, wherein the wavelength status table is used to indicate information about available wavelengths of the multi-wavelength PON system;
• a processor configured to select an upstream transmit wavelength and a downstream receive wavelength;
• an optical transmitter configured to report information about the upstream transmit wavelength and information about the downstream receive wavelength to the OLT;
• the optical transmitter further configured to report an ONU wavelength capability set to the OLT when sending a registration request or after registration succeeds;
• the optical receiver further configured to receive a wavelength status subtable in a unicast manner by the OLT when it is determined that the selected upstream transmit wavelength or downstream receive wavelength does not meet an expected wavelength requirement;
• the processor further configured to select a new upstream transmit wavelength and a new downstream receive wavelength according to the wavelength status subtable, wherein
• the wavelength status subtable comprises information about available wavelengths in transmit/receive wavelengths supported by each ONU.

A multi-wavelength passive optical network (PON) system, comprising at least one optical line terminal (OLT) and multiple optical network units (ONUs), wherein the at least one OLT is connected to the multiple ONUs in a point-to-multipoint manner by using an optical distribution network, wherein the ONUs comprise the wavelength negotiation apparatus of the multi-wavelength PON comprises:

• an optical receiver, configured to receive a wavelength status table that is broadcast by an optical line terminal OLT over each downstream wavelength channel of a multi-wavelength PON system, wherein the wavelength status table is used to indicate information about available wavelengths of the multi-wavelength PON system;
• a processor configured to select an upstream transmit wavelength and a downstream receive wavelength according to the wavelength status table;
• and
• an optical transmitter configured to report information about the upstream transmit wavelength and information about the downstream receive wavelength to the OLT;
• the optical transmitter further configured to report an ONU wavelength capability set to the OLT when sending a registration request or after registration succeeds;
• the optical receiver further configured to receive a wavelength status subtable in a unicast manner by the OLT when it is determined that the selected upstream transmit wavelength or downstream receive wavelength does not meet an expected wavelength requirement;
• the processor further configured to select a new upstream transmit wavelength and a new downstream receive wavelength according to the wavelength status subtable, wherein
• the wavelength status subtable comprises information about available wavelengths in transmit/receive wavelengths supported by each ONU.