Optical network unit registration method for wavelength-selected wavelength division multiplexing passive optical network

A method of communication, comprising:

• sending, by an optical line terminal (OLT), to an optical network unit (ONU), a discovery message for registration through a specific downstream wavelength;
• receiving, by the OLT, a registration request from the ONU through a specific upstream wavelength;
• assigning, by the OLT, out of a plurality of normal service upstream wavelengths and a plurality of normal service downstream wavelengths, a normal service upstream wavelength and a normal service downstream wavelength to the ONU;
• sending, through the specific downstream wavelength to the ONU, a confirmation that the OLT has received the registration request,
• wherein the specific downstream and upstream wavelengths are reserved for a registration process that includes receiving, through the specific upstream wavelength, the registration request and sending, through the specific downstream wavelength, a discovery window message and information regarding the normal service upstream wavelength and the normal service downstream wavelength;
• and
• replacing the one or both of the specific downstream wavelength and the specific upstream wavelength with one or both of a normal service downstream wavelength and a normal service upstream wavelength, respectively, when the one or both of the specific downstream wavelength and the specific upstream wavelength for the registration process fails.

A method of communication, comprising:

• sending, by an optical line terminal (OLT), to an optical network unit (ONU), a discovery message for registration through a specific downstream wavelength;
• receiving, by the OLT, a registration request from the ONU through a specific upstream wavelength;
• assigning, by the OLT, out of a plurality of normal service upstream wavelengths and a plurality of normal service downstream wavelengths, a normal service upstream wavelength and a normal service downstream wavelength to the ONU;
• sending, through the specific downstream wavelength to the ONU, a confirmation that the OLT has received the registration request,
• wherein the specific downstream and upstream wavelengths are reserved for a registration process that includes receiving, through the specific upstream wavelength, the registration request and sending, through the specific downstream wavelength, a discovery window message and information regarding the normal service upstream wavelength and the normal service downstream wavelength;
• and
• periodically receiving, at the OLT, status information from the ONU, after assigning the normal service upstream wavelength and the normal service downstream wavelength to the ONU,
• wherein the OLT marks the normal service upstream wavelength and the normal service downstream wavelength occupied by the ONU as unoccupied if the OLT fails to receive any status information from the ONU and releases the normal service upstream wavelength and the normal service downstream wavelength to a wavelength resource pool.

A method of communication, comprising:

• tuning an optical network unit (ONU) to a specific downstream wavelength and a specific upstream wavelength;
• sending, by the ONU, a registration request to an optical line terminal (OLT) through the specific upstream wavelength;
• receiving, by the ONU, a registration confirmation message that the OLT has received the registration request;
• and
• configuring the ONU to a normal service upstream wavelength and a normal service downstream wavelength,
• wherein the specific downstream and upstream wavelengths are reserved for a registration process including sending, through the specific upstream wavelength, the registration request and receiving, through the specific downstream wavelength, the registration confirmation;
• reserving the specific downstream wavelength and the specific upstream wavelength for the registration process;
• and
• assigning, after assigning all of the plurality of normal service upstream wavelengths to ONUs, the specific upstream wavelength as a normal service upstream wavelength, or assigning, after assigning all normal service downstream wavelengths to ONUs, the specific downstream wavelength as a normal service downstream wavelength, or assigning, after assigning all of the plurality of normal upstream and downstream wavelengths to ONUs, the specific upstream and downstream wavelengths as normal service upstream and downstream wavelengths.

An optical transceiver apparatus, comprising:

• an I/O interface communicatively coupled via an optical transmission medium to another optical transceiver apparatus;
• a memory to store executable instructions;
• and
• a processor in communication with the memory, configured to read the executable instructions from the memory to:
• send, by an optical line terminal (OLT), to an optical network unit (ONU), a discovery window message for registration through a specific downstream wavelength;
• receive, by the OLT, a registration request from the ONU through a specific upstream wavelength;
• assign, by the OLT, out of a plurality of normal service upstream wavelengths and a plurality of normal service downstream wavelengths in a wavelength resource pool, a normal service upstream wavelength and a normal service downstream wavelength to the ONU for a normal service between the ONU and the OLT;
• and
• sending, through the specific downstream wavelength to the ONU, a confirmation that the OLT has received the registration request,
• wherein the specific downstream and upstream wavelengths are reserved for a registration process including receiving, through the specific upstream wavelength, the registration request and sending, through the specific downstream wavelength, information regarding the assigned normal service upstream wavelength and the assigned normal service downstream wavelength.