Passive optical network system, optical line terminal, and optical network unit

A method, comprising:

• sending, by an optical line terminal (OLT), a second upstream bandwidth grant to an optical network unit (ONU) on a downstream channel, wherein the second upstream bandwidth grant indicates information for the ONU to send a registration response packet on a second upstream channel;
• receiving, by the OLT, the registration response packet sent by the ONU on the second upstream channel;
• sending on the downstream channel, by the OLT, a first upstream bandwidth grant indicating information for the ONU to send a first upstream service data on a first upstream channel and a third upstream bandwidth grant indicating information for the ONU to send a second upstream service data on the second upstream channel;
• and
• receiving, by the OLT, the first upstream service data on the first upstream channel and the second upstream service data on the second upstream channel sent by the ONU;
• wherein a wavelength of the first upstream channel is not equal to a wavelength of the second upstream channel.

An optical network unit (ONU), wherein the ONU comprises:

• a downstream receiver, a first upstream burst transmitter, and a second upstream burst transmitter;
• wherein the downstream receiver is configured to receive a second upstream bandwidth grant sent by an optical line terminal (OLT) on a downstream channel, wherein the second upstream bandwidth grant indicates information for the ONU to send a registration response packet on a second upstream channel;
• wherein the second upstream burst transmitter is configured to send the registration response packet to the OLT on the second upstream channel;
• wherein the downstream receiver is further configured to receive a first upstream bandwidth grant sent by the OLT on the downstream channel, wherein the first upstream bandwidth grant indicates information for the ONU to send a first upstream service data on a first upstream channel;
• wherein the first upstream burst transmitter is configured to send the first upstream service data to the OLT on the first upstream channel;
• wherein the downstream receiver is further configured to receive a third upstream bandwidth grant indicating information for the ONU to send a second upstream service data on the second upstream channel;
• wherein the second upstream burst transmitter is further configured to send the second upstream service data to the OLT on the second upstream channel;
• and
• wherein a wavelength of the first upstream channel is not equal to a wavelength of the second upstream channel.

An optical line terminal (OLT), wherein the OLT comprises:

• a downstream transmitter, a first upstream burst receiver, and a second upstream burst receiver;
• wherein the downstream transmitter is configured to send a second upstream bandwidth grant to an optical network unit (ONU) on a downstream channel, wherein the second upstream bandwidth grant indicates information for the ONU to send a registration response packet on a second upstream channel;
• wherein the second upstream burst receiver is configured to receive the registration response packet sent by the ONU on the second upstream channel;
• wherein the downstream transmitter is further configured to send a first upstream bandwidth grant to the ONU on the downstream channel, wherein the first upstream bandwidth grant indicates information for the ONU to send a first upstream service data on a first upstream channel;
• wherein the first upstream burst receiver is configured to receive the first upstream service data on the first upstream channel;
• wherein the downstream transmitter is further configured to send a third upstream bandwidth grant indicating information for the ONU to send a second upstream service data on the second upstream channel;
• wherein the second upstream burst receiver is further configured to receive the second upstream service data on the second upstream channel sent by the ONU;
• and
• wherein a wavelength of the first upstream channel is not equal to a wavelength of the second upstream channel.

A passive optical network (PON) system, wherein the system comprises:

• an optical line terminal (OLT) and an optical network unit (ONU);
• wherein the OLT is configured to send a second upstream bandwidth grant to the ONU on a downstream channel, wherein the second upstream bandwidth grant indicates information for the ONU to send a registration response packet on a second upstream channel;
• wherein the ONU is configured to receive the second upstream bandwidth grant on the downstream channel and send the registration response packet to the OLT on the second upstream channel;
• wherein the OLT is further configured to receive the registration response packet on the second upstream channel;
• wherein the OLT is further configured to send a first upstream bandwidth grant to the ONU on the downstream channel, wherein the first upstream bandwidth grant indicates information for the ONU to send a first upstream service data on a first upstream channel, wherein a wavelength of the first upstream channel is not equal to a wavelength of the second upstream channel;
• wherein the ONU is further configured to receive the first upstream bandwidth grant on the downstream channel and send the first upstream service data to the OLT on the first upstream channel;
• wherein the OLT is further configured to receive the first upstream service data on the first upstream channel;
• wherein the OLT is further configured to send a third upstream bandwidth grant indicating information for the ONU to send a second upstream service data on the second upstream channel;
• wherein the ONU is further configured to receive the second upstream bandwidth grant on the downstream channel and send the second upstream service data to the OLT on the second upstream channel;
• and
• wherein the OLT is further configured to receive the second upstream service data on the second upstream channel sent by the ONU.