Method, Apparatus, and System for Processing Optical Network Signal

A method for processing an optical network signal, comprising:

• receiving an optical signal sent by an optical network unit;
• outputting one polarization component correspondingly from a first polarization port and outputting another polarization component correspondingly from a second polarization port, wherein the first polarization port is configured to, when downlink data is being sent to the optical network unit, input a polarization component on which the downlink data is modulated, and the second polarization port is configured to, when the downlink data is being sent to the optical network unit, input a polarization component on which no downlink data is modulated;
• and
• demodulating uplink data from the polarization component output from the first polarization port and isolating the polarization component output from the second polarization port.

An optical network unit, comprising:

• an optical signal transceiver, a downlink data processing module, and an uplink data processing module, wherein:
• the optical signal transceiver is configured to receive an optical signal sent by an optical line terminal, wherein the optical signal comprises two polarization components perpendicular to each other, and downlink data is modulated on one of the polarization components;
• divide the optical signal into one optical signal and an other optical signal, wherein each of the one optical signal and the other signal is the same as the received optical signal;
• send the one optical signal to the downlink data processing module;
• send the other optical signal to the uplink data processing module;
• and send the optical signal sent by the uplink data processing module to the optical line terminal;
• the downlink data processing module is configured to demodulate the downlink data from the received optical signal;
• and
• the uplink data processing module is configured to perform, for the received optical signal, vertical polarization rotation processing and processing of modulating uplink data onto two polarization components of the received optical signal, and send the optical signal on which the vertical polarization rotation processing and the uplink data modulation processing are performed to the optical signal transceiver, so that the optical signal transceiver sends the optical signal to the optical line terminal.

An optical line terminal, comprising:

• a polarization beam combiner, an uplink data processing module, and an optical isolator, wherein:
• the polarization beam combiner is configured to receive an optical signal sent by an optical network unit, output one polarization component correspondingly from a first polarization port, and output another polarization component correspondingly from a second polarization port, wherein the first polarization port is configured to, when downlink data is being sent to the optical network unit, input a polarization components on which the downlink data is modulated, and the second polarization port is configured to, when the downlink data is being sent to the optical network unit, input a polarization component on which no downlink data is modulated;
• the uplink data processing module is configured to demodulate an uplink data from the polarization component output from the first polarization port;
• and
• the optical isolator is configured to isolate the polarization component output from the second polarization port.