Wavelength division and time division multiplex mixing passive optical network system, terminal and signal transmission method

A subscriber all-optical wavelength conversion unit, comprising;

• a subscriber wavelength division multiplexer, at least two subscriber optical wavelength converters and at least two subscriber 3-port wavelength division multiplexers, wherein;
• a downlink multiplexing port of each subscriber 3-port wavelength division multiplexer respectively connects with a downlink demultiplexing port of the subscriber wavelength division multiplexer;
• an uplink demultiplexing port of each subscriber 3-port wavelength division multiplexer respectively connects with an input port of a respective subscriber optical wavelength converter;
• p1 an output port of each subscriber optical wavelength converter connects with an uplink multiplexing port of the subscriber wavelength division multiplexer;
• and
• a third port of each subscriber 3-port wavelength division multiplexer is configured to connect with an optical coupler respectively;
• and wherein:
• the subscriber 3-port wavelength division multiplexers are configured to respectively demultiplex and multiplex optical signals with different wavelengths in uplink and downlink directions;
• and
• the subscriber optical wavelength converters are configured to convert uplink optical signals with a same wavelength emitted by optical network units and received from the subscriber 3-port wavelength division multiplexers into the optical signals with different wavelengths, and to send the optical signals with different wavelengths to the subscriber wavelength division multiplexer for multiplexing.

An optical line terminal, comprising at least two optical modules and an office all-optical wavelength conversion unit, wherein:

• the optical modules are configured to generate optical signals with a same wavelength in a downlink direction, and to send the optical signals with the same wavelength to the office all-optical wavelength conversion unit;
• and
• the office all-optical wavelength conversion unit is configured to convert the optical signals with the same wavelength into optical signals with different wavelengths in the downlink direction, to multiplex the optical signals with different wavelengths in an uplink direction, and then to send the uplink optical signals to the optical modules at an optical line terminal side for reception;
• and wherein:
• the office all-optical wavelength conversion unit comprises at least two office 3-port wavelength division multiplexers, at least two office optical wavelength converters and an office wavelength division multiplexer, wherein;
• an uplink multiplexing port of each office 3-port wavelength division multiplexer respectively connects with an uplink demultiplexing port of the office wavelength division multiplexer;
• a downlink demultiplexing port of each office 3-port wavelength division multiplexer respectively connects with an input port of a respective office optical wavelength converter;
• an output port of each office optical wavelength converter connects with a downlink multiplexing port of the office wavelength division multiplexer;
• and
• a third port of each office 3-port wavelength division multiplexer connects with an optical module respectively;
• the office 3-port wavelength division multiplexers respectively multiplex and demultiplex the optical signals with different wavelengths in uplink and downlink directions;
• and
• the office optical wavelength converters convert downlink optical signals with the same wavelength emitted by the optical modules and received from the office 3-port wavelength division multiplexers into optical signals with different wavelengths, and send the optical signals with different wavelengths to the office wavelength division multiplexer for multiplexing.