A system for fiber-optic time frequency and data joint transmission, comprising:
- a local end, the local end comprising a local time frequency signal unit, a local optical supervisory signal transmitting unit, a local optical communication data unit, a local OSC-band wavelength multiplexer/demultiplexer, and a local wavelength multiplexer/demultiplexer;
- a relay section formed by n number of relay nodes that are connected in series through optical fibers, and
- a remote end,
- wherein n is an integer that equals to or is greater than 0;
- the local end is connected to a first relay node through a first optical fiber, and the n-th relay node is connected to the remote end through a second optical fiber;
- the local time frequency signal unit is connected to a demultiplexing port (2) of the local OSC-band wavelength multiplexer/demultiplexer, the local optical supervisory signal transmitting unit is connected to a demultiplexing port (1) of the local OSC-band wavelength multiplexer/demultiplexer, a multiplexing port (3) of the OSC-band wavelength multiplexer/demultiplexer is connected to a demultiplexing port (3) of the local wavelength multiplexer/demultiplexer, the local optical communication data unit is connected to a demultiplexing port (2) of the local wavelength multiplexer/demultiplexer, and the multiplexing port (3) of the local wavelength multiplexer/demultiplexer is connected to one end of the first optical fiber;
- each relay node comprises a first wavelength multiplexer/demultiplexer, a communication data relay amplification unit, a first OSC-band wavelength multiplexer/demultiplexer, a time frequency bidirectional relay amplification unit, an optical supervisory signal receiving unit, an optical supervisory signal transmitting unit, a second OSC-band wavelength multiplexer/demultiplexer, and a second wavelength multiplexer/demultiplexer;
- a multiplexing port (3) of the first wavelength multiplexer/demultiplexer is connected to the other end of the first optical fiber, a demultiplexing port (2) of the first wavelength multiplexer/demultiplexer is connected to a port (1) of the communication data relay amplification unit, a demultiplexing port (1) of the first wavelength multiplexer/demultiplexer is connected to a multiplexing port (3) of the first OSC-band wavelength multiplexer/demultiplexer, a demultiplexing port (2) of the first OSC-band wavelength multiplexer/demultiplexer is connected to the optical supervisory signal receiving unit, and a demultiplexing port (1) of the first OSC-band wavelength multiplexer/demultiplexer is connected to a port 1 of the time frequency bidirectional relay amplification unit;
- a port (2) of the time frequency bidirectional relay amplification unit is connected to a demultiplexing port (2) of the second OSC-band wavelength multiplexer/demultiplexer, the optical supervisory signal transmitting unit is connected to a demultiplexing port (1) of the second OSC-band wavelength multiplexer/demultiplexer, a multiplexing port (3) of the second OSC-band wavelength multiplexer/demultiplexer is connected to a demultiplexing port (1) of the second wavelength multiplexer/demultiplexer, a port (2) of the communication data relay amplification unit is connected to a demultiplexing port (2) of the wavelength multiplexer/demultiplexer, and a multiplexing port (3) of the second wavelength multiplexer/demultiplexer is connected to the multiplexing port (3) of the first wavelength multiplexer/demultiplexer at a next relay node through an optical fiber;
- the n relay amplification nodes of the relay section are connected cascadedly through optical fibers;
- and the multiplexing port (3) of the second wavelength multiplexer/demultiplexer of the n-th relay node is connected to the second optical fiber;
- the remote end comprises a remote time frequency signal unit, a remote optical supervisory signal receiving unit, a remote communication data unit, a remote OSC-band wavelength multiplexer/demultiplexer and a remote wavelength multiplexer/demultiplexer, wherein the remote time frequency signal unit is connected to a demultiplexing port (1) of the remote OSC-band wavelength multiplexer/demultiplexer, the remote optical supervisory signal receiving unit is connected to a demultiplexing port (2) of the remote OSC-band wavelength multiplexer/demultiplexer, a multiplexing port (3) of the remote OSC-band wavelength multiplexer/demultiplexer is connected to a demultiplexing port (1) of the remote wavelength multiplexer/demultiplexer, the remote communication data unit is connected to a demultiplexing port (2) of the remote wavelength multiplexer/demultiplexer, and a multiplexing port (3) of the remote wavelength multiplexer/demultiplexer is connected to the other end of the second optical fiber,
- an OSC band adopted by the system is a selectable OSC band;
- and the local OSC-band wavelength multiplexer/demultiplexer, the first OSC-band wavelength multiplexer/demultiplexer, the second OSC-band wavelength multiplexer/demultiplexer, and the remote OSC-band wavelength multiplexer/demultiplexer operate in the selected OSC band for multiplexing/demultiplexing of a wavelength of an optical supervisory signal and a wavelength of a time frequency transfer signal;
- and
- wherein the wavelength of the time frequency transfer signal and the wavelength of the optical supervisory signal adopted by the system are both in the OSC band and within non-overlapped wavelength ranges.