Data transmission method, apparatus, and system

A data transmission method, comprising:

• receiving a first optical signal from an input port;
• converting, according to a correspondence between an input port of an optical signal and a mode group, the received first optical signal into a second optical signal in one or more modes in a mode group corresponding to the input port;
• and
• multiplexing the second optical signal to a multimode optical fiber for transmission.

A data transmission method, comprising:

• receiving a second optical signal;
• determining a mode group to which the second optical signal belongs;
• and
• outputting, according to a correspondence between an output port and a mode group, the received second optical signal from a corresponding output port.

A mode multiplexer, comprising:

• a first port processing unit, configured to:
• receive a first optical signal from an input port;
• a first processor, configured to:
• convert, according to a correspondence between an input port of an optical signal and a mode group, the received first optical signal into a second optical signal in one or more modes in a mode group corresponding to the input port, and
• instruct the first port processing unit to multiplex the second optical signal to a multimode optical fiber for transmission;
• and
• wherein the first port processing unit is further configured to:
• multiplex, according to an instruction from the first processor, the second optical signal to a multimode optical fiber for transmission.

A mode demultiplexer, comprising:

• a second port processing unit, configured to:
• receive a second optical signal;
• a second processor, configured to:
• determine a mode group to which the received second optical signal belongs,
• obtain, according to a correspondence between an output port and a mode group, the output port corresponding to the received second optical signal, and
• instruct the second port processing unit to output the received second optical signal from the corresponding output port;
• and
• wherein the second port processing unit is further configured to:
• output, according to an instruction from the second processor, the received second optical signal from a corresponding output port.