Optical differential signal sending method, apparatus and system

An optical differential signal transmission system, comprising:

• a transmit end;
• an optical transmission media;
• and
• a receive end;
• wherein the transmit end comprises:
• an optical source, configured to generate two channels of optical signals having different wavelengths, wherein the wavelengths are respectively λ1 and λ2, and λ1≠λ2;
• an input end for a to-be-modulated electrical signal, configured to input a to-be-modulated electrical signal;
• a unique optical modulator, configured to perform optical modulation separately on the two channels of optical signals having different wavelengths using the to-be-modulated electrical signal, to obtain two channels of modulated optical differential signals;
• and
• an optical transmitter, configured to send the two channels of modulated optical differential signals to the optical transmission media;
• wherein the optical transmission media is connected to the transmit end and the receive end, and is configured to transmit the two channels of modulated optical differential signals;
• and
• wherein the receive end comprises:
• an optical receiver, configured to receive the two channels of modulated optical differential signals that are transmitted by the optical transmission media;
• an optical detector, configured to perform optical-to-electrical conversion separately on the two channels of modulated optical differential signals that are received by the optical receiver, to obtain two channels of electrical signals;
• and
• a comparator, configured to perform a differential operation on the two channels of electrical signals obtained by the optical detector, to obtain a channel of electrical signal;
• and output the channel of electrical signal.