The invention provides a balanced photoelectric detection method and
system capable of eliminating beat interference between signals. Light carrier
waves and light OFDM signals in received SSB-OOFDM signals are separated during a partial
wave period, the light carrier
waves and the light OFDM signals are coupled again through a 3dB 2*2
optical coupler, appropriate dependency is introduced between the light carrier
waves and the light OFDM signals, photoelectric balanced detection is conducted on the
coupling output, the two paths of signals are converted into electrical signals and are subtracted in the
electric field to obtain output electric OFDM signals, the electric signals only have OFDM radio-frequency
signal parts, and no SSBI interference is introduced. According to the balanced photoelectric detection method and
system capable of eliminating beat interference between the signals, receiving of SSBI and
direct current components can be achieved, the necessity of setting
frequency band protective intervals due to the SSBI is theoretically eliminated, and the
frequency spectrum utilization efficiency of a SSB-OOFDM
system can be improved.