| 摘要 |
PROBLEM TO BE SOLVED: To provide a method for compensating distortion of waveform due to nonlinear effect of an optical fiber, i.e., an optical transmission path, effectively by utilizing the optical phase conjugate signal pair at the time of optical up-convert or down-convert, and to provide a device for achieving that method.SOLUTION: In an emission device 25, an optical modulator 11 outputs a phase conjugate signal pair including an upper side band wave and a lower side band wave. A signal source 13 outputs a modulation signal and a bias signal applied to the optical modulator. An optical fiber 15 receives and propagates optical signals, i.e., a phase conjugate signal pair including the upper side band wave and the lower side band wave, simultaneously. A multiplexing section 17 multiplexes the phase conjugate signal pair and an external optical signal. A multiplexing local signal source 19 multiplexes an optical signal, having the same frequency as the optical carrier wave, to the upper side band wave and the lower side band wave via the multiplexing section, in a state where there is no phase difference between the upper side band wave and the lower side band wave. A photodetector 21 detects the multiplexed optical signal. A transmission antenna 23 receives an electric signal based on the optical signal, and releases as a wireless signal.SELECTED DRAWING: Figure 1 |
