| 摘要 |
PURPOSE:To realize stable large capacity optical communication with high accuracy by realizing a modulation and demodulation characteristic with a high efficiency. CONSTITUTION:A modulator 10 modulates directly an incident light based on a spread spectrum modulation signal, and the modulated transmission light is sent from a sender side by an optical antenna 12 through space propagation, the transmission light propagate through space is received by a receiver optical antenna 13, and the light is synthesized with a local light, a photodetector 16 applies heterodyne detection to the synthesized light to generate an RF signal, and a conjugation filter 17 compresses and demodulates a spread spectrum modulation signal based on the RF signal. |
