Abstract
Based on the principle of acousto-optic (AO) diffraction, the mechanism of acousto-optic deflection for frequency measurement and the noise characteristics of balanced detection in a coherent system are analyzed theoretically. For signal to noise ratio (SNR) improvement and multiple simultaneous signals parallel processing in acousto-optic signals processing environment, a test platform for frequency measurement is established to discuss the method of SNR improvement while the ability of signals detection and frequency resolution are tested. In the operational bandwidth, the system using acousto-optic effect and balanced coherent detection can improve the output SNR to some extent. Experiments have shown that a balanced coherent configuration has 5 dB improvements in output SNR over a single-detector coherent configuration, and frequency resolution of the system is less than 0.1 MHz.
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