A high dynamic range acousto optic detector is demonstrated. The device have the capabilities for channelized detection of the amplitude, frequency, and phase of wideband rf signals and thus the capability to perform interferometric rf spectral analysis with significantly improved performances over the conventional AO Bragg cells. The device have provide dynamic range of 55 dB above tangential sensitivity, at the bandwidth of 20 MHz centered at 140 MHz at the optical wavelength of 0.6328 μm, the optical power of 1.0 mW, and the drive power of 50 mW/rf signal input. Two RF singnals of equal strengths and with frequencies f 1 and f 2 were applied simultaneously to the signal Bragg cell, the device dmonstrated dynamic range of 50 dB and frequency resilution of 10 kHz.