Broadband frequency measurement system based on dynamic wavelength tuning synergistically combined with stimulated...

This paper proposes and validates a broadband frequency measurement system based on dynamic wavelength tuning synergistically combined with stimulated Brillouin scattering (SBS). By integrating a laser wavelength tuning mechanism with dynamic matching of the Brillouin gain spectrum, a frequency-to-time mapping approach is implemented to achieve microwave frequency measurement covering 9-40 GHz. The root mean square error of the proposed method is experimentally validated to be 20 MHz. The system employs a low-frequency arbitrary waveform generator (AWG) to drive laser wavelength tuning, directly generating a 31 GHz bandwidth swept-frequency signal in the optical domain. Experimental results demonstrate that the system supports both single- and two-tone signal detection and realizes measurement range reconfiguration by adjusting local oscillator frequency. Compared with conventional schemes, this architecture achieves significant breakthroughs in measurement bandwidth, system cost, and reconfigurability, providing a novel, to the best of our knowledge, approach for broadband radio frequency detection.