Broadband Microwave Photonic Frequency Measurement Based on Optical Spectrum Manipulation and Stimulated Brillouin Scattering

Abstract

In this paper, a broadband frequency measurement system based on optical spectrum manipulation and stimulated Brillouin scattering (SBS) is proposed and experimentally demonstrated, which can implement wide-range and high-resolution frequency measurement, and generate corresponding broadband interference signals in some frequency bands, that is, it has versatility. Since the frequency range of the pump light to excite SBS is expanded based on the optical spectrum manipulation and high resolution is ensured by the narrow scattering spectrum of SBS, high-resolution spectrum measurement covering a wide frequency band is finally implemented. In addition, the double sideband pump light can be used as the source of electronic interference signal. In the experiments, the frequency measurement range of the proposed system is tested to be 0.03-44 GHz, and the resolution is up to 3 MHz. Furthermore, the frequency measurement and electronic interference sharing the same work band can be carried out in the ranges of 6.3367-7.8367 GHz and 20.36-22.16 GHz.

High resolution frequency shift measurement based on the time domain mode-locked optoelectronic oscillator

“…However, the traditional electrical methods face detecting limitations due to such small echo signals and small Doppler shifts especially at higher frequency regions. The application of microwave photonics in radar systems present great potential in solving the higher frequency, fast speed and anti-electromagnetic interference problems faced by traditional electrical methods [1][2]. Especially, the optoelectronic oscillator (OEO) has attracted much attention in generating high-purity wideband tunable microwave signals attributing to the ultra-low loss optical fiber delay line and finds various applications in radar, sensing, signal processing and communication systems [3][4].…”