| Citation: | YOU Ya-jun, XU Xin, WANG Lin-yi, FENG Liu-yan, LIU Yi, GENG Wen-ping, HE Wen-jun. Tunable narrowband microwave photonic filter based on brillouin fiber oscillator[J]. Chinese Optics, 2022, 15(4): 660-667. doi: 10.37188/CO.2022-0057
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In order to make sure a microwave photonic filter both have wide tuning range and high frequency selectivity, a microwave photonic filter with a wide tuning range and narrow filter bandwidth based on a Brillouin oscillator is proposed and verified for the first time. The core of the filter is a Brillouin fiber oscillator with a cavity length of 10 m, and the stimulated Brillouin scattering pump and optical carrier signal are provided by two different tunable lasers. After the Brillouin gain spectrum interacts with the optical modulation sideband, the Brillouin fiber oscillator is used to narrow the spectral linewidth to realize narrowband microwave photonic filtering. By changing the pump wavelength, the filter passband can be tuned stably. The experimental results show that the microwave photonic filter can be stably tuned in the frequency range of 0−20 GHz. The out-of-band rejection ratio is found to be about 20 dB, and its 3-dB bandwidth and maximum
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