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提出了一个新的基于布里渊散射效应的微波光子滤波器。该滤波器可通过调谐系统中光滤波器的中心波长,实现高解析度带通滤波器与陷波滤波器之间的灵活切换,并且通过调谐产生受激布里渊散射的泵浦光的波长可实现滤波器通带或阻带的中心频率在很大频率范围内连续调谐。该滤波器为全光结构,因此具有非常大的调谐范围(调谐上限仅受限于试验中使用的矢量网络分析仪的显示频率上限)。系统中采用相位调制器,因此没有偏置电压漂移问题。实验结果展示了一个带通与陷波滤可灵活切换的高解析度微波光子滤波器,并且通带和阻带的中心频率在9~26.5 GHz范围内连续可调谐,其中带通滤波器的通带具有极窄3 d B带宽,约28 MHz(由光纤本身布里渊增益区线宽所决定)。
A new microwave photonic filter based on Brillouin scattering effect is proposed. The filter enables flexible switching between high resolution bandpass filters and notch filters by tuning the center wavelength of the optical filters in the system and by tuning the wavelength of the pump light that generates stimulated Brillouin scattering The center frequency of the filter passband or stopband can be tuned continuously over a wide range of frequencies. The filter is all-optical and therefore has a very large tuning range (the upper tuning limit is limited only by the upper display frequency of the vector network analyzer used in the experiment). The system uses a phase modulator, so there is no bias voltage drift problem. The experimental results show a high-resolution microwave photonic filter with bandpass and notch filters that can be switched flexibly. The center frequencies of the passband and stopband are tunable continuously in the range of 9-26.5 GHz. The bandpass filter The band has a very narrow 3 d B bandwidth, about 28 MHz (determined by the fiber’s own Brillouin gain line width).