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为了满足光纤射频链路和相位阵列天线应用要求,提出并实验验证了基于半导体光放大器(SOA)的全光微波滤波器,该结构利用SOA的放大自发辐射的交叉增益调制(XGM)原理,可以实现通带和阻带的相互切换。它是基于由SOA和可调谐窄带光学滤波器构成的光纤延时环,利用SOA的放大自发辐射谱的交叉增益调制产生负系数。当可调谐窄带光学滤波器的中心波长对准激光器的波长时,可获得一个高Q的带通滤波器频率响应;当可调谐窄带光学滤波器的中心波长偏离激光器波长一定量时,可获得陷波宽度较窄和通带相对较平的陷波滤波器频率响应。此结构通过调节可调谐窄带滤波器的中心波长可实现高Q与通带相对较平的陷波频率响应的切换。
In order to meet the application requirements of optical fiber RF link and phase array antenna, an all-optical microwave filter based on semiconductor optical amplifier (SOA) is proposed and experimentally verified. The structure utilizes the principle of cross-gain modulation (XGM) of SOA to amplify spontaneous emission, To achieve the passband and stopband switching. It is based on a fiber delay loop made up of SOA and tunable narrowband optical filters that generates negative coefficients using the cross-gain modulation of the SOA’s amplified spontaneous emission spectrum. When the center wavelength of the tunable narrow-band optical filter is aligned with the wavelength of the laser, a high Q band-pass filter frequency response is obtained; when the center wavelength of the tunable narrow-band optical filter deviates from the laser wavelength by a certain amount, Narrow wave width and passband relatively flat notch filter frequency response. This structure can be achieved by adjusting the center wavelength tunable narrowband filter can be relatively high passband passband notch frequency response switching.