Wei Wei, Yi Lilin, Jaouën Yves, Hu Weisheng
Opt Lett. 2017 Oct 15;42(20):4083-4086. doi: 10.1364/OL.42.004083.
We present a cost-effective gigahertz-wide arbitrary-shaped microwave photonic filter based on stimulated Brillouin scattering in fiber using a directly modulated laser (DML). After analyzing the relationship between the spectral power density and the modulation current of the DML, we manage to precisely adjust the optical spectrum of the DML, thereby controlling the Brillouin filter response arbitrarily for the first time, to the best of our knowledge. The filter performance is evaluated by amplifying a 500 Mb/s non-return-to-zero on-off keying signal using a 1 GHz rectangular filter. The comparison between the proposed DML approach and the previous approach adopting a complex IQ modulator shows similar filter flexibility, shape fidelity, and noise performance, proving that the DML-based Brillouin filter technique is a cost-effective and valid solution for microwave photonic applications.
我们展示了一种基于光纤中受激布里渊散射的具有成本效益的千兆赫兹宽任意形状微波光子滤波器，该滤波器使用直接调制激光器（DML）。在分析了DML的光谱功率密度与调制电流之间的关系后，据我们所知，我们首次成功精确调整了DML的光谱，从而任意控制布里渊滤波器响应。使用1GHz矩形滤波器放大500Mb/s非归零开关键控信号来评估滤波器性能。将所提出的DML方法与先前采用复杂IQ调制器的方法进行比较，结果显示出类似的滤波器灵活性、形状保真度和噪声性能，证明基于DML的布里渊滤波器技术是微波光子应用中一种具有成本效益且有效的解决方案。
