Wei Wei, Yi Lilin, Jaouën Yves, Hu Weisheng
State Key Lab of Advanced Optical Communication Systems and Networks, Shanghai Jiao Tong University, 200240 Shanghai, China.
LTCI CNRS, Télécom ParisTech, Université Paris Saclay, 75013 Paris, France.
Sci Rep. 2016 Oct 19;6:35621. doi: 10.1038/srep35621.
Microwave photonic filters (MPFs) are of great interest in radio frequency systems since they provide prominent flexibility on microwave signal processing. Although filter reconfigurability and tunability have been demonstrated repeatedly, it is still difficult to control the filter shape with very high precision. Thus the MPF application is basically limited to signal selection. Here we present a polarization-insensitive single-passband arbitrary-shaped MPF with ~GHz bandwidth based on stimulated Brillouin scattering (SBS) in optical fibre. For the first time the filter shape, bandwidth and central frequency can all be precisely defined by software with ~MHz resolution. The unprecedented multi-dimensional filter flexibility offers new possibilities to process microwave signals directly in optical domain with high precision thus enhancing the MPF functionality. Nanosecond pulse shaping by implementing precisely defined filters is demonstrated to prove the filter superiority and practicability.
微波光子滤波器（MPF）在射频系统中备受关注，因为它们在微波信号处理方面具有显著的灵活性。尽管滤波器的可重构性和可调性已得到反复验证，但仍难以非常高精度地控制滤波器形状。因此，MPF的应用基本上仅限于信号选择。在此，我们展示了一种基于光纤中的受激布里渊散射（SBS）的具有约GHz带宽的偏振不敏感单通带任意形状MPF。首次可以通过软件以约MHz的分辨率精确地定义滤波器形状、带宽和中心频率。前所未有的多维滤波器灵活性为在光域中直接高精度处理微波信号提供了新的可能性，从而增强了MPF的功能。通过实现精确定义的滤波器进行纳秒脉冲整形，以证明滤波器的优越性和实用性。
