Sidelobe suppression analysis of microwave photonic filter based on spectrum-shaped optical frequenc

• 作 者: 俞杨 李尚远 郑小平 张汉一 周炳琨
• 机 构: Tsinghua National Laboratory for Information Science and Technology, Department of Electronic Engine
• 出 处: Chinese Optics Letters
• 发表日期: 2016年06期
• 关键词: suppression photonic shaped microwave dispersive impulse optimizing typically sy

A finite impulse-response microwave photonic filter is typically achieved based on spectrum-shaped optical frequency combs and a dispersive element. We propose an analytical model to describe the amplitude responses of the sidelobes. The model shows that the sidelobe suppression ratio is limited by the spectrum structure of the optical combs. By taking Gaussian-profiled combs as an example, it is both theoretically and experimentally proved that the suppression ratio can be improved by optimizing the spectral power range, which is defined as the ratio of the maximum tap weight to the minimum tap weight.

A finite impulse-response microwave photonic filter is typically achieved based on spectrum-shaped optical frequency combs and a dispersive element. We propose an analytical model to describe the amplitude responses of the sidelobes. The model shows that the sidelobe suppression ratio is limited by the spectrum structure of the optical combs. By taking Gaussian-profiled combs as an example, it is both theoretically and experimentally verified that the suppression ratio can be improved by optimizing the spectral power range, which is defined as the ratio of the maximum tap weight to the minimum tap weight.