Photonic microwave filters with ultra-high noise rejection

• 来源期刊: 中国光学快报（英文版）
• 年，卷（期）: 2019,（3）
• 页码范围: 12-17
• 页数: 6页
• 语种: 英文
• DOI: 10.3788/COL201917.030601

摘要

As a key figure-of-merit for high-performance microwave filters,the out-of-band noise rejection is of critical importance in a wide range of applications.This paper overviews the significant advances in photonic microwave filters (PMFs) having ultra-high rejection ratios for out-of-band noise suppression over the last ten years.Typically,two types of PMFs,the bandpass and bandstop ones,are introduced with fundamental principles,detailed approaches,and then cutting-edge results for noise rejection.Ultra-high noise rejection ratios of ～80 dB and ＞60 dB have been demonstrated for single-passband and single-stopband PMFs,respectively,which are comparable with the state-of-the-art electronic filters operating in stringent conditions.These PMFs are also characterized by wide frequency coverage,low frequency-dependent loss,and strong immunity to electromagnetic interference due to the intrinsic features from the advanced photonics technology.