An adaptive microwave photonic filter with LMS algorithm

Abstract

A microwave photonic filter (MPF) with an adaptive algorithm is proposed and theoretically analyzed. The structure combines the finite impulse response (FIR) MPF with the adaptive algorithm. The FIR MPF includes variable optical attenuators (VOAs) and variable optical delay lines (VDLs). The least mean square (LMS) algorithm can calculate the weight coefficient of each tap in FIR MPF, which can influence the VOA to realize the adaptive filtering process. This adaptive MPF can extract the desired signal from noise precisely. The noise signal can be well suppressed and the signal-to-noise ratio (SNR) can be developed from 4.15 to 25.5 dB. In addition, this adaptive MPF can be suitable for a wide range of signals.

Keywords:

• Microwave photonic filter
• adaptive algorithm
• weight coefficient
• LMS

Disclosure statement

No potential conflict of interest was reported by the author(s).

Additional information

Funding

This work was supported by the National Natural Science Foundation of China [grant number 61875070]; the Science and Technology Project of Education Department of Jilin Province [grant number JJKH20190110KJ].

Notes on contributors

Yujiao Ding

Yujiao Ding received her bachelor’s degree from the College of Electronic Science and Engineering, Jilin University, Changchun, China, in 2017. She is currently working toward her Ph.D. in electronic circuits and systems at the College of Electronic Science and Engineering, Jilin University, Changchun, China. Her current research interests include microwave photonics and microwave signal processing.

Yue Wang

Yue Wang received her bachelor’s degree from the College of Electronic Science and Engineering, Jilin University, Changchun, China, in 2016. Her current research interests are optoelectronic oscillator, optical fiber sensing, ultrawideband signal, and microwave signal processing.

Yuchen Yang

Yuchen Yang will receive his master’s degree from the College of Electronic Science and Engineering, Jilin University, Changchun, China, in 2022. His current research interests include microwave photonics and Doppler shift measurement.

Cong Du

Cong Du will receive her Ph.D. from the College of Electronic Science and Engineering, Jilin University, Changchun, China, in 2022. Her current research interests are microwave photonics and ultrawideband signal.

Wei Dong

Wei Dong received her Ph.D. in microelectronics and solid-state electronics from the College of Electronic Science and Engineering, Jilin University, Changchun, China, in 2004. She is a full professor in the College of Electronic Science and Engineering, Jilin University. Her research interests include microwave photonics, optical fiber sensing, and optoelectronic oscillator.