Abstract

A new cascaded microwave photonic filter that can realize a high Q value is presented. It consists of two infinite impulse response filters based on two active loops. Owing to wavelength conversion employing cross-gain modulation of the amplified spontaneous emission spectrum of the semiconductor optical amplifier in one loop, the interference between the modulated optical signals of different taps from two loops can be avoided, and stable transmission characteristics of the filter can then be achieved. Using this cascaded structure, the free spectral range and Q value can be increased significantly, and tunability can also be realized. Measured results of a high Q of 3338 and a rejection ratio of about $40\mathrm{dB}$ are achieved.

© 2010 Optical Society of America

Ultrahigh-Q microwave photonic filter with tunable Q value utilizing cascaded optical-electrical feedback loops

Jie Liu, Nan Guo, Zhaohui Li, Changyuan Yu, and Chao Lu
Opt. Lett. 38(21) 4304-4307 (2013)

High-Q cascaded single-passband microwave photonic filter based on an optical-electrical feedback loop

Ruodong Duan, Yansong Song, Tianshu Wang, Hongfei Zhu, and Lei Du
Appl. Opt. 62(7) 1667-1671 (2023)

Switchable microwave photonic filter between high Q bandpass filter and notch filter with flat passband based on phase modulation

Yuan Yu, Enming Xu, Jianji Dong, Lina Zhou, Xiang Li, and Xinliang Zhang
Opt. Express 18(24) 25271-25282 (2010)

Ultra-wideband microwave photonic filter with a high Q-factor using a semiconductor optical amplifier

Han Chen
Opt. Lett. 42(7) 1397-1400 (2017)

Wideband tunable optoelectronic oscillator based on a microwave photonic filter with an ultra-narrow passband

Haitao Tang, Yuan Yu, Ziwei Wang, Lu Xu, and Xinliang Zhang
Opt. Lett. 43(10) 2328-2331 (2018)