Abstract

We demonstrate a spectrum-continuous narrowband filter based on multi-section Mach-Zehnder interferometer (MZI) structures on a silicon nitride platform. Enhanced in-band flatness and sharp out-of-band roll-off features are achieved by cascading MZIs of specific functionalities in a series. This filter is fabricated in a single chip with a total waveguide length exceeding 237 cm. We experimentally demonstrate for the first time, to the best of our knowledge, a four-channel spectrum-continuous filter with a 3 dB bandwidth of 580 MHz, a 1 dB fluctuation bandwidth as high as 356 MHz, and an excellent 20 dB roll-off factor of 1.26 that are obtained simultaneously. Both the optical and electrical experimental results show that the proposed filter can play a key role in integrated microwave photonic front-end systems.

© 2021 Optical Society of America

Ultra-narrow passband-tunable filter based on a high-Q silicon racetrack resonator

Jin Xu, Yujia Zhang, Xuhan Guo, Qingzhong Huang, Xinliang Zhang, and Yikai Su
Opt. Lett. 46(22) 5575-5578 (2021)

Silicon-on-insulator-based microwave photonic filter with narrowband and ultrahigh peak rejection

Xiaolong Liu, Yuan Yu, Haitao Tang, Lu Xu, Jianji Dong, and Xinliang Zhang
Opt. Lett. 43(6) 1359-1362 (2018)

Flat-top bandpass microwave photonic filter with tunable bandwidth and center frequency based on a Fabry–Pérot semiconductor optical amplifier

Fan Jiang, Yuan Yu, Tong Cao, Haitao Tang, Jianji Dong, and Xinliang Zhang
Opt. Lett. 41(14) 3301-3304 (2016)

Ultrahigh-Q and tunable single-passband microwave photonic filter based on stimulated Brillouin scattering and a fiber ring resonator

Hua Shun Wen, Ming Li, Wei Li, and Ning Hua Zhu
Opt. Lett. 43(19) 4659-4662 (2018)

Microwave photonic notch filter with integrated phase-to-intensity modulation transformation and optical carrier suppression

Okky Daulay, Gaojian Liu, and David Marpaung
Opt. Lett. 46(3) 488-491 (2021)