[1] Liu Y F, Chen Y, Wang L et al. Tunable and reconfigurable microwave photonic bandpass filter based on cascaded silicon microring resonators[J]. Journal of Lightwave Technology, 40, 4655-4662(2022).

[2] Yu B, Chen Y C, Pan J S et al. Silica-microsphere-cavity-based microwave photonic Notch filter with ultra-narrow bandwidth and high peak rejection[J]. Optics Letters, 44, 1411-1414(2019).

[3] Xu E M, Li F, Zhang Z X et al. Microwave photonic filter with switched single and dual passbands[J]. Acta Optica Sinica, 39, 0506003(2019).

[4] Song Z X, Wang Y P, Cheng Y J. Demodulation of a polarization-maintaining photonic crystal fiber load sensor with high resolution using a microwave photonic filter[J]. Microwave and Optical Technology Letters, 63, 1612-1615(2021).

[5] Fu H Y, Zhang W, Mou C B et al. High-frequency fiber Bragg grating sensing interrogation system using Sagnac-loop-based microwave photonic filtering[J]. IEEE Photonics Technology Letters, 21, 519-521(2009).

[6] Zhang Z P, Niu X C, Huang J et al. High-performance microwave photonic filter based on fiber ring resonator[J]. Acta Optica Sinica, 40, 2106001(2020).

[7] Lai M B, Geng M M, Tan Y X et al. Optical filter design based on cascaded double-ring-assisted Mach-Zehnder interferometers with bandwidth tuning capability[J]. Acta Optica Sinica, 43, 1113003(2023).

[8] Deng H, Zhang W F, Yao J P. High-speed and high-resolution interrogation of a silicon photonic microdisk sensor based on microwave photonic filtering[J]. Journal of Lightwave Technology, 36, 4243-4249(2018).

[9] Yang H M, Li J, Zheng P F et al. A stopband and passband switchable microwave photonic filter based on integrated dual ring coupled Mach-Zehnder interferometer[J]. IEEE Photonics Journal, 11, 5502608(2019).

[10] Chen Y, Fan Z Q, Lin Y et al. A multiband microwave photonic filter based on a strongly coupled microring resonator with adjustable bandwidth[J]. IEEE Photonics Journal, 15, 5500206(2023).

[11] Liu Y, Hotten J, Choudhary A et al. All-optimized integrated RF photonic Notch filter[J]. Optics Letters, 42, 4631-4634(2017).

[12] Zhuang L M. Flexible RF filter using a nonuniform SCISSOR[J]. Optics Letters, 41, 1118-1121(2016).

[13] Liu X L, Yu Y A, Tang H T et al. Silicon-on-insulator-based microwave photonic filter with narrowband and ultrahigh peak rejection[J]. Optics Letters, 43, 1359-1362(2018).

[14] Zhuang L M, Zhu C, Corcoran B et al. Sub-GHz-resolution C-band Nyquist-filtering interleaver on a high-index-contrast photonic integrated circuit[J]. Optics Express, 24, 5715-5727(2016).

[15] Qiu H Q, Zhou F, Qie J R et al. A continuously tunable sub-gigahertz microwave photonic bandpass filter based on an ultra-high-Q silicon microring resonator[J]. Journal of Lightwave Technology, 36, 4312-4318(2018).

[16] Zhang L, Jie L L, Zhang M et al. Ultrahigh-Q silicon racetrack resonators[J]. Photonics Research, 8, 684-689(2020).

[17] Ji X C, Jang J K, Dave U D et al. Exploiting ultralow loss multimode waveguides for broadband frequency combs[J]. Laser & Photonics Reviews, 15, 2000353(2021).

[18] Xu L, Hou J E, Tang H T et al. Silicon-on-insulator-based microwave photonic filter with widely adjustable bandwidth[J]. Photonics Research, 7, 110-115(2019).

[19] Ma C S, Xu Y Z, Yan X et al. Optimization and analysis of series-coupled microring resonator arrays[J]. Optics Communications, 262, 41-46(2006).