[1] [1] Madsen C K, Zhao J H. Optical Filter Design Analysis: a Signal Processing Approach[M]. New Yk: Wily, 1999.

[4] Butt M A, Khonina S N, Kazansiy N L. A compact design of a modified Bragg grating filter based on a metal-insulator-metal waveguide for filtering and temperature sensing applications[J]. Optik, 251, 168466(2022).

[5] Liao Shasha, Bao Hang, Feng Yuting, . Ultra-Broadband tunable filter based on cascaded chirped subwavelength grating assisted contra-directional coupler[J]. Acta Optica Sinica, 42, 1405003(2022).

[6] Yang Shuangyue, Gu Yiying, Hu Jingjing, . Design of sub-wavelength ultra-narrow band filter[J]. Infrared and Laser Engineering, 49, 20200134(2020).

[7] Chen Yufang, Shen Xiao, Zhou Quan, . All-optical tunable fiber filter based on phosphate glass microspheres[J]. Chinese Journal of Lasers, 48, 0106003(2021).

[8] Tang Zhao, Zhang Junxiang, Fu Shijie, . Tunable CW all-fiber optical parametric oscillator based on the multimode interference filter[J]. Infrared and Laser Engineering, 48, 0520002(2019).

[9] Mokhtari M. Tunable optical filter design with ring resonator based Sagnac loop[J]. Optik, 242, 167068(2021).

[10] Cui Wenxiang, Zhou Xuefang, Hu Miao, . Analysis and experimental study on transmission characteristics of double Sagnac loop filter[J]. Chinese Journal of Lasers, 49, 0406006(2022).

[11] Deng Lin, Li Dezhao, Liu Zilong, et al. Tunable optical filter using second-order micro-ring resonator[J]. Chinese Physics B, 26, 024209(2017).

[12] Wang Haoyan, Dai Jincheng, Jia Hao, et al. Polarization-independent tunable optical filter with variable bandwidth based on silicon-on-insulator waveguides[J]. Nanophotonics, 7, 1469-1477(2018).

[13] Liu Dajian, Zhao Weike, Zhang Long, . High-performance passive silicon photonic waveguide devices: progress and challenges[J]. Acta Optica Sinica, 42, 1713001(2022).

[14] Zhou Hailong, Zhao Yuhe, Wang Xu, et al. Self-configuring and reconfigurable silicon photonic signal processor[J]. ACS Photonics, 7, 792-799(2020).

[15] Fandiño J S, Muñoz P, Doménech D, et al. A monolithic integrated photonic microwave filter[J]. Nature Photonics, 11, 124-129(2017).

[16] Li Jiachen, Yang Sigang, Chen Hongwei, et al. Reconfigurable rectangular filter with continuously tunable bandwidth and wavelength[J]. IEEE Photonics Journal, 12, 1-9(2020).

[17] [17] Katumba A. Energyefficient photonic neuromphic computing f telecommunication applications[D]. Chicago: Ghent University, 2019.