2020/11/12 by Hamed Arianfard, Jiayang Wu, Saulius Juodkazis +1 · 1 citation
Engineering · Materials Science · Physics and Astronomy · #Band-pass filter #Coupled mode theory #Coupling (piping) #Filter (signal processing) #Interference (communication) #Loop (graph theory) #Optical Coatings and Gratings #Optical filter #Photonic Crystals and Applications #Photonic and Optical Devices #Photonics #Q factor #Resonator #physics.optics
paper · pdf · doi:10.1109/jlt.2020.3037559
published as Journal of Lightwave Technology Vol 39 (2021) · 21 pages, 11 figures, 83 references
openalex publication_date 2020/11/12 · openalex created_date 2020/11/23 · arxiv created 2021/02/08 · arxiv updated 2021/02/09 · openalex updated_date 2026/08/05
We theoretically investigate integrated photonic resonators formed by two mutually coupled Sagnac loop reflectors (MC-SLRs). Mode interference in the MC-SLR resonators is tailored to achieve versatile filter shapes with high performance, which enable flexible spectral engineering for diverse applications. By adjusting the reflectivity of the Sagnac loop reflectors (SLRs) as well as the coupling strength between different SLRs, we achieve optical analogues of Fano resonance with ultrahigh spectral slope rates, wavelength interleaving/non-blocking switching functions with significantly enhanced filtering flatness, and compact bandpass filters with improved roll-off. In our designs the requirements for practical applications are considered, together with detailed analyses of the impact of structural parameters and fabrication tolerances. These results highlight the strong potential of MC-SLR resonators as advanced multi-functional integrated photonic filters for flexible spectral engineering in optical communications systems.