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Integrated optical filter based on microring resonators plays a critical rolein many applications, ranging from wavelength division multiplexing andswitching to channel routing. Bandwidth tunable filters are capable of meetingthe on-demand flexible operations in complex situations, due to theiradvantages of scalability, multi-function, and energy-saving. It has beeninvestigated recently that parity-time (PT) symmetry coupled-resonant systemscan be applied to the bandwidth-tunable filters. However, due to the trade-offbetween the bandwidth-tunable contrast ratio and insertion loss of system, thebandwidth-tunable contrast ratio of this method is severely limited. Here, thebandwidth-tunable contrast ratio is defined as the maximum bandwidth divided bythe minimum bandwidth. In this work, we show that high bandwidth-tunablecontrast ratio and low insertion loss of system can be achieved simultaneouslyby increasing the coupling strength between the input port and the resonant.System characterizations under different coupling states reveal that the lowinsertion loss can be obtained when the system initially operates at theover-coupling condition. A high bandwidth-tunable contrast ratio PT-symmetryband-pass filter with moderate insertion loss is shown on the Silicon platform.Our scheme provides an effective method to reduce the insertion loss of on-chiptunable filters, which is also applicable to the high-order cascaded microringsystems.

Design optimization of band-pass filter based on parity-time symmetry coupled-resonant