High-performance and compact photonic crystal channel drop filter using P-shaped ring resonator

We propose and demonstrate a novel high-performance optical channel drop filter based on two-dimensional photonic crystal ring resonators with a P-shaped configuration. This innovative structure represents a significant advancement over existing designs by achieving a near-unity dropping efficiency of 99.9 % and a quality factor of 876 at a resonant wavelength of 1533.8 nm within a compact footprint of 12.75 μm × 12.75 μm. The optimized configuration introduces a CMOS-compatible fabrication process, facilitating seamless integration into next-generation photonic integrated circuits. Our design not only achieves superior performance metrics compared to previously reported structures but also addresses the critical challenges of miniaturization and fabrication simplicity. These advancements make the proposed filter particularly suited for advanced optical communication systems, including 5G/6G networks, and contribute to the ongoing development of high-efficiency, scalable photonic devices.