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An ultra-compact, polarization-independent, dual-channel wavelength demultiplexer is designed by the inverse method with a footprint of 2.5µm × 2.5µm. The topology optimization-based inverse design method is used for designing the device. It is designed on the CMOS-compatible silicon on Insulator (SOI) platform. The peak transmission obtained for quasi-TE polarization at 1310nm and 1550nm is approx -1.0 dB and -1.7 dB respectively and for quasi-TM polarization at 1310 nm and 1550 nm is approx -1.0 dB and -1.9 dB respectively.

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We investigate the reconfigurable resonator based on five times self-coupled photonic waveguide for versatile functionalities. These include a high-performance notch filter, bandpass filters of Bessel and Chebyshev types with improved shape factors, extinction ratio (ER) of more than 40 dB, high Q-factors, tunable ultra-high sharp Fano resonances with slope rates exceeding 1000 dB/nm and high ERs, the optical analog of multi-band electromagnetically induced transparencies, and tunable true-time delay lines with a considerable delay range.

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