A nested ring resonator structure has been devised on a silicon-on-insulator platform, incorporating a feedback path through the addition of a port to the device. This design selectively enhances resonant wavelengths while effectively suppressing numerous consecutive resonant wavelengths by ∼30 dB. Consequently, it significantly expands the free spectral range (FSR) by over 85 nm, exceeding 20 times the FSR achieved without the feedback path. The resonant peak wavelength can be tuned by ∼40 nm/μm change in the feedback path, offering a broader range for refractive index sensing. The impact of the additional phase control parameter length in the feedback path was investigated. Theoretical analysis was followed by finite differential time domain simulations to validate the results. Various device parameters were systematically adjusted to observe a substantial increase in the FSR and improved controllability over peak transmission.
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