On-Chip Sensing System Employing Wavelength Splitting for Noise Suppression

In this work, we present a novel refractive index (RI) sensing system capable of suppressing optical phase errors (noise). Phase errors, for instance, due to process and temperature variations, limit the sensor's accuracy and limit-of-detection (LoD). The proposed system uses four loop-terminated Mach-Zehnder Interferometers (LT-MZI) to achieve wavelength splitting. LT-MZI allows us to tune the output spectrum using its directional coupler …