Parallel Sensing With Multiple Microrings on a Single Bus Waveguide

We present a multiple microrings channel integrated chip and develop a signal processing method that enables parallel sensing with this chip. We utilize fast Fourier transform (FFT) and inverse fast Fourier transform (IFFT) to extract signals from different rings with different free spectra ranges (FSR). We verify this algorithm with temperature and solution sensing experiments. Compared with the conventional single-ring-single-resonance method, it shows improvements in up to 8 multi-channels capability and higher time resolution with the same experimental hardware.