Design of mid-infrared cascade micro-ring sensing devices using a machine learning algorithm

Abstract

An intelligent mid-infrared (mid-IR) integrated photonic device was demonstrated applying a machine learning (ML) algorithm. The design model and the estimation model of mid-IR micro-rings were trained by the artificial neural network (ANN) to create the performance-structure relationships. The sensing devices were then designed to align the micro-ring resonance with the characteristic mid-IR absorption wavelengths according to the gases of interest. Further applying the cascade micro-ring structures enables the device to monitor several gas analytes simultaneously. The ML-based mid-IR device provides a miniaturized sensing platform for remote and precise environmental monitoring.

Mid-Infrared Serial Microring Resonator Array for Real-Time Detection of Vapor-Phase Volatile Organic Compounds

“…Compared with AWG and conventional WDM, , the microring resonator array provides a more accurate spectral alignment between the sensing wavelengths and absorption lines of analytes. In addition, the number of the array’s sensing channels can be increased more than with the other platforms using the Fabry–Pérot cavities. , To further improve the sensing performance, the selection of the mid-IR sensing wavelengths will be optimized by applying numerous algorithms, including active analysis and machine learning methods. − …”

“…Another approach to create unevenly spaced resonance lines is to apply multilayer microrings. Through cascade subtraction, the frequency lines created by a primary microring are coupled into a secondary layer microring for another round of filtering before the light enters the final drop-port. − The cascade connection between the microrings enables sequential filtering and refines the frequency lines and the FSR. The advantage of the cascaded microring architecture is enhanced sensitivity for the temperature, refractive index, and chemical analyte detection due to the optical Vernier effect. − Nevertheless, the cascade filtering process may cause additional optical loss and reduce the frequency lines available in the final drop ports.…”