SOI-Based 12 × 12 Arrayed Waveguide Grating for Fiber Bragg Grating Interrogation System

Abstract Fiber Bragg grating (FBG) interrogator is a scientific instrument that can indirectly monitor physical quantities such as temperature and pressure by detecting the center wavelength of FBG. The arrayed waveguide grating (AWG), one of the fundamental parts of the FBG interrogation system, is essential for driving the downsizing of the system and high-speed rate. In this paper, a 12-channel silicon on insulator based AWG with an average 3 dB bandwidth of 2.23 nm , insertion loss of less than 5 dB, and crosstalk of −16.64 dB is designed and fabricated for a photonic integrated FBG interrogation system. The wavelength resolution of the FBG interrogation system of this AWG is 8 pm , and the wavelength accuracy measured in the dynamic range of 0.8 nm is 10.59 pm . This AWG can be well used in FBG interrogation systems.