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 (SOI) 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.

Rapid measurement method for key dimensions of train wheelset based on improved image processing algorithm

“…Linear laser structured light is widely used in threedimensional measurement and scanning for its high precision and fast measurement speed [30]. In the online laser structured light system, the calibration process of the whole system is mainly divided into camera internal and external parameter calibration and linear laser plane calibration [31].…”