A VCSEL-based temperature-adaptive FBG demodulation system

Abstract

A temperature-adaptive Fiber Bragg Grating (FBG) demodulation system based on a long-wavelength Vertical-Cavity Surface Emitting laser (VCSEL) is designed to reduce power consumption and cost in this paper. The temperature-adaptive FBG system is described in detail through the sections of VCSEL characterisation and selection, selection of the methane absorption peak wavelength and matching with the laser scanning wavelength range, selection of the fiber grating wavelength and matching with the laser scanning wavelength range, and calculation of the FBG wavelength change. The experimental results show that the system has an effective scanning wavelength range of 3.7 nm in the operating environment of 10~40°C without temperature control, and it has the characteristics of low power consumption, low cost and miniaturisation, which can be used as a sensing node in wireless sensing networks.