A FBG and Magnetostrictive Alloy based Magnetic Field Sensor with the Demodulation realized by Optoelectronic Oscillator

A FBG and magnetostrictive alloy based magnetic field optical sensor is realized with the demodulation by a new dual-loop optoelectronic oscillator (OEO). Unlike the previously reported OED-based sensing schemes, the stability of this proposed scheme is enhanced by using the combination of a fiber ring laser (FRL) cavity and a dual-loop OEO structure. The sensitivity of −48.40476 Hz/mT is obtained. The stability is up to 0.194 ppm.