Precision Dynamic Sensing With Ultra-Weak Fiber Bragg Grating Arrays by Wavelength to Frequency Transform

A high-speed interrogator using wavelength to frequency transform is proposed for high-precision demodulation of ultra-weak fiber Bragg gratings (UWFBGs). An amplified spontaneous emission source, modulated by a frequency-swept microwave signal, is adopted as the light source. The signal reflected by the UWFBGs is temporally broadened by a dispersion element, which is then detected and mixed with ...