A Novel Edge Filter Demodulation Method Using High Birefringence Fiber Sagnac Loop Mirror

A novel way of edge filter demodulation for fiber Bragg grating(FBG) sensor was put forward,by using a high birefringence fiber Sagnac loop mirror as edge filter to demodulate guasi-linearly FBG sensor wavelength shift in range of about 6 nm.The experimental results are in agreement very well with the theoretical analysis.