As a transmission type filter

phase-shifted fiber Bragg grating can be widely applied in the fields of optical communications and sensing.This paper introduces a novel micro-structured phase-shift fiber grating that is based on fiber cladding etching technology

analyzes by using the fiber double-cladding theory the effects of the cladding etching depth and the environmental refractive index on the effective refractive index of the fundamental mode of the fiber core and the correlation between the etching depth

width and location with the reflective spectrum of the micro-structured phase-shift fiber grating on the basis of combining the resonance theory and the transfer matrix method.