Experimental and theoretical investigation of phase shifted fiber Bragg grating for temperature measurement

Grating based sensors attracts enormous consideration due to their potential applications in the area of communication systems and opto-electronics. So it is essential to develop a suitable theoretical model of a phase shifted fiber Bragg grating (PS-FBG) sensor for temperature measurement. This concept is based on theoretical modeling in the area of the PS-FBG sensor. Our aim is to model the PS-FBG and to illuminate the suitable parameters of PS-FBG such as phase shift variation, the length difference between sections and RI alteration by using the transfer matrix method. Bragg wavelength (BW) shift of PS-FBGs with respect to temperature is also examined. Sensitivity of PS-FBG sensor is same as the FBG sensitivity with a broader bandwidth so PS-FBG overcomes the broad bandwidth requirement in short grating length. In this scheme we use transmitted spectrum of the phase shifted FBG.