Abstract
A unique technique to achieve high resolution interrogation of Fiber Bragg Grating(FBG) sensor based on dispersive time delay and Four wave mixing(FWM) effect is proposed. The wavelength shift induced by small strain or temperature on uniform FBG significantly enhances the time shift of the pulse reflected from linearly chirped fiber Bragg grating(LCFBG) by utilizing two stage FWM process in combination with wavelength–to-time mapping effect of LCFBG. The proposed scheme presents high robustness to power fluctuations in the system. A high strain sensitivity of 6.59 ps/με and temperature sensitivity of 72.5 ps/oC with corresponding strain and temperature resolution of 0.15 με and 0.01oC respectively is attained using the proposed scheme. The significance of the proposed scheme lies in enhancement of the time shift of the pulse without the usage of high dispersive device and simultaneous realization of temperature compensation and high strain sensitivity.
Sign-in/Register to access full text options 
Free) 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call
