Experimental evidence of the sensitivity controlling using fast light and slow light in a double-Lorentzian fiber Bragg grating

Abstract

We observed that the sensitivity of a fiber sensor is changed by introducing fast and slow light. In this fiber sensor configuration, fast and slow light are generated by a double Lorenz fiber Bragg grating (DL-FBG) and the probe pulse through DL-FBG will have different delays by varying the input laser wavelength. The maximum delay is 180 ps (slow light) and the maximum advance is 90 ps (fast light). Experimental result shows that the fiber sensor sensitivity obtains enhancement by introducing slow light, while the sensitivity of fiber sensor decreases when combining with the fast light.