Kilometers-Range Dark-Pulse Brillouin Optical Time Domain Analyzer with Centimeters Spatial Resolution

A Dark-Pulse Brillouin Optical Time Domain Analyzer (BOTDA) configuration has been proposed to prolong the total sensing length by measuring both Brillouin Gain and Loss effect along fiber. The detected Brillouin signal will be identified by subtracting the two sided band of the Optical Carrier Suppressed (OCS) Stokes light. Due to the innovated configuration, the distributed Brillouin sensor developed for this study achieves a much higher total sensing length without severe received Brillouin Power depletion. The simulations results demonstrated that with the same launched Stokes power, the total sensing length will be prolonged for at least one time with less than 3dB received Power decrease.