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Optimized four-section bright-pulse distributed Brillouin sensor with high spatial resolution

We propose and demonstrate a Brillouin distributed fiber sensor with high spatial resolution using four-section-brightpulse, in which the second section of the pump pulse acts as sensing pulse, while the third section is used to compensate the second echo. A general analytical model of this kind of technique is presented, which provides a full physical insight into the Brillouin interaction occurring in this configuration. A computing method to optimize the parameters in the system is also given. This simple but useful proposal is experimentally validated that can distinguish the short section with small temperature/strain change.