Multi-region fiber sensing system using high time resolution tunable pulse correlation OTDR technique

Multi-region fiber sensing system using high time resolution tunable subpicosecond pulse correlation OTDR has been developed. This pulse correlation OTDR technique uses flexible repetitional rate pulse and intensity partial reflection regions along the long fiber. It can reach to a high time resolution of less than 1 ps and a high spatial resolution of less than 0.2 mm. This system can select the regions by scanning the time position method without any crosstalk. This sensor can also reach to the 200 micro strain of resolution and 25000 micro strain of range. Experimental results show a feasibility of multi-region fiber sensing system with remote monitoring more than 10km. It can select the sensing regions by scanning the time position method without any crosstalk and independence on the fluctuation of power and polarization.