Fiber Optic Signal Processing Design

I want to use burried optical fibre cable as a sensor to detect movement . For a long perimeter, buried boundary, pipeline, wall or railway where the alarm must be localised along kilometres of cable,... (Budget: $5000 - $10000 USD, Jobs: Electronics, FPGA, Matlab and Mathematica, Optical Engineering, Signal Processing, Verilog / VHDL)