A fiber optic perimeter detection system includes a receiver to receive
output light signals from sensors positioned at different regions, each
sensor including a sensing fiber. Each sensor generates an output light
signal having a specified wavelength, the output light signal having a
property that varies when stress is induced in the sensing fiber. The
perimeter detection system includes a memory to store information related
to a mapping between the wavelengths of the output light signals and the
regions where the sensors are positioned.