Patent ID: 7488929

Claim:
An apparatus comprising: fiber optic sensors positioned at different regions, each fiber optic sensor comprising: a sensing fiber, and a wavelength division multiplexing filter to receive wavelength division multiplexed signals intended for multiple fiber optic sensors, allow one of the light signals having a specific wavelength to pass to the sensing fiber and prevent light signals intended for other fiber optic sensors from passing to the sensing fiber, each fiber optic sensor generating an output light signal having the specific wavelength, the output light signal having a property that varies when stress is induced in the sensing fiber, wherein the wavelength division multiplexing filter multiplexes the output light signal from the fiber optic sensor with output light signals from other fiber optic sensors to generate wavelength division multiplexed output light signals; a receiver to receive the wavelength division multiplexed output light signals; and a memory to store information related to a mapping between the wavelengths of the output light signals and the regions where the fiber optic sensors are positioned.