Distributed Temper ture Sensing with Erbium-Doped Fiber Amplifiers. Kai Yu Ko, P., Demokan, M., S., & Tam, H. Journal of Lightwave Technology, 14(10):2236-2245, 1996.
Distributed Temper ture Sensing with Erbium-Doped Fiber Amplifiers [pdf]Paper  abstract   bibtex   
he experimental verification of a novel fiber-optic sensor which performs distributed megsurement of temperature by using a distributled erbium-doped fiber amplifier (EDFA) is presented. The sensor configuration is similar to that of a conventional optical time-domain reflectometer and detects the Rayleigh backscattered portion of a pulsed optical signal which is amplified by the EiDFA, along with the backward amplified spontaneous emission (ASE) generated by the EDFA. The sensor utilizes the temperatiire dependence of the gain in an EDFA. The amplification provided by the erbium-doped fiber, which is pumped at 1.48 pm, significantly increases the magnitude of the optical signal reaching the receiver, thus leading to a simplified configuration and a potentially superior performance as compared to other 'types of distributed fiber-optic temperature sensors

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