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NUS Graduate School for Integrative Sciences and Engineering Research Project Write-up Title of Project : Long-Distance Optical Fiber Sensor Systems Name of Supervisor : YU Changyuan Contact Details: ECE, NUS, Phone: 65163590, E-Mail: [email protected] Short Description Fiber Bragg grating (FBG) fiber sensors are very attractive in many applications due to their high versatile advantages such as high sensitivity, electro-magnetic immunity, compactness, high resolution and high optical signal-to-noise ratio (SNR) against the noise. Because of the noise and loss induced by the Rayleigh scattering and attenuation along the fiber respectively, the maximum sensing distance of a FBG sensor system with a broadband light source is limited up to 25 km. In practical usage, simple and easy launched long-distance sensor systems are desired. In this project, we propose a novel sensor system to measure the temperature and strain based on erbium-doped fiber (EDF) and Raman amplification, which can reach a distance over 100 km.