A high-performance distributed optical fiber sensor based on phase-sensitive optical time-domain reflectometry (Φ-OTDR) for dynamic strain measurement has been proposed. In this newly designed system, ultraweak fiber Bragg gratings (UWFBGs) are sparsely embedded in the sensing fiber. Through an unbalanced 3 × 3 coupler structure, the reflected lights from two adjacent UWFBGs would be mixed with ea...Show More
Optical network is the backbone of modern data communication. The relevant maintenance technologies are of fundamental importance if the reliability of optical communication network is required. However, traditional monitoring and diagnosing methods such as the Rayleigh back-scattering (RBS) based optical time-domain reflectometry (OTDR) and coherent OTDR (COTDR) are only suitable for static measu...Show More
We have proposed and experimentally demonstrated a distributed vibration and temperature sensing system based on the hybrid of phase-sensitive optical time domain reflectometry (Φ-OTDR) and fiber Bragg grating (FBG). An interrogation technique has been proposed by treating the low reflectivity Gaussian-shaped FBGs pair as an edge filter that linearly translates the wavelength shift into reflection...Show More
