Subpeaks in the Brillouin loss spectra of distributed fiber-optic sensors.

Curvature and shape distributed sensing using Brillouin scattering in multi-core fibers

Distributed curvature and shape sensing using Brillouin scattering in multi-core fiber (MCF) is presented for the first time to the best of our knowledge, by exploiting bend-dependent Brillouin frequency shift (BFS) in off-center cores. OCIS codes: (060.2310) Fiber optics; (290.5830) Scattering, Brillouin; (060.2370) Fiber optics sensors.

Advanced Pulse Coding Techniques for Distributed Optical Fiber Sensors

Advanced optical pulse coding methods to enhance the performance of distributed optical fiber sensors are reviewed. In particular, the latest implementations dedicated to highperformance long-range Raman and Brillouin based distributed sensing are described. OCIS codes: (060.2370) Fiber optics sensors; (290.5830) Scattering, Brillouin; (290.5860) Scattering, Raman.

A Standard Test Method for Evaluating Crack Monitoring Performance of Distributed Fiber Optic Sensors

In this paper, a standard test method of evaluating the measurement performance of distributed sensors such as Brillouin scattering based fiber optic sensors (FOSs) and other long gauge sensors for monitoring cracks is proposed. The performance evaluation of two types of Brillouin scattering based DFOSs named as BOTDR(Brillouin Optical Time Domain Reflectometry) and PPP-BOTDA (Pulse Pre-Pump Br...

Bipolar pulse coding for enhanced performance in Brillouin distributed optical fiber sensors

We propose and experimentally demonstrate the possibility to use a pump signal based on bipolar pulse sequences using single-sideband suppressed-carrier (SSB-SC) modulation in Brillouin optical time-domain analysis (BOTDA) sensors. The SSB-SC modulated pump makes a sequential use of the Brillouin gain and loss spectra, increasing the intensity contrast of the measurements. The method is demonst...

Brillouin Scattering in Optical Fibers and Its Application to Distributed Sensors