Enhanced-performance fibre Brillouin ring laser for Brillouin sensing applications

Abstract

In this work we disclose a novel double resonant-cavity Brillouin ring-laser for Brillouin sensing employing wavelength locking. The tunable probe light exhibits a low RIN (~-145 dB/Hz) and a narrow pump-locked linewidth (~200 Hz), resulting in a stable BOTDA pump-probe source.

Nonlinear amplification in φ-OTDR for distributed acoustic sensing

“…Distributed optical fiber sensors (DOFS) are an important field of study for applications such as security (for intrusion monitoring, fire detection), geophysics (for seismic measurement), for civil engineering (for application such as structural crack detection). Among the different types of DOFS methods, some employ phenomena such as Brillouin scattering for static temperature and strain measurement [1][2][3] while others. Another type of DOFS, known as distributed acoustic sensors (DAS), allows to detect mechanical vibrations by acquiring continuous strain measurements along a sensing fiber.…”

Study of injection-locked stabilized, short cavity Brillouin ring laser source design for fiber sensing applications

“…Another potentially interesting field of application is distributed optical fiber sensing, which has gathered significant attention in recent years due to the interesting properties of optical fibers, such as resistance and flexibility [4]. A particularly interesting distributed optical fiber sensing method is Brillouin optical time-domain analysis (BOTDA) [5][6][7]. In this sensing scheme, which is also based on SBS, an optical pump amplifies a downshifted, counter-propagating probe along a sensing fiber.…”

Optical characterization of strain sensing cables for Brillouin optical time domain analysis

“…Among the various distributed sensing techniques, Brillouin optical time domain analysis (BOTDA) gained significant relevance amid the scientific and industrial community. BOTDA is based on the Stimulated Brillouin Scattering (SBS) phenomenon and allows to monitor large structures by extracting temperature and strain profiles along tens of kilometers of sensing fiber, with spatial resolutions of the order of few centimeters [11][12][13]. While a great deal of study focuses on the interrogating system, an important factor for BOTDA sensors performance is the structure on the sensing cable.…”