In many areas with high telluric hazard, our understanding of the seismogenic and mechanical processes is limited by the difficulty or impossibility to deploy arrays of high-performance seismometers or of other geophysical sensors, due to high cost (e.g., offshore) and/or hazard (e.g., lightning, active volcano, high T in boreholes...) of the maintenance. This led us to develop several optical instruments: the principle is to separate, by a long (plurikilometric) optical fiber, the robust mechanical part of the sensor from the opto-electronic part. The latter interrogates the sensor through the long fiber and measures its internal deformation with Fabry-Perot (FP) interferometry. For 10 years, seismometer and tiltmeter prototypes have been qualified and installed at relevant sites by ESEO-LAUM, IPGP and their partners: LSSB (ANR LINEs), La Soufrière Volcano (ANR HIPERSIS), off the Saintes archipelago (INTERREG Caraïbes). More recently, we installed new generation of fiber optic strainmeters in the Garpenberg mine in Sweden (ANR FIMOPTIC) and on the Stromboli volcano. All these sensors are driven by an innovative optoelectronic system, which performs all our signal processing algorithms and provides data in real time. This interrogator has been designed, developed, qualified, produced, and improved by the ESEO-Tech team over years. We present here an overview of these systems and some results from field applications, which might open promising perspectives for monitoring networks in natural or industrial environment (geoindustries or civil engineering).