The methods for estimation of optical fiber curvature distribution based on reflectometric measurement on two wavelength and using polarization reflectometry were proposed. The method for estimation of correction coefficients for bend-insensitive optical fibers for was represented. The approbation of methods on test setup of a fiber-optic communication line including segments with different bending radii was performed.
The results of theoretical and experimental study of the vibration sensor based on the few-mode optical fiber are represented in paper. The mode composition of telecommunication single mode fiber working in few-mode regime was obtained by theoretical calculation and experimentally approved. The detection of acoustic influence on few-mode optical fiber was demonstrated and impact of relative mode excitation and state of polarization was registered.
In this paper computer simulation and experimental investigation of the vibration influence on the single-mode optical fiber polarization characteristics was carried out. Measurements were made using a standard optical reflectometer and an external module providing sensitivity to polarization. Based on the obtained data, a measurement algorithm with polarization controller was determined and the method for analyzing the polarization reflectograms was proposed. The possibility of detection and localization of multiple fiber segments under vibration action was demonstrated.
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