Differential multiplexing of fiber bragg gratings by means of optical time domain refractometry
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A differential method of detection and multiplexing of signals from fiber Bragg gratings based on optical time domain reflectometry is developed. The method is based on probing of a system of gratings by means of short laser pulses and measurement of the power of the resulting reflected pulses by means of standard fiber-optic reflectometry. The proposed method may find extensive use in the area of monitoring of deformation and temperature distributions by means of fiber-optic sensors based on Bragg gratings.
Key wordsfiber Bragg grating (FBG) optical time domain reflectometry (OTDR) optical reflectormeter
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