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Indexed by:期刊论文

Date of Publication:2015-03-01

Journal:OPTICAL ENGINEERING

Included Journals:SCIE

Volume:54

Issue:3

ISSN No.:0091-3286

Key Words:polarization effect; single-mode fiber; distributed temperature sensor; incoherent optical frequency domain reflectometry

Abstract:In order to reduce the polarization-induced impact on the incoherent optical frequency domain reflectometry based single-mode fiber-optic distributed temperature sensor, a synchronous polarization scrambling technique with a low-speed electrically driven polarization controller (EPC) is presented. The polarization-induced error is derived by error analysis. By simulating the distribution of the states of polarization on the Poincare sphere, optimized EPC driven parameters are selected. The polarization scrambling process is synchronous with the frequency response measurement of the Raman backscattered light. Additionally, the scrambling period is set to be equal to the measurement time of each frequency response. Experimental results show that the polarization-induced error is similar to +/- 3 degrees C, and it is basically in accord with the result of a theoretical error analysis. By using the synchronous polarization scrambling technique, the polarization-induced fluctuation of the measured temperature distribution has been almost eliminated. (C) 2015 Society of Photo-Optical Instrumentation Engineers (SPIE)