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An active strain sensing system based on single‐longitudinal‐mode distributed Bragg reflector fiber laser and its applications in the measurement of erbium‐doped fiber birefringence
Author(s) -
Zhang Hao,
Liu Bo,
Jia Chenglai
Publication year - 2011
Publication title -
microwave and optical technology letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.304
H-Index - 76
eISSN - 1098-2760
pISSN - 0895-2477
DOI - 10.1002/mop.26302
Subject(s) - materials science , fiber bragg grating , birefringence , polarization maintaining optical fiber , optics , fiber laser , longitudinal mode , laser , distributed bragg reflector , fiber optic sensor , erbium , beat (acoustics) , photonic crystal fiber , optoelectronics , optical fiber , single mode optical fiber , dispersion shifted fiber , wavelength , doping , physics
An active strain sensing system based on single‐longitudinal‐mode distributed Bragg reflector fiber laser is proposed and experimentally demonstrated. Owing to the short laser cavity length and birefringence‐induced mode splitting, the proposed laser in single‐longitudinal‐mode operation provides a beat signal from 1.598 to 2.53 GHz as the strain applied onto the fiber laser changes, and through beat frequency interrogation the proposed laser sensor turns out a strain sensitivity of ∼0.21 MHz/με. Moreover, by simultaneously monitoring the laser wavelength and beat frequency, strain dependence of erbium‐doped fiber birefringence has also been measured, and experimental results show that erbium‐doped fiber birefringence has a strain sensitivity of ∼1.59 × 10 −9 /με. © 2011 Wiley Periodicals, Inc. Microwave Opt Technol Lett 53:2508‐2512, 2011; View this article online at wileyonlinelibrary.com. DOI 10.1002/mop.26302