Abstract
To improve the sensitivity of Brillouin optical time domain reflecting (BOTDR) based on the
Mach–Zehnder interferometer (MZI), a novel method was proposed by using fiber grating (FG). The FG
was introduced not only as a filter to reduce the noise caused by Fresnel reflection and Rayleigh
scattering, but also as the slow-light medium to improve the sensitivity of MZI used in BOTDR.
Both uniform and nonuniform FGs were modeled, and then their transmission and group index spectra
were calculated. By calculating the sensitivities of BOTDR demodulation, it was found that the
power of noise light could be greatly reduced when nonuniform FG was utilized. Meanwhile, the
phase and relative output power sensitivities of BOTDR demodulation could be improved to almost
20 times as large as the ones based on double-pass MZI. Besides, the sensitivity of BOTDR
distributed sensor could also be improved.
© 2013 IEEE
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