Beat Noise Reduction by Fast Optical Switching in Brillouin Grating-Based FMCW Reflectometry

We demonstrated an optical switching method for deriving a Brillouin reflectogram from a 1-m-long optical fiber without the use of a polarization diversity technique or a least-squares procedure in coherent frequency-modulated continuous wave reflectometry. We reduced the intrinsic beat noise by blo...

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Bibliographic Details
Published inIEEE photonics technology letters Vol. 29; no. 13; pp. 1078 - 1081
Main Authors Takada, Kazumasa, Yasuno, Takahiro, Satoh, Shin-ichi
Format Journal Article
LanguageEnglish
Published IEEE 01.07.2017
Subjects
Brillouin dynamic grating
fiber sensing
four-wave mixing
interference
nonlinear optics
Optical fibers
Optical pumping
Optical switches
Pump lasers
Scattering
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Summary:We demonstrated an optical switching method for deriving a Brillouin reflectogram from a 1-m-long optical fiber without the use of a polarization diversity technique or a least-squares procedure in coherent frequency-modulated continuous wave reflectometry. We reduced the intrinsic beat noise by blocking one pump light from entering the balanced mixer for 120 μs with an acousto-optic modulator while sweeping the laser wavelength at a rate of 0.5 nm/s. The variations in the derived reflectograms at the center of the Brillouin spectrum were within ±14 %, and these were governed mainly by the multiplicative noise.
ISSN:1041-1135
1941-0174
DOI:10.1109/LPT.2017.2702169