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7 November 2012 Spatial resolution improvement based on intensity modulation in measurement of Brillouin dynamic grating localized by correlation domain technique
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Proceedings Volume 8421, OFS2012 22nd International Conference on Optical Fiber Sensors; 84219H (2012) https://doi.org/10.1117/12.968567
Event: OFS2012 22nd International Conference on Optical Fiber Sensor, 2012, Beijing, China
Abstract
We demonstrated that intensity modulation synchronized with laser frequency modulation enhances the spatial resolution in the measurement of Brillouin dynamic grating (BDG) spectrum localized by the correlation domain technique. Following the correlation domain principle, the stimulated Brillouin scattering is localized in so-called correlation peak, but the peak actually has side lobes which excite the BDG out of the peak region. To overcome this, we applied intensity modulation and apodize the optical spectrum of the participating waves to suppress the side lobes. We confirmed spatial resolution improvement from 75 cm to 17 cm in a measurement fiber of 500 m.
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Rodrigo Kendy Yamashita, Zuyuan He, and Kazuo Hotate "Spatial resolution improvement based on intensity modulation in measurement of Brillouin dynamic grating localized by correlation domain technique", Proc. SPIE 8421, OFS2012 22nd International Conference on Optical Fiber Sensors, 84219H (7 November 2012); https://doi.org/10.1117/12.968567
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