11 November 2014 Very high-resolution optical spectral analysis based on Brillouin dynamic gratings
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Abstract
In this paper, a novel method for an ultrahigh resolution optical spectrometry based on Brillouin dynamic gratings (BDGs) is proposed and demonstrated. A coherent acoustic wave is generated in an optical fiber through stimulated Brillouin scattering, and the acoustic wave modulated the fiber refractive index forming a BDG. An ultra-narrow bandwidth optical filter is constructed by operating a BDG in a long single-mode fiber (SMF), and the optical spectrometry is performed by sweeping the center wavelength of the BDG-based filter through a swept-tuned laser. In the experiment, a 4-fm (0.5 MHz) spectral resolution is achieved by operating a BDG in a 400-m SMF.
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Yongkang Dong, Yongkang Dong, Taofei Jiang, Taofei Jiang, } "Very high-resolution optical spectral analysis based on Brillouin dynamic gratings", Proc. SPIE 9274, Advanced Sensor Systems and Applications VI, 92740K (11 November 2014); doi: 10.1117/12.2073419; https://doi.org/10.1117/12.2073419
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