後方ブリルアン散乱をシードとするカスケード型前方ブリルアン散乱の特性を解明した論文が IEICE Electronics Express に掲載されました。光産業創成大学院大学の林特任助教が中心となって進めた共同研究の成果です。
N. Hayashi, Y. Mizuno, H. Lee, K. Nakamura, S. Y. Set, and S. Yamashita, “Characterization of cascaded forward Brillouin scattering seeded by backward stimulated Brillouin scattering in optical fibers,” IEICE Electron. Express, vol. 17, no. 12, 20200139 (2020).
We present a method for generating cascaded forward Brillouin scattering (CFBS) on the basis of a counter-propagated pump-probe technique with backward stimulated Brillouin scattering used as its seed. The CFBS, induced by forward stimulated Brillouin scattering (FSBS), is generated via the energy transfer from the probe light to other acoustic resonance frequencies. The CFBS spectrum generated in a 390-m-long highly nonlinear fiber exhibits a high signal-to-noise ratio (SNR), and the center frequencies of its acoustic resonance peaks agree with theoretical values. In addition, the SNR dependence on pump/probe powers and the CFBS frequency shift dependence on temperature are investigated.