散乱スペクトルの２階微分によりブリルアン光相関領域反射計の歪ダイナミックレンジと空間分解能を向上させた井上諒君（M2）の論文が、Japanese Journal of Applied Physics に掲載されました。
R. Inoue, K. Kikuchi, R. Jha, H. Lee, and Y. Mizuno, “Convexity-based Brillouin frequency shift extraction in Brillouin optical correlation-domain reflectometry,” Jpn. J. Appl. Phys., vol. 64, no. 12, 120903 (2025).
We experimentally demonstrate a convexity-based method for extracting the Brillouin frequency shift in Brillouin optical correlation-domain reflectometry (BOCDR). The method enhances the Brillouin signal by exploiting the difference in convexity between the true signal and background noise without modifying the optical/electrical setup. Experiments show that the measurable temperature dynamic range was extended from 80 °C to 120 °C and a 0.45-m heated section shorter than the theoretical spatial resolution was detected. The results verify that the proposed signal-processing technique significantly improves the effective performance and reliability of BOCDR for distributed fiber sensing applications.