芝浦工業大学との共同研究の成果が Japanese Journal of Applied Physics に受理されました。

ブリルアン光相関領域反射計に基づく融着点検出法を開発した芝浦工業大学の井上君（M2）の論文が、Japanese Journal of Applied Physics に受理されました。

R. Inoue, K. Kikuchi, S. Tsurugai, R. Jha, H. Lee, and Y. Mizuno, “Detection of sleeve-induced strain near fusion splice points using Brillouin optical correlation-domain reflectometry,” Jpn. J. Appl. Phys., accepted.

Fusion splice points are essential in optical networks but difficult to detect when insertion losses are extremely small. Conventional reflectometry methods, such as optical time-, frequency-, and correlation-domain reflectometry systems, are not sufficient to identify high-quality splices with low losses. In this work, we demonstrate splice detection using Brillouin optical correlation-domain reflectometry (BOCDR), which captures compressive strain induced by heat-shrink sleeves. Distributed measurements along a 12.8-m silica single-mode fiber reveal Brillouin frequency downshifts equivalent to –0.055% to –0.078% strain, enabling clear splice identification. These results establish BOCDR as a practical diagnostic tool for reliable fiber-network maintenance.