傾斜利用BOCDRによる偏波ビート長の分布測定を実証した論文が Optical Review に掲載されました。芝浦工業大学の李助教が中心となって進めた共同研究の成果です。
H. Lee, K. Noda, K. Nakamura, and Y. Mizuno, “Fiber-optic distributed measurement of polarization beat length using slope-assisted Brillouin optical correlation-domain reflectometry,” Opt. Rev., vol. 27, no. 6, pp. 542-547 (2020).
We demonstrate distributed measurement of the polarization beat length along single-mode optical fibers (SMFs) using slope-assisted Brillouin optical correlation-domain reflectometry (BOCDR) with high spatial resolution, long measurement range, high sampling rate, and single-end accessibility. The beat lengths of SMFs wound on mandrels with radii of 10.5, 7.5, and 3.4 cm are measured to be 36.0, 18.2, and 3.7 m, respectively, which agree well with theoretical calculations. This indicates that a unique beyond-nominal-resolution effect of slope-assisted BOCDR does not influence the measurement. Subsequently, distributed beat length measurement is demonstrated using an SMF comprising two sections wound on mandrels with different radii (10.5 and 3.4 cm).