栁下君（M1）の論文が Japanese Journal of Applied Physics に受理されました。

長距離ファイバ2本を用いたブリルアン光相関領域反射計の計測部遠隔化を提案した栁下君（M1）の論文が、Japanese Journal of Applied Physics に受理されました。

N. Yagishita, R. Ohata, T. Ishimaru, H. Takahashi, K. Toge, and Y. Mizuno, “Remote sensing-unit placement in Brillouin optical correlation-domain reflectometry using long-distance transmission fibers,” Jpn. J. Appl. Phys., accepted.

Field deployment of Brillouin optical correlation-domain reflectometry (BOCDR) is hindered by bulky instrumentation. We propose a remote configuration in which long-distance fibers are inserted in optical paths connected to ports 1 and 3 of the circulator, leaving only the fiber under test and circulator at the sensing site. Distributed strain measurements were demonstrated with fibers up to 4 km. Brillouin frequency shift (BFS) strain coefficients remained stable at 322–329 MHz/%, while differential-BFS standard deviations remained 2.0 MHz or less. The configuration enables remote measurement without degrading spatial resolution and can eliminate the need for a dedicated long delay fiber.