王さん（元研究員）の論文が Japanese Journal of Applied Physics に掲載されました。

プラスチック光ファイバ中のモード間干渉に基づく温度センシングの感度をPC-APC結合を用いて向上させた王さん（元研究員）の論文が、Japanese Journal of Applied Physics に掲載されました。

K. Wang, Y. Mizuno, K. Kishizawa, Y. Toyoda, H. Lee, K. Ichige, W. Kurz, X. Dong, M. Jakobi, and A. W. Koch, “Temperature sensing based on multimode interference in polymer optical fibers: sensitivity enhancement by PC-APC connections,” Jpn. J. Appl. Phys., vol. 61, no. 11, 118001 (2022).

A simple, stable, and high-sensitivity temperature sensor based on multimode interference (MMI) in a polymer optical fiber (POF) with higher-order mode excitation is developed. In a single-mode–multimode–single-mode (SMS) structure, one of the two ends of the multimode POF with physical-contact (PC) connectors is connected to a silica single-mode fiber with an angled-PC (APC) connector to make use of higher-order propagation modes in the POF. Three configurations (no PC-APC, PC-APC at input, and PC-APC at output) are compared, and the maximal temperature sensitivity of 219.2 pm/degC, which is more than double the value of the standard (no PC-APC) SMS structure, is obtained. This result indicates that the temperature sensitivity can be stably enhanced at a low cost by the use of PC-APC connections.