ヘテロコア光ファイバ中のモード間干渉スペクトルの歪と温度に対する依存性を解明した水野元助教と萩原（OG）らの論文が Japanese Journal of Applied Physics に掲載されました。本論文は、創価大学との共同研究の成果です。
Y. Mizuno, S. Hagiwara, H. Lee, N. Hayashi, M. Nishiyama, K. Watanabe, and K. Nakamura, “Strain and temperature dependencies of multimodal interference spectra in hetero-core-fiber structures,” Jpn. J. Appl. Phys., vol. 59, no. 5, 058002 (2020).
We investigate, for the first time, the temperature and strain dependencies of the spectral dips of the multimodal interference patterns in hetero-core-fiber structures at telecom wavelength. With increasing temperature and strain, the spectral dips shifted to shorter wavelengths with dependence coefficients of –3.5 nm/°C and –0.62 pm/με, respectively. Their absolute values were ~60 times larger and ~30 times smaller than the temperature and strain sensitivities of a standard single-mode-multimode-single-mode sensor, respectively. This result implies that the hetero-core-fiber structures can be potentially used to develop highly sensitive temperature sensors with reduced strain sensitivity.