@article{c34f6ef0a71d4942867408c2fce13f3e,
title = "Refractive-index-sensing optical comb based on photonic radio-frequency conversion with intracavity multi-mode interference fiber sensor",
abstract = "Optical frequency combs (OFCs) have attracted attention as optical frequency rulers due to their tooth-like discrete spectra together with their inherent mode-locking nature and phase-locking control to a frequency standard. Based on this concept, their applications until now have been demonstrated in the fields of optical frequency metrology. However, if the utility of OFCs can be further expanded beyond their application by exploiting new aspects of OFCs, this will lead to new developments in optical metrology and instrumentation. Here, we report a fiber sensing application of OFCs based on a coherent link between the optical and radio frequencies, enabling high-precision refractive index measurement based on frequency measurement in radio-frequency (RF) region. Our technique encodes a refractive index change of a liquid sample into a repetition frequency of OFC by a combination of an intracavity multi-mode-interference fiber sensor and wavelength dispersion of a cavity fiber. Then, the change in refractive index is read out by measuring the repetition frequency in RF region based on a frequency standard. Use of an OFC as a photonic RF converter will lead to the development of new applications in high-precision fiber sensing with the help of functional fiber sensors and precise RF measurement.",
author = "Ryo Oe and Shuji Taue and Takeo Minamikawa and Kosuke Nagai and Kyuki Shibuya and Takahiko Mizuno and Masatomo Yamagiwa and Yasuhiro Mizutani and Hirotsugu Yamamoto and Tetsuo Iwata and Hideki Fukano and Yoshiaki Nakajima and Kaoru Minoshima and Takeshi Yasui",
note = "Funding Information: Exploratory Research for Advanced Technology (ERATO), Japanese Science and Technology Agency (MINOSHIMA Intelligent Optical Synthesizer Project, JPMJER1304). Funding Information: 1Graduate School of Advanced Technology and Science, Tokushima University, 2-1, Minami-Josanjima, Tokushima, Tokushima 770-8506, Japan 2JST, ERATO, MINOSHIMA Intelligent Optical Synthesizer Project, 2-1, Minami-Josanjima, Tokushima, Tokushima 770-8506, Japan 3Graduate School of Natural Science and Technology, Okayama University, 3-1-1 Tsushima-naka, Kita-ku, Okayama, Okayama 700-8530, Japan 4School of System Engineering, Kochi University of Technology, 185 Miyanokuchi, Tosayamada, Kami, Kochi 782-8502, Japan 5Graduate School of Technology, Industrial and Social Sciences, Tokushima University, 2-1, Minami-Josanjima, Tokushima, Tokushima 770-8506, Japan 6Graduate School of Engineering, Osaka University, 2-1, Yamadaoka, Suita, Osaka 565-0871, Japan 7Center for Optical Research and Education, Utsunomiya University, 7-1-2, Yoto, Utsunomiya, Tochigi 321-8585, Japan 8Graduate School of Informatics and Engineering, The University of Electro-Communications, 1-5-1, Japan 9These authors contributed equally to this work *yasui.takeshi@tokushima-u.ac.jp",
year = "2018",
month = jul,
day = "23",
doi = "10.1364/OE.26.019694",
language = "English",
volume = "26",
pages = "19694--19706",
journal = "Optics Express",
issn = "1094-4087",
publisher = "The Optical Society",
number = "15",
}