機械式長周期ファイバグレーティングにおけるクラッドモード損失の伝送特性への影響

カテゴリ: 論文誌(論文単位)

グループ名: 【C】電子・情報・システム部門

発行日: 2020/07/01

タイトル(英語): Cladding Mode Loss Effect on Transmission Characteristics of Mechanically Induced Long-period Fiber Gratings

著者名: 堤　康宏（立命館大学／大阪府立大学），北原　健太（大阪府立大学），大橋　正治（大阪府立大学），久保田　寛和（大阪府立大学），三好　悠司（大阪府立大学），山下　育男（関西電力（株））

著者名(英語): Yasuhiro Tsutsumi (Ritsumeikan University/Osaka Prefecture University), Kenta Kitahara (Osaka Prefecture University), Masaharu Ohashi (Osaka Prefecture University), Hirokazu Kubota (Osaka Prefecture University), Yuji Miyoshi (Osaka Prefecture University), Ikuo Yamashita (Kansai Electric Power Co. Inc.)

キーワード: 光ファイバセンサ，機械式長周期ファイバグレーティング，クラッドモード損失，伝達行列モデル　　optical fiber sensor，mechanically induced long-period fiber gratings，cladding mode loss，transfer matrix model

要約(英語): In the mechanically induced long-period fiber grating (MLPFG) fabricated by applying the periodical pressure on an optical fiber, the small bending occurs due to the periodical pressure, which influences the losses of the core and cladding modes. We propose the theoretical model of the MLPFG for estimating its transmittance based on the transfer matrix method and investigate the effect of the losses of the core and cladding modes in the MLPFG on the transmittance, theoretically and experimentally. We numerically clarify that the transmitted light spectrum of MLPFG shows only the main attenuation lobe, no side lobe and the attenuation bandwidth is broadened as the cladding mode loss increases. We also clarify that the coupling coefficient, and the losses of the core and cladding modes in the fabricated MLPFG can be estimated from the measured transmitted spectrum based on our model. Moreover, we measure the transmittance of two types of MLPFGs that fabricated with a screw, weights and metallic plates, and that fabricated with a screw and a heat-shrinkable tube. The measured spectra show good agreements with the calculated ones using our model. Our model will be useful for designing MLPFGs applied to the sensors.

本誌: 電気学会論文誌C（電子・情報・システム部門誌） Vol.140 No.7 （2020） 特集：2019年電子・情報・システム部門大会

本誌掲載ページ: 682-688 p

原稿種別: 論文／日本語

電子版へのリンク: https://www.jstage.jst.go.jp/article/ieejeiss/140/7/140_682/_article/-char/ja/