ファイバ・ブラッグ・グレーティングを用いた小型波長可変フィルタ

概要

論文の詳細を見る
A fiber Bragg grating (FBG) is an attractive optical filter for dense wavelength division multiplexing (DWDM) systems, because of its narrow bandwidth. The Bragg wavelength (⋋_B)of the reflected back light from the FBG can be varied by controling a grating oitch (Λ) or an effective refractive index (n_<eff>)of the FBG oortion. Therefore, wavelength tunable FBG filter can easily be constructed by changing A and/or n_<eff> by applying heat and/or stress to the FBG portion. In this study, we propose compact tunable FBG filters using a Ni film heater coated on the FBG and a shape memory alloy (SMA) coil actuator. We also demonstrate precise wavelength control of under 1 nm by supplying currents to the heater and SMA coil. As a result, we confirmed that ⋋_B shift was observed by heating the Ni film directly coated on the FBG and by applying tensile stress to the FBG using SMA coil connected both edges of the FBG.
香川高等専門学校の論文
2003-06-30