About KAWAI SHIGERU
About オプト・イーカレッジ
About Optronics
About optical fiber
About light propagation
About propagation characteristic
About total reflection
About refractive index
About numerical aperture
About transmission loss
About optical communication
About critical angle
About bending loss
About optical fibre loss
About optical fibre testing
About Optical waveguide,optical fibers,and fiber optics
About ひかり
About 発見
About 光ファイバ