| 摘要 |
PROBLEM TO BE SOLVED: To provide a plastic optical fiber which reduces transmission loss and which makes long distance transmission possible. SOLUTION: The plastic optical fiber has cladding layers laminated concentrically on the outer circumference of a core. The plastic optical fiber is characterized in that the core is hollow, that the cladding layer is composed of a multilayered structure in which two kinds of transparent resin materials having a mutually different refractive index n<SB>1</SB>, n<SB>3</SB>are alternately stacked, and that, with the thickness of the cladding layers as d<SB>1</SB>and d<SB>3</SB>respectively, they comprise an expression (1): d<SB>i</SB>=λ/4n<SB>i</SB>sinθ<SB>i,max</SB>(1) where i=1 or 3 andθ<SB>i,max</SB>is the maximum propagation angle of a light beam passing through the layer of a refractive index n<SB>i</SB>. COPYRIGHT: (C)2006,JPO&NCIPI |
