Patent ID: 6606441
Filing Date: 2003-08-12
Classification: G02B

Abstract:
A plastic optical fiber having a first core, a second core with a different refractive index from the first core, disposed concentrically on the outside of the first core, and a clad disposed concentrically on the outside of the second core, wherein:a ratio X (r1/r2) of a first core radius r1 to a second core radius r2 and a ratio Y (n2/n1) of a refractive index difference n2 between the second core and the clad to a refactive index difference n1 between the first core and the clad are in a range satisfying (a) the following expressions: Y&gE;âˆ’1.134X+1.0518â€ƒâ€ƒ(1) X&lE;âˆ’1.4842Y2+1.1097Y+0.7097â€ƒâ€ƒ(2) Y<0.4, or (b) the following expressions: Y&gE;âˆ’1.134X+1.0518â€ƒâ€ƒ(1) X&lE;âˆ’1.4842Y2+1.1097Y+0.7097â€ƒâ€ƒ(2) X&gE;0.76, andâ€ƒâ€ƒ(3) â€ƒprovided that coordinate pairs X=0.8 and Y=0.35 and X=0.8 and Y=0.45 are excepted.