Patent ID: 7646959

Claim:
A plastic optical fiber comprising a core for transmitting light and an outer shell provided around said core for keeping said light inside said core, said core including: a copolymer of a first polymerizable compound shown as following Formula (1) and a second polymerizable compound shown as following Formula (2), wherein said core has a refractive index distribution satisfying following Equations (1) and (2) when the center of a cross-sectional circle of said core 65 has a refractive index of N 1 , an outermost part of said core has a refractive index of N 2 , a radius of said core is shown as R 1 and a refractive index distribution coefficient is shown as g: N ( r )= N 1[1−2Δ( r/R 1) g ] 1/2 [Equation (1)] Δ=( N 1 2 −N 2 2 )/(2 N 1 2 ) [Equation (2)] (wherein R 1 and R 2 each independently represent H or D; R 3 represents H, D, CH 3 , CD 3 or a halogen atom; R 4 represents an alkyl group having from 2 to 8 carbon atoms and at least one hydrogen atom substituted with a fluorine atom) (wherein R 1 and R 2 each independently represent H or D; R 3 represents H, D, CH 3 , CD 3 or a halogen atom; X 1 to X 5 each independently represent H, D, a halogen atom or CF 3 , and at least one of X 1 to X 5 is a halogen atom or CF 3 ).