Toray Industries, Inc.

Koki Mitsuno

Satoshi Matsuba

Kenji Hiramoto

A plastic optical fiber that has a multilayer structure that includes a core (X), a first cladding (Y), and a second cladding (Z), wherein the core is made of an organic polymer material having a water-absorbing ratio of not less than 0.001% and not more than 0.29% and a total light transmittance of not less than 80% and containing not less than 0.01% by weight and not more than 10% by weight of a plasticizer; a relationship between a refractive index of the core (X) and the refractive index of the first cladding (Y) is defined by inequality: X−Y>0.01, and a relationship between a refractive index of the first cladding (Y) and the refractive index of a second cladding (Z) is defined by inequality: Y−Z>0.05, wherein the plastic optical fiber has high humidity resistance and excellent bending resistance.

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Nagoya, Japan

Koki Mitsuno