| 摘要 |
Into a mixture solution 2 of a high-refractive-index photo-curable resin A and a low-refractive-index photo-curable resin B, light capable of curing only the resin A is led through an optical fiber 1 so that a cured resin 211 of the resin A having a diameter substantially equal to the diameter of a core portion of the optical fiber is formed so as to extend from a tip of the optical fiber. Then, the residual mixture solution 2 is cured. In this manner, a module having the previously cured high-refractive-index resin 211 as an optical waveguide can be formed easily. On this occasion, the mixed state of the mixture solution 2 can be kept good enough to facilitate the formation of the high-refractive-index resin 211 when the solubility parameter delta<SUB>A </SUB>of the high-refractive-index photo-curable resin A and the solubility parameter delta<SUB>B </SUB>and volume fraction Phi<SUB>B </SUB>of the low-refractive-index photo-curable resin B satisfy the following expression (4). <?in-line-formulae description="In-line Formulae" end="lead"?>|delta<SUB>A</SUB>-delta<SUB>B</SUB>|<-7.5Phi<SUB>B</SUB>+6.0 (4)<?in-line-formulae description="In-line Formulae" end="tail"?>
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