| 摘要 |
A plastic glass optical fiber includes a glass core (diameter a1, relative refractive index difference &Dgr;1, and refractive index n1), a polymer core (diameter a2, relative refractive index difference &Dgr;2, and refractive index n2), and a polymer cladding (refractive index n3), in which the diameter a1 of the glass core is within a range of 110 μm to 200 μm, a parameter X (X is a22/a12) is within a range of 1.15≦̸X≦̸2.9, a parameter Y (Y is &Dgr;2/&Dgr;1) is within a range of 0.25≦̸Y≦̸0.84X−0.68 (when 1.15≦̸X≦̸2) or 0.48X−0.71≦̸Y≦̸−(2/9)X+13/9 (when 2≦̸X≦̸2.9), a parameter ZR (ZR is Z2core/Z1core; Z2core=a22&pgr;/4×√(n12−n32) and Z1core=a12&pgr;/4×√(n12n−n22)) is within a range of 1.25≦̸ZR≦̸4.
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