| 摘要 |
PURPOSE: To minimize the quantity of an additive material and to reduce the manufacturing cost by adjusting the refractive index distribution shape, the number of layers and the refractive indices of the respective layers under specific conditions. CONSTITUTION: The refractive index distribution shape n(r)is adjusted as the characteristic desirable for the values previously given for color dispersion, visual field diameter, attenuation and over mode cut off. The respective layers are so formed as to contain the additive materials at the ratios enough to satisfy the conditions approximately expressed by equation I while the number (m)of the layers of the thicknessΔr is large than the number of the desirable characteristics and the refractive indices of the respective layers maintain the desirable characteristics. In the equation I, (n) is the refractive index of the fiber material at the distance(r)from the axis of the fiber; n0 is the refractive index of the matrix material and ri =Δr. As a result, the optical transmission fiber which suffices with the additive materials of the smaller amts. is obtd. |
