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所谓第三次浪潮或第四次产业革命的出现,将从工业社会进入信息社会。信息社会的主导工程为信息工程,即计算机、通信、控制等技术,而光纤则是信息的通道。本文将以石英光纤为主,简单介绍光纤的有关知识。一、原理 (一) 光纤的传播原理由几何光学得知,当光从折射率为n_1光密媒质射入折射率为n_2的光疏媒质时,可能产生三种情况如图1所示。其中,θ_0=sin~(-1)(n_2/n_1),称为临界角。当入射角θ_(i1)<θ_0时,入射线1经
The so-called emergence of the third wave or the fourth industrial revolution will move from industrial society into the information society. The leading project of the information society is information engineering, that is, the technology of computer, communication and control, while the optical fiber is the channel of information. This article will be based on quartz fiber, a brief introduction of optical fiber related knowledge. First, the principle of (a) the principle of propagation of optical fiber by geometrical optics that light from the refractive index of n_1 opaque media into the refractive index n_2 of the optical media, there may be three cases shown in Figure 1. Among them, θ_0 = sin ~ (-1) (n_2 / n_1), called the critical angle. When the incident angle θ_ (i1) <θ_0, the incident ray 1 passes through