光纤网络工程师培训教材中文版欢迎下载

1．光是一种电磁波。可见光部分波长范围是：390~760nm(毫微米)，大于760nm部分是红外光，小于390nm部分是紫外光。光纤中使用的是：850nm，1300nm，1550nm三种。2．光的折射，反射和全反射。因光在不同物质中的传播速度是不同的，所以光从一种物质射向另一种物质时，在两种物质的交界面处会产生折射和反射。而且，折射光的角度会随入射光的角度变化而变化，当入射光的角度达到或超过某一角度时，折射光会消失，入射光全面被反射回来，这就是光的全反射。不同的物质对相同波长光的折射角度是不同的（即不同的物质有不同的光折射率)，相同的物质对不同波长光的折射角度也是不同。光纤通讯就是基于以上原理而形成的。.........本资料，网上下载，

(1. Light is an electromagnetic wave. The wavelength range of visible light is: 390~760nm (nanometers), the part greater than 760nm is infrared light, and the part less than 390nm is ultraviolet light. The optical fibers used are: 850nm, 1300nm, and 1550nm. 2. Refraction, reflection and total reflection of light. Because the propagation speed of light in different substances is different, when light is emitted from one substance to another substance, refraction and reflection will occur at the interface of the two substances. Moreover, the angle of the refracted light will change with the angle of the incident light. When the angle of the incident light reaches or exceeds a certain angle, the refracted light will disappear, and the incident light will be fully reflected back, which is the total reflection of light. Different substances have different refraction angles for the same wavelength of light (that is, different substances have different refractive indices of light), and the same substance has different refraction angles for different wavelengths of light. Optical fiber communication is formed based on the above principles. .........This information, online download,)

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