(1) High purity quartz glass optical fiber. This kind of data consumption is low, at the wavelength, the lowest is 0. 47db/km。 The consumption of multimode optical fiber using germanium silicon data as core and boron silicon data as cladding is at least 0.5 db/km and similar consumption spectrum curve. The best consumption spectrum curve may be obtained by using ternary data.

(2) Multicomponent glass fiber. It is usually made of more conventional glass with low consumption. For example, the Sodium borosilica te glass fiber λ= 0.84 μ m minimum consumption is 3.4db/km.

(3) Plastic optical fiber. Compared with quartz optical fiber, it has the characteristics of light weight, low cost, good flexibility and convenient processing, but the consumption is from r=0.63 μ m to 100-200 db/km.

Optical fiber principle:

Optical fiber actually refers to a medium that is made of a fiber core made of transparent data and a cladding made of data with a slightly lower refractive index than the fiber core around it, and reflects the optical signals emitted into the fiber core through the cladding interface, so that the optical signals can spread in the fiber core. As usual, it is a symmetrical cylinder with multilayer medium layout composed of fiber core, cladding and coating layer.