When beams of light pass through a fiber optic cable, they tend to degrade.
当光束通过光纤，光强度趋于降低。
2
Based on Finel formulas, the efficiency of the coupling of light source With lightfiber or lightcable entered from a light source was estimated.
本文从菲涅尔公式出发，估算了从光源系统中发出的光进入光纤或光缆的耦合效率。
3
On the other hand, fiber transmission remedy the lacks of cable transmission. Fiber system can resist electromagnetism interference but light module is easier to be affected by temperature.