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中师和高中物理教材中 ,在叙述了麦克斯韦电磁理论后 ,进而指出光是一种电磁波 ,后面讲到光的全反射后 ,介绍了利用光可作为载波传输信号 .笔者从教学实践中发现有两个地方影响教学效果 .它们是 :前者的理论叙述比较抽象单调 ,而光通信演示仪集调制、检波于一体 ,传输路程很短
In the textbooks for middle and high school physics textbooks, after interpreting Maxwell’s electromagnetic theory, it is further pointed out that light is an electromagnetic wave. After the total reflection of light, the use of light as a carrier-transmitting signal is introduced. The author found out from the teaching practice. Two places affect the effectiveness of teaching. They are: the theoretical narrative of the former is more abstract and monotonous, and the optical communication demonstrator integrates modulation and detection in one, and the transmission distance is very short.