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问1:光缆传输有哪些优点?答:光缆传输与电缆传输相比,主要有以下优点:(1)损耗低、传输距离长。光纤的传输损耗很小,目前单模光纤在波长为1310nm的低损耗窗口每公里损耗在0.35dB;波长为1550nm时的每公里损耗则只有0.2dB,大概是同轴电缆每公里损耗的1%。因此,用光纤构成有线电视干线网,可实现20km无中继,基本满足了一般中小城市有线电视干线传输
Q: 1 What are the advantages of optical cable transmission? A: Optical cable transmission compared with cable transmission, mainly has the following advantages: (1) low loss, long transmission distance. Optical fiber transmission loss is very small, the current single-mode fiber loss in the low-loss window wavelength of 1310nm per kilometer at 0.35dB; wavelength of 1550nm when the loss per kilometer is only 0.2dB, coaxial cable per kilometer loss is about 1% . Therefore, the composition of fiber optic cable trunk network, can achieve 20km without relay, basically meets the general small and medium-sized cities cable television trunk transmission