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光纤同轴电缆混合网(HFC)有两种结构方式,一种来自有线电视网(CATV),另一种来自电信网。 目前,我国有几亿台电视机,电视机数量远远超过电话机许多倍。有线电视网(CATV)发展迅速,不断壮大,仅有钱电视台已超过千家。小范围的CATV网之间正在通过卫星信道、微波信道或光纤信道实现互连,形成地理覆盖范围更大的CATV网。显然,如果将CATV网从目前的广播式网络改造为双向的交互式网络,让电视与电信业务集成一体,那将使CATV网成为一种新的计算接入网。目前,CATV网多采用同轴电缆,各局部CATV网之间的互连用光缆比较理想,因此,HFC网技术将成为研究开发的热点。 进入90年代以来,由于高线性DFB(分布反馈线)
Fiber Coax Hybrid (HFC) There are two types of fabrications, one from the CATV network and the other from the telecommunications network. At present, there are hundreds of millions of TV sets in our country, and the number of TV sets far exceeds the number of telephones by many times. Cable television network (CATV) rapid development, growing, only money television has more than a thousand. The small-scale CATV networks are being interconnected by satellite channels, microwave channels or fiber channels to form a CATV network with a larger geographic coverage. Obviously, if the CATV network is transformed from the current broadcast network to a two-way interactive network that integrates television and telecommunications services, it will make the CATV network a new computing access network. At present, the CATV network uses more coaxial cables, and the interconnection cables between local CATV networks are ideal. Therefore, the HFC network technology will become a hot spot for research and development. Since entering the 90's, due to the high linear DFB (distributed feedback line)