最近几年，光通信已经成为世界范围内的发展热点。在目前世界光通信市场普遍不景气的情况下，我国却一直保持着１０％的增长速度。我国建设的光缆网在整个国家通讯网中发挥了非常重要的作用。现在的长途光缆网覆盖了全国，而且骨干网已经形成了环路，网络的可靠性大大提高。全 In recent years, optical communications has become a hot spot in the world. In the current global optical communications market generally downturn, our country has maintained a 10% growth rate. The optical cable network built in our country plays a very important role in the entire national communications network. Now the long-distance optical cable network covering the whole country, and the backbone network has formed a loop, the reliability of the network greatly improved. all