放眼全球电信业，技术发展一日千里，突飞猛进，新技术、新方案、新产品层出不穷，这为电信业向社会提供多样化、多层次、多领域通信与信息服务打下技术基础。然而光传输速度在过去１０年中提高了约１００倍，预计在未来１０年中仍将再提高１００倍左右。在超高速的网络中，电 With a view to the global telecom industry, technological development has been rapidly progressing by leaps and bounds. New technologies, new programs and new products have emerged one after another, laying a technological foundation for the telecommunications industry to provide diversified, multi-level and multi-area communications and information services to the community. However, optical transmission speeds have increased about 100 times over the past 10 years and are expected to increase about 100 times over the next 10 years. In the ultra-high-speed network, electricity