作者:D. Cavendish
DOI:10.1109/35.846090
日期:2000.6
It took roughly 10 years for the transport network industry to migrate from PDH to SONET. As this technology swap comes to an end, WDM technology is dawning, promising to revolutionize the network industry, with the possibility of transport bit rates above 10 Gb/s as well as transparency to signal encodings. However, a new wave of equipment upgrade is unlikely to happen as current SONET equipment is just beginning to pay off for its large investment. Thus, in years to come, SONET technology, the current standard for optical fiber access, will have to make room for WDM technology in a gradual way. On its part, WDM equipment must be developed to be backward compatible with SONET technology. This article discusses the requirements and issues involved in making WDM technology interoperable with SONET legacy equipment, as well as the evolution path toward a transparent optical transport network.
传输网络行业从 PDH 迁移到 SONET 大约花了 10 年时间。随着这一技术交换的结束,波分复用(WDM)技术正在崛起,有望彻底改变网络行业,其传输比特率可能超过 10 Gb/s,而且信号编码透明。然而,新一轮的设备升级不太可能发生,因为目前的 SONET 设备刚刚开始收回其巨额投资。因此,在未来几年里,SONET 技术作为目前的光纤接入标准,将不得不逐步为波分复用技术让路。而波分复用技术设备的开发必须向后兼容 SONET 技术。本文讨论了使波分复用技术与 SONET 传统设备互操作所涉及的要求和问题,以及向透明光传输网络演进的途径。