实现多媒体时代的关键一般认为在于接入系统应经济地实现 FTTH。这就需求光纤接入系统既能廉价地提供多媒体业务,又能更经济地提供电话等已有业务。PDS(无源双星传输技术)是经济地实现光纤接入系统的基本技术。根据以此为基础 The key to the realization of the multimedia era is that the access system should realize FTTH economically. This requires optical access systems that provide multimedia services cheaply as well as providing existing services such as telephony more economically. PDS (passive binary transmission technology) is the basic technology to achieve optical access system economically. Based on this