Optical Access Networks That Provide Economically Super Broadband Services

点击翻译按钮获取中文摘要

To economically provide higher bit rate services to users, we proposed the Subcarrier Digital Modulation Passive Optical Network (SDM-PON). We first showed the feasibility of a 16-QAM SDM-PON that constantly provides the service data rate of 1 Gbps to each user, in which ONU biases the QAM signal higher so that it is entirely positive before converting into an optical signal (bias signal sending scheme). To decrease its sending optical power, we then proposed a scheme for clipping negative components of the electrical QAM signal (clipped signal sending scheme), along with three methods for regenerating the original QAM signal at the receiving side. We showed that the clipped sending signal scheme, and all three regenerating methods, are effective by simulation. The resulting SDM-PON can support 24 ONUs We also showed how much the clipped signal sending method can reduce average optical launch power as compared to the bias signal sending method.