Optical Access Networks That Provide Economically Super Broadband Services

为了经济地为用户提供更高速率的业务，我们提出了副载波数字调制无源光网络（SDM-PON）。 我们首先展示了16-QAM SDM-PON的可行性，该16-QAM SDM-PON向每个用户不断提供1Gbps的服务数据速率，其中ONU偏置QAM信号更高，使得其在转换为光信号之前完全为正（偏置信号发送方案）。 为了降低其发送光功率，我们随后提出了一种用于削波电QAM信号的负分量的方案（削波信号发送方案），沿着提出了三种用于在接收侧再生原始QAM信号的方法。 仿真结果表明，限幅发送信号方案和三种再生方法都是有效的。 所得到的SDM-PON可以支持24个ONU。我们还展示了与偏置信号发送方法相比，限幅信号发送方法可以降低多少平均光发射功率。

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.