The quick rise of emerging technologies like spectrally efficient multicarrier with a higher order modulation and bandwidth variable wavelength selective switches have caused a shift of the optical network architecture from fixed to the flexible elastic optical network (EON), in terms of bit rate, center frequency spacing, modulation format, and optical reach. By using bandwidth-variable transceivers, colorless flexible-grid reconfigurable optical add-drop multiplexers (ROADM), as well as a choice of different optical source types, operators can provide a range of service types and improve network efficiency. Implementation of the EON network requires careful consideration, especially in terms of the ROADM structure to achieve optimal performance. We propose a low-cost ROADM structure with an order-based connection method that includes a high degree with a blocking probability of less than 10-4. Then, we applied the new design of ROADM in EON that transported 1 Tb/s. In the final step, we conclude that our system accommodated 20 percent more traffic demand over an average of the low-rate wavelength approach.

翻译：新兴技术（如高频谱效率的多载波高阶调制与带宽可变波长选择开关）的快速发展，导致光网络架构在比特率、中心频率间隔、调制格式和光传输距离等方面从固定模式向灵活弹性光网络（EON）转变。通过采用带宽可变收发器、无色灵活栅格可重构光分插复用器（ROADM）以及不同类型光源的选择，运营商可提供多种服务类型并提升网络效率。EON网络的实施需要谨慎考虑，尤其是ROADM结构的设计以实现最优性能。我们提出一种基于顺序连接方法的低成本ROADM结构，该结构具有高维度特性且阻塞概率低于10⁻⁴。随后，我们将该新型ROADM设计应用于传输1 Tb/s信号的EON中。最终结果表明，相较于低速波长方法的平均水平，我们的系统可承载多20%的流量需求。