基于光开关阵列的灵活TWDM-PON系统研究

Research on flexible TWDM-PON system based on optical switch array

为了满足接入网日益增长的业务流量需求,解决当前因架构固定、资源维度有限而导致的不同无源光网络之间波长无法灵活分配的的问题,提出了一种将发射固定波长的激光器与光开关阵列组合的时分波分混合复用无源光网络结构。在这种新的系统结构中,下行波长资源被集中化处理,采用在局端配置光开关阵列的方法实现波长在不同网络之间的灵活调度,降低系统总体成本的同时能够用来解决负载平衡、流量“潮汐效应”、网络资源利用率低下等问题。通过理论分析和仿真实验验证了系统的可行性,得出该结构与传统无源光网络的兼容性、波长资源的共享性、系统低成本以及节能的特点。结果表明,在没有色散补偿的情况下,信号可以覆盖30 km的传输距离,同时服务512个用户。该研究可以为典型应用场景下的无源光网络部署提供参考。

In order to meet the increasing service traffic requirements of access networks and solve the problem that wavelengths between different passive optical networks cannot be flexibly allocated due to fixed architecture and limited resource dimensions,a time and wavelength division multiplexed passive optical network(TWDM-PON)structure combining lasers emitting fixed wavelengths and optical switch array was proposed.In this new system structure,the downstream wavelength resources were centralized,and the method of configuring the optical switch array at the central office was used to achieve flexible scheduling of wavelengths between different networks.This system can be used to solve the problems such as load balancing,traffic"tidal effect",and low utilization of network resources while reducing overall costs.The feasibility of the system was verified by theoretical analysis and simulation experiments,and the compatibility of the structure with the traditional passive optical network,the sharing of wavelength resources,the low cost of the system,and the characteristics of energy saving were analyzed and demonstrated.Experimental results show that the signal can cover a transmission distance of 30 km without dispersion compensation and can serve 512 users at the same time.This study can provide a reference for passive optical network deployment in typical application scenarios.