基于OSNR感知的SDON路径优化机制

OSNR Awareness Based Lightpath Optimization in SDON

随着SDON(软件定义光网络)向着超高速大容量方向发展,网络规模日益庞大,光路长度的增长面临着各种信号损伤的问题。为此,文章提出了一种基于OSNR(光信噪比)感知的路径优化机制。该机制将光信噪性能作为建立光路连接的重要判断条件,并在光网络的流表交互过程中引入OSNR因素,从而避免接收端节点因误码率过高而导致通信阻塞。仿真结果表明,所提机制在非理想的光网络环境下能够有效提高光路建立的成功率。

As optical networks evolve toward Software Defined Optical Networks（SDON）with higher speed and greater capacity,the scale of optical networks is also enlarged increasingly,which leads to the longer lightpath and accumulated optical signal degradation problems.In order to solve this problem,this paper proposes a Optical Signal Noise Rate（OSNR）awareness based lightpath optimization scheme in OpenFlow enabled SDON.This proposed scheme is able to take the OSNR factor into consideration and introduce OSNR factor into the lightpath establishment and wavelength allocation.Thus,the communication blocking due to low OSNR value can be avoided.Simulation results show that the proposed scheme can achieve better performance on successive rate of lightpath establishment under non-ideal networks.