基于简化的两级强度特性调制格式识别算法研究

Research on the algorithm of modulation format recognition based on simplified two-stage intensity characteristic

未来弹性光网络要求网络源节点的发射端能够根据链路的传输性能以及用户的多样化需求,动态地改变传输信号的调制格式以及符号率。提出了一种基于简化的两级强度特性调制格式识别算法,通过Godard's误差区分正交相移键控(QPSK)信号,再使用强度噪声方差进一步区分16阶正交幅度调制(16QAM)和64QAM。研究结果表明:物理数据模型-正交相移键控(PDM-QPSK)、PDM-16QAM和PDM-64QAM等高阶调制格式信号的最小所需光信噪比(OSNR)值低于7%前向纠错(FEC)理论阈值(误码率为3.8×10-3)时,能够实现100%的正确识别率,且所提的方案所需的符号数相对较少。

The future elastic optical network requires that the transmitter of the source node can dynamically change the modulation format and symbol rate of the transmission signal according to the transmission performance of the link and the diversified needs of users.A simplified two-stage intensity characteristic modulation scheme recognition algorithm is proposed.In this algorithm,quadrature phase shift keying(QPSK)signals are distinguished by Godard's error,and then 16 order quadrature amplitude modulation(16QAM)and 64QAM are further distinguished by intensity noise variance.The results show that when the minimum optical signal to noise ratio(OSNR)value of high-order modulation format signals such as physical data model-quadrature phase shift keying(PDM-QPSK),PDM-16QAM and PDM-64QAM is lower than 7%forward error correction(FEC)theoretical threshold(error rate is 3.8×10-3),100%correct recognition rate can be achieved,and the number of symbols required by the proposed scheme is relatively small.