Low complexity, modulation transparent and joint polarization and phase tracking scheme based on the nonlinear principal component analysis.
A low complexity, modulation transparent and joint polarization and phase tracking scheme based on the nonlinear principal component analysis (NPCA) is proposed and demonstrated via both simulation and experiment. Based on high order statistics, NPCA can achieve joint polarization and phase tracking successfully without any prior information of modulation format. Meanwhile, owing to fact that the estimated matrix is constrained to be a unitary matrix, NPCA can avoid the singularity problem. Compared with the format dependent scheme such as CMA/MMA VVPE, NPCA shows comparable BER performance under the back to back case and shows fast tracking capability over wide polarization rotation rates ranges. Moreover, for 16QAM signals, the proposed NPCA based scheme has reduced around 30% computation resources compared with the format dependent scheme, which confirms the advantage of low implementation complexity.
Optics express