An improved LMS algorithm for mode demultiplexing in frequency domain

• 作者: LI Li L(ü) Lin-lin HAN Li
• 来源期刊: 光电子快报（英文版）
• 年，卷（期）: 2021,（3）
• 所属期刊栏目: Optical Fibers and Communications
• 页码范围: 155-159
• 页数: 5页
• 语种: 英文
• DOI: 10.1007/s11801-021-0111-9

摘要

In order to solve the problem that the traditional frequency domain least mean square(FD-LMS)algorithm will lose efficacy with the increase of differential mode group delay(DMGD)when the algorithm is used for demultiplex-ing of the 6×6 mode division multiplexing(MDM)system,an improved FD-LMS demultiplexing algorithm is pro-posed.By improving the error signal calculation method,the convergence performance of the output signal of the equalization filter is improved,and the steady-state error of the algorithm is reduced.Besides,the equalization per-formance of the traditional FD-LMS algorithm is compared with the improved FD-LMS algorithm.Simulation results show that the improved FD-LMS algorithm has great advantage over the traditional FD-LMS algorithm in demulti-plexing performance on the premise that the computation complexity does not significantly increase.The optical signal to noise ratio(OSNR)penalty of the improved FD-LMS algorithm is 2.6 dB lower than that of traditional FD-LMS al-gorithm at a transmission distance of 80 km with DMGD is 50 ps/km.