An improved LMS algorithm for mode demultiplexing in frequency domain  

作　　者：LI Li LüLin-lin HAN Li 李莉;吕琳琳;韩力(College of Communication Engineering,Jilin University,Changchun 130012,China;College of Physics,Jilin University,Changchun 130012,China)

机构地区：[1]College of Communication Engineering,Jilin University,Changchun 130012,China [2]College of Physics,Jilin University,Changchun 130012,China

出　　处：《Optoelectronics Letters》2021年第3期155-159,共5页光电子快报（英文版）

基　　金：This work has been supported by the National Key Research and Development Project of China(No.2018YFB2201500)。

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 demultiplexing of the 6×6 mode division multiplexing(MDM) system, an improved FD-LMS demultiplexing algorithm is proposed. 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 performance 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 demultiplexing 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 algorithm at a transmission distance of 80 km with DMGD is 50 ps/km.

关 键 词：LMS MODE OSNR 

分 类 号：TN929.11[电子电信—通信与信息系统]