Abstract
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.
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This work has been supported by the National Key Research and Development Project of China (No.2018YFB2201500).
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Li, L., Lü, Ll. & Han, L. An improved LMS algorithm for mode demultiplexing in frequency domain. Optoelectron. Lett. 17, 155–159 (2021). https://doi.org/10.1007/s11801-021-0111-9
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DOI: https://doi.org/10.1007/s11801-021-0111-9