Optoelectronics Letters, Volume. 17, Issue 3, 155(2021)
An improved LMS algorithm for mode demultiplexing in frequency domain
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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LI Li, Lü Lin-lin, HAN Li. An improved LMS algorithm for mode demultiplexing in frequency domain[J]. Optoelectronics Letters, 2021, 17(3): 155
Received: Jun. 28, 2020
Accepted: Jul. 23, 2020
Published Online: Sep. 2, 2021
The Author Email: Li LI (LL@jlu.edu.cn)