DSP complexity of mode-division multiplexed receivers

Optics Express
Beril InanSander L Jansen

Abstract

The complexities of common equalizer schemes are analytically analyzed in this paper in terms of complex multiplications per bit. Based on this approach we compare the complexity of mode-division multiplexed digital signal processing algorithms with different numbers of multiplexed modes in terms of modal dispersion and distance. It is found that training symbol based equalizers have significantly lower complexity compared to blind approaches for long-haul transmission. Among the training symbol based schemes, OFDM requires the lowest complexity for crosstalk compensation in a mode-division multiplexed receiver. The main challenge for training symbol based schemes is the additional overhead required to compensate modal crosstalk, which increases the data rate. In order to achieve 2000 km transmission, the effective modal dispersion must therefore be below 6 ps/km when the OFDM specific overhead is limited to 10%. It is concluded that for few mode transmission systems the reduction of modal delay is crucial to enable long-haul performance.

References

Sep 22, 2011·Optics Express·Peter J Winzer, Gerard J Foschini

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Citations

Mar 3, 2018·Scientific Reports·Huiyuan LiuGuifang Li
Oct 10, 2013·Optics Express·David A B Miller
Apr 30, 2016·Optics Letters·Midya PartoDemetrios N Christodoulides
May 15, 2015·Optics Express·Adriana LobatoBerthold Lankl
Dec 5, 2018·Scientific Reports·Filipe M FerreiraAndrew D Ellis
Jul 11, 2021·Nature Communications·Georg RademacherHideaki Furukawa

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