Spatial modes provide a potential dimension to boost the capacity of free-space optical (FSO) communication systems. Various modal basis sets can be used. For a given aperture size, complete orthogonal modal basis sets can provide higher capacity compared to incomplete modal basis sets, but are more sensitive to FSO channel impairments, such as atmospheric turbulence. In this invited paper, we review our recent progress in using advanced digital signal processing algorithms for the implementation of high-capacity mode-division multiplexed FSO communication systems when employing complete modal basis sets. Besides turbulence, the relatively high inter-mode crosstalk from a commercial multiplexer/demultiplexer has been taken into account. By employing adaptive loading at the transmitter side and/or advanced multiple-input multiple-output detection algorithms at the receiver side, record-high single-wavelength transmission data rates and spectral efficiency have been achieved over both turbulence-free and turbulent FSO links, where all key devices are commercially available.
|Title of host publication
|2023 23rd International Conference on Transparent Optical Networks (ICTON)
|Marek Jaworski, Marian Marciniak
|Number of pages
|Published - 8 Aug 2023
|International Conference on Transparent Optical Networks
Bibliographical noteFunding: This work was partly supported by EPSRC under grant numbers EP/T009047/1, EP/T009012/1, EP/S003436/1, and EP/S016171/1; European Union’s Horizon 2020 research and innovation programme under the Marie
Skłodowska-Curie grant agreement No. 713694; Future and Emerging Technologies Open grant agreement Super-pixels No. 829116
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- atmospheric turbulence
- digital signal processing
- free-space optics
- mode-division multiplexing
- multiple-input multiple-output
- optical wireless communication