@article{b2963bef74aa466a8283af1de64e75c6,
title = "Weakly coupled 10-mode-division multiplexed transmission over 48-km few-mode fibers with real-time coherent MIMO receivers",
abstract = "For weakly coupled mode-division multiplexed (MDM) transmission systems, we design and implement optical coherent receiver prototypes with real-time multiple-input multipleoutput (MIMO) digital signal processing to equalize two degenerate linearly polarized modes with dual polarization. Using field programmable gate array circuits, we implement real-value 8 × 2 MIMO adaptive equalization with externally separated phase compensators based on the least mean square algorithm, which enables not only training equalization but also fast carrierphase tracking. With the optical coherent MIMO receiver prototype, we demonstrate real-time weakly coupled 10 ×MDM wavelength-division multiplexed dual-polarization quadrature phase shift keying transmission over 48-km few-mode fibers. This report shows a record number of multiplexed spatial modes, namely, 10 modes with dual polarization, in real-time MDM transmission experiments.",
author = "Shohei Beppu and Koji Igarashi and Masahiro Kikuta and Daiki Soma and Tomoyuki Nagai and Yasuo Saito and Hidenori Takahashi and Takehiro Tsuritani and Itsuro Morita and Masatoshi Suzuki",
note = "Funding Information: Ministry of Internal Affairs and Communications (JPMI00316, SCOPE #171507001); National Institute of Information and Communications Technology; Japan Society for the Promotion of Science (KAKENHI Grant Number 18H03231). Funding Information: Some of the research results were achieved by the Ministry of Internal Affairs and Communications (MIC), Research and Development of Innovative Optical Network Technology for a Novel Social Infrastructure (JPMI00316) (Technological Theme II : OCEANS), the MIC SCOPE #171507001, and the Japan Society for the Promotion of Science KAKENHI Grant Number 18H03231. This work is partially supported by the National Institute of Information and Communications Technology (NICT), Japan. Publisher Copyright: {\textcopyright} 2020 Optical Society of America under the terms of the OSA Open Access Publishing Agreement.",
year = "2020",
month = jun,
day = "22",
doi = "10.1364/OE.395415",
language = "English",
volume = "28",
pages = "19655--19668",
journal = "Optics Express",
issn = "1094-4087",
publisher = "The Optical Society",
number = "13",
}