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- Title
High-capacity free-space optical communications using wavelength- and mode-division-multiplexing in the mid-infrared region.
- Authors
Zou, Kaiheng; Pang, Kai; Song, Hao; Fan, Jintao; Zhao, Zhe; Song, Haoqian; Zhang, Runzhou; Zhou, Huibin; Minoofar, Amir; Liu, Cong; Su, Xinzhou; Hu, Nanzhe; McClung, Andrew; Torfeh, Mahsa; Arbabi, Amir; Tur, Moshe; Willner, Alan E.
- Abstract
Due to its absorption properties in atmosphere, the mid-infrared (mid-IR) region has gained interest for its potential to provide high data capacity in free-space optical (FSO) communications. Here, we experimentally demonstrate wavelength-division-multiplexing (WDM) and mode-division-multiplexing (MDM) in a ~0.5 m mid-IR FSO link. We multiplex three ~3.4 μm wavelengths (3.396 μm, 3.397 μm, and 3.398 μm) on a single polarization, with each wavelength carrying two orbital-angular-momentum (OAM) beams. As each beam carries 50-Gbit/s quadrature-phase-shift-keying data, a total capacity of 300 Gbit/s is achieved. The WDM channels are generated and detected in the near-IR (C-band). They are converted to mid-IR and converted back to C-band through the difference frequency generation nonlinear processes. We estimate that the system penalties at a bit error rate near the forward error correction threshold include the following: (i) the wavelength conversions induce ~2 dB optical signal-to-noise ratio (OSNR) penalty, (ii) WDM induces ~1 dB OSNR penalty, and (iii) MDM induces ~0.5 dB OSNR penalty. These results show the potential of using multiplexing to achieve a ~30X increase in data capacity for a mid-IR FSO link. A 300-Gbit/s free-space optical communication system is demonstrated in the mid-IR wavelength region by using both wavelength- and mode-division multiplexing.
- Subjects
FREE-space optical technology; WAVELENGTH division multiplexing; OPTICAL communications; FORWARD error correction; SIGNAL-to-noise ratio; ERROR rates
- Publication
Nature Communications, 2022, Vol 13, Issue 1, p1
- ISSN
2041-1723
- Publication type
Article
- DOI
10.1038/s41467-022-35327-w