Beaconless Auto-Alignment for Single-Wavelength 5 Tbit/s Mode-Division Multiplexing Free-Space Optical Communications
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arXiv
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| Autori principali: | , , , , , |
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| Natura: | Preprint |
| Pubblicazione: |
2024
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| _version_ | 1866929367885545472 |
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| author | Li, Yiming Fernandes, Gil Benton, David Billaud, Antonin Patel, Mohammed Ellis, Andrew |
| author_facet | Li, Yiming Fernandes, Gil Benton, David Billaud, Antonin Patel, Mohammed Ellis, Andrew |
| contents | Mode-division multiplexing has shown its ability to significantly increase the capacity of free-space optical communications. An accurate alignment is crucial to enable such links due to possible performance degradation induced by mode crosstalk and narrow beam divergence. Conventionally, a beacon beam is necessary for system alignment due to multiple local maximums in the mode-division multiplexed beam profile. However, the beacon beam introduces excess system complexity, power consumption, and alignment errors. Here we demonstrate a beaconless system with significantly higher alignment accuracy and faster acquisition. This system also excludes excess complexity, power consumption, and alignment errors, facilitating simplified system calibration and supporting a record-high 5.14 Tbit/s line rate in a single-wavelength free-space optical link. We anticipate our paper to be a starting point for more sophisticated alignment scenarios in future multi-Terabit mode-division multiplexing free-space optical communications for long-distance applications with a generalised mode basis. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2405_20723 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Beaconless Auto-Alignment for Single-Wavelength 5 Tbit/s Mode-Division Multiplexing Free-Space Optical Communications Li, Yiming Fernandes, Gil Benton, David Billaud, Antonin Patel, Mohammed Ellis, Andrew Optics Signal Processing Mode-division multiplexing has shown its ability to significantly increase the capacity of free-space optical communications. An accurate alignment is crucial to enable such links due to possible performance degradation induced by mode crosstalk and narrow beam divergence. Conventionally, a beacon beam is necessary for system alignment due to multiple local maximums in the mode-division multiplexed beam profile. However, the beacon beam introduces excess system complexity, power consumption, and alignment errors. Here we demonstrate a beaconless system with significantly higher alignment accuracy and faster acquisition. This system also excludes excess complexity, power consumption, and alignment errors, facilitating simplified system calibration and supporting a record-high 5.14 Tbit/s line rate in a single-wavelength free-space optical link. We anticipate our paper to be a starting point for more sophisticated alignment scenarios in future multi-Terabit mode-division multiplexing free-space optical communications for long-distance applications with a generalised mode basis. |
| title | Beaconless Auto-Alignment for Single-Wavelength 5 Tbit/s Mode-Division Multiplexing Free-Space Optical Communications |
| topic | Optics Signal Processing |
| url | https://arxiv.org/abs/2405.20723 |