Advanced Digital Signal Processing for High-Capacity Mode-Division Multiplexed Free-Space Optical Communications
Advanced Digital Signal Processing for High-Capacity Mode-Division Multiplexed Free-Space Optical Communications
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DOI：
10.1109/icton59386.2023.10207300
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发表时间：
2023-07
期刊：
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通讯作者：
Zhouyi Hu;Zhaozhong Chen;Yiming Li;D. Benton;Abdallah A. i. Ali;Mohammed Patel;Martin P. J. Lavery;A. Ellis
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文献类型：
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作者：
Zhouyi Hu;Zhaozhong Chen;Yiming Li;D. Benton;Abdallah A. i. Ali;Mohammed Patel;Martin P. J. Lavery;A. Ellis
空间模式为提高自由空间光通信系统的容量提供了一个潜在的维度。可以使用各种模式基组。对于给定的孔径大小，与不完全模基集相比，完全正交模基集可以提供更高的容量，但对大气湍流等FSO信道损伤更敏感。在这篇受邀的论文中，我们回顾了我们在使用完全模式基集时使用先进的数字信号处理算法来实现大容量模式分割多路复用FSO通信系统的最新进展。除了湍流，商业多路复用器/多路分解器的相对较高的模式间串扰也被考虑在内。通过在发射机侧采用自适应加载和/或在接收机侧采用先进的多输入多输出检测算法，在无湍流和湍流FSO链路上都实现了创纪录的高单波长传输数据速率和频谱效率，其中所有关键设备都是商用的。
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.