Free-space optical communications
Free-space optical communications
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DOI：
10.1109/jlt.2006.885252
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发表时间：
2006-12-01
影响因子：
4.7
通讯作者：
Chan, Vincent W. S.
中科院分区：
文献类型：
--
作者：
Chan, Vincent W. S.
随着最近自由空间光通信的实验室、大气层和空间演示的成功，毫无疑问，该技术已准备好进行业务部署。虽然这些成功表明，不存在反对这种系统的物理定律，但它们的估计系统成本仍然太高，无法认真考虑。两种类型的开发可以大大降低成本。首先是通过使用真空通道的光子计数接收器将物理链路通信效率提高一个数量级，可以大大降低空间系统的系统复杂性，重量和功率。第二种是通过在晴空湍流损害通信效率的链路中以及在相干处理可以降低干扰水平的多址应用中使用相干系统，可以实现系统成本的显著降低。
With recent successes of laboratory, inatmosphere, and space demonstrations of free-space optical communications, there is no doubt that the technology is ready for operational deployment. While these successes have shown that there are no laws of physics against such systems, their estimated system costs are still much too high for serious considerations. Two types of development can reduce the cost dramatically. The first is via the improvement of physical-link communication efficiency by an order of magnitude using photon-counting receivers for vacuum channels, system complexity, weight, and power for space systems can be greatly reduced. The second is through the use of coherent systems in links where clear-air turbulence impairs communication efficiency, and in multiple access applications where coherent processing can reduce the level of interference, significant reduction in system costs can be realized.