Free space optical (FSO) communication refers to the information transmission technology based on the propagation of optical signals in space. FSO communication requires that the transmitter and receiver directly see each other. High-altitude platforms (HAPs) have been proposed for carrying FSO transceivers in the stratosphere. A multihop HAP network with FSO links can relay traffic between ground FSO nodes. In this study, we propose an end-to-end switching model for forwarding traffic between massive pairs of ground FSO nodes over a HAP network. A protection mechanism is employed for improving the communication survivability in the presence of clouds, which may break the line of sight (LoS) between HAPs and ground nodes. We propose an algorithm for designing the topology of the survivable HAP network, given a set of ground FSO nodes. The results demonstrate that, even though networks with survivable capacity use more resources, they are not necessary much more expensive than those without survivability in terms of equipment, i.e., HAPs and FSO devices, and in terms of wavelength resource utilization.
翻译:自由空间光学(FSO)通信是指基于空间光学信号传播的信息传输技术。 FSO通信要求发射机和接收器直接见面。高空平台已经建议用于在平流层运载FSO收发器。多霍赫AP网络与FSO链接可以连接地面FSO节点之间的通信。在本研究中,我们提议了一个端对端转换模式,用于在高空网络上传送大量地面FSO节点之间的通信。采用了一种保护机制,在云层存在时改进通信的可生存性,这可能会打破HAPs和地面节点之间的视线。我们提议了一个算法,用于设计可生存的HAP网络的地形学,因为有一组地面的FSO节点。结果表明,即使具有可生存能力的网络使用更多的资源,但就设备而言,即HAPs和FSO装置以及波长资源利用而言,它们不必比那些无法生存的网络更贵得多。