Optical-Wireless x-Hual Networking

An optical-wireless x-haul experiment has been developed to demonstrate the C-RAN architecture and its integration with the optical x-haul network and SDN control. In particular, the wideband FD radio serves as an FD base station (BS) located at the large node. The FD BS sends baseband IQ data through the core optical switching at the Columbia data center to the colocation side at 32 Avenue of the Americas. It is then sent back to the data center at Columbia for digital signal processing using NI LabVIEW. Simultaneously, a video multicast application operates on the x-haul network on a different optical wavelength. The access point (AP), which needs to dynamically adapt to the channel conditions of several users, receives video streams from two servers through on-demand optical switching managed by a Ryu-based SDN controller. One is received through the short green route (<1 mile distance), and other through the long red route (~14 miles distance). The experiment evaluates the ability of the multicast application to switch between a local and remote cloud servers (via optical support) while responding to the users’ channel states.

The optical paths in an example optical-wireless x-haul experiment

[1] J. Yu, T. Chen, C. Gutterman, S. Zhu, G. Zussman, I. Seskar, and D. Kilper, “COSMOS: Optical architecture and prototyping,” in Proc. OSA OFC’19, M3G.3 (invited), 2019. [download] [slides]

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