2 research outputs found
Photonically-driven Schottky diode based 0.3 THz heterodyne receiver
Photonics-based technologies are key players in a number of emerging applications in the terahertz (THz) field. These solutions exploit the well-known advantages of optical devices, such as ultra-wide tuneability and direct integration with fiber networks. However, THz receivers are mainly implemented by fully electronic solutions, where Schottky barrier diodes (SBD) are the preferred option as detectors and mixers due to their excellent response within the THz range at room temperature, and technological maturity. Here, we demonstrate an SBD-based subharmonic mixer (SHM) at 300 GHz pumped with a photonic local oscillator. The Schottky mixer is a prototype designed and manufactured by ACST GmbH, operating at 270-320 GHz. The local oscillator is generated by photomixing on a high-frequency and high-power uni-travelling-carrier photodiode (UTC-PD), providing enough power to saturate conversion loss. Minimum single-side-band conversion loss of 14.4 dB and a peak dynamic range of 130 dB have been measured. Finally, as a proof of concept we realize an all-photonics-based 5 Gbps wireless bridge, utilizing the optically-pumped SBD mixer. With this work, we prove the feasibility of high-performance hybrid Schottky-photonic THz receivers, incorporating the best of both worlds
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Bipartite networks to enable management of internet core and metro infrastructure
In Telecommunications, core and metro network infrastructure provide high-speed, low-latency internet service to national-level areas. Their optimal operation and management are essential for today's increasing internet service demand. The usual representation of such infrastructure as a complex network considers router stations and other main internet sites as network nodes, connected by links that represent fibre-optic cables. However, this representation comes with important simplifications. One of them is that two nodes are connected by one single link when in reality there are involved multiple links in that connection. This paper explores bipartite networks to model the detail of multiple links connecting two network nodes, zooming-in process. To avoid dimensional complexities, the cable disentangles will only be in place at local sub-networks where the analysis may have a particular focus of interest. For instance, this process will support the decision-making associated to re-routing operations after a traffic anomaly has been detected. To show the efficiency of this multi-resolution network approach, the paper uses the case study of the core and metro infrastructure of one of the major UK internet service providers