The ability to control the speed and polarisation of light pulses will allow for faster data flow in optical networks of the future. Optical delay and switching have been achieved using slow-light techniques in various media, including atomic vapour. Most of these vapour schemes utilise resonant narrowband techniques for optical switching, but suffer the drawback of having a limited frequency r...

While telecommunication networks have historically been dominated by a circuitswitched paradigm, the last decades have seen a clear trend towards packetswitched networks. In this paper we evaluate how both paradigms (which have also been referred to as optical bypass and non-bypass, respectively) perform in optical backbone networks from a power consumption point of view, and whether the genera...

Key management plays fundamental role in research on security service in wireless sensor networks (WSNs). However, due to the resource constraints, establishing pairwise keys in WSNs is not a trivial tasks. Several exiting key management schemes have been proposed in literature to establish pairwise keys between sensor nodes, but they either can not offer strong resilience against node capture ...

This paper analyzes how customers’ heterogeneous search and switching habits affect the prices paid for telecommunication services in a context which operators use price discrimination strategies to retain their customers attract those of rivals. Drawing on representative sample Spanish households (N=3,113), we show that engaged consumers pay 9.4% less than completely unengaged services, after ...

In this study, a robust controller for voltage regulation of the POESLL converter worked in continuous conduction mode is presented. POESLL converter is a DC/DC converter with a high voltage gain. DC/DC converters are used in telecommunication systems, power sources and industrial applications. Owing to the switching operation, the structure of the POESLL converter is highly non-linear. In addi...

Encircling an exceptional point (EP) in a parity-time (PT) symmetric system has shown great potential for chiral optical devices, such as mode switching and anti-symmetric modes. However, the polarization states never been reported although manipulation significant applications imaging, sensing, communication etc. Here inspired by anti-PT symmetry, we demonstrate on-chip polarizer constructing ...