Publications by authors named "Ioannis Lazarou"
A novel digital receiver architecture for coherent heterodyne-detected optical signals is presented. It demonstrates the application of bandpass sampling in an optical communications context, to overcome the high sampling rate requirement of conventional receivers (more than twice the signal bandwidth). The concept is targeted for WDM coherent optical access networks, where applying heterodyne detection constitutes a promising approach to reducing optical hardware complexity.
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- The study showcases the experimental implementation of optical quadrature amplitude modulation (QAM) using a simple modulator made from a semiconductor optical amplifier and an electroabsorption modulator.
- It successfully demonstrates flexible transmission formats for both amplitude and phase.
- The research explores the effectiveness of octary QAM in coherent optical access networks, achieving a sustainable bandwidth of 3 Gb/s per user over a long distance of 100 km, even with high network splits.
Objectives: Transcutaneous electrical nerve stimulation (TENS) is primarily used for pain relief. However, evidence is beginning to emerge that TENS may also have a lowering effect on systemic blood pressure (BP). The purpose of this study was to investigate the comparative effects of 2 intensities on pressure pain threshold (PPT) and resting BP in healthy humans, using low-frequency stimulation applied segmentally to the pain site.
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