With the rise of 5G and beyond, ever-increasing data-rates demanded by mobile access are severely challenging capacity optical fronthaul networks. Despite its high reliability ease deployment, legacy digital radio-over-fiber (RoF) technologies face an upcoming bandwidth bottleneck in short term. This has motivated a renewed interest development analog RoF alternatives, owing to their spectral e...

This paper proposes a dynamic digital channel filtering method based on wavelet packet algorithm to realize a simplified and efficient multi-mode & multi-service software radio receiver which can provide the functions of several systems as well as several services simultaneously via one handset. The method can extract several different bandwidth signals adaptively, for the change of service bei...

We have developed some low-cost predistortion circuits to compensate secondand third-order laser distortions in multiservice radio-over-fiber industrial systems. Depending on the predistorter configuration implemented, average reductions of 10–15 dB and of 8–10 dB have been observed in the laser secondand third-order distortions, respectively, within the cellular bands relevant to the European ...

Abstract Quantum Cascade Lasers (QCLs) as Terahertz (THz) frequency sources offer a potentially viable solution for new applications in mid and far-infrared bands. This research work exhaustively investigates the temperature dependence on impedance of dependent operating at 116μm, first time. In 90-stage QCL considered work, cold finger is varied from 15K to 45K. When device biased 0.6A current...

-Radio-over-Fibre (RoF) is an optical communication technique based on the transmission of standard wireless radio signals though optical Fibre in their native format. The optical Fibre provides a huge bandwidth that can support a variety of wireless systems, regardless of their frequency bands, being protocol-transparent which is reflected in great network flexibility. Radio-overFibre techniqu...

Network architectural changes to satisfy all the 5G+ mobile network specifications and requirements are necessary due popularization of streaming cloud applications on omnipresent portable devices. The combination massive installation micro-cell antenna sites with access radio (C-RAN) architecture has recently been nominated as a promising technology for high-capacity fronthaul links, albeit at...

This article presents a novel and cost-effective vector network analyzer (VNA)-based phase-compensated channel sounder operating in the frequency range of 10–50 GHz using radio-over-fiber (RoF) techniques, which can support multilink/channel long-range phase-coherent measurements. The optical cable enables measurements with dynamic 115.7 dB at 30 (for back-to-back connection). phase compensatio...

This paper outlines an approach to optical feedforward linearisation technique to reduce nonlinear distortion generated by a directly modulated semiconductor laser diode for Wireless Local Area Network (WLAN) operating in the Industrial Scientific -Medical (ISM) band 2.4 GHz (IEEE802.11b) for Radio over Fibre (RoF). Various linearization techniques are reviewed. Results with feedforward lineari...