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This work reports the performance of a wireless transmission link based on a radio access unit (RAU) implemented in photonic integrated circuit (PIC) form. The PIC contains a high speed photodiode for direct optical to RF conversion, monolithically integrated with a semiconductor laser, used as an optical local oscillator for up-conversion of the incoming 16-QAM-OFDM signal through heterodyning. Wireless...
Downy mildew, caused by the oomycete pathogen Sclerospora graminicola (Sacc.) Schröet, is economically the most important disease of pearl millet (Pennisetum glaucum (L.) R. Br.) in Asia and Africa. The pathogen induces systemic infection in pearl millet plants that manifests itself through foliar chlorosis and panicle malformation (also called “green-ear” or “crazy top”). The fungus is heterothallic...
This work aims to investigate the performance of millimetre wave (mm-wave) broadband wireless access for seamless integration with the (ultra-dense) WDM infrastructure. By using two uncorrelated lasers at the coherent receiver, a simple implementation is obtained, which can additionally be improved, if thermally uncooled lasers are used. Although such asynchronous receiver design is mildly affected...
. In this work a PON/mm-wave converged topology using single mode fiber (SMF) to multimode fiber (MMF) feeds is addressed supporting 60GHz indoor wireless access, standard PON, and a 60GHz wireless bridge providing a virtual PON extension. Proof-of-concept experiments are performed using a 1.2Gb/s OOK (NRZ) transmission over SMF-MMF-SMF link without or including 60GHz photonic up-conversion to be...
A simple, single mode fiber/ multimode fiber (SMF-MMF) 60GHz radio over fiber scheme using a conventional central launching technique at 1550nm is experimentally evaluated under various indoor OFDM standards at a 5Gb/s bit rate.
This paper presents the performance evaluation of full-standard wireless signals overlay on two access networks: (i) legacy long-reach networks and (ii) next-generation networks using orthogonal frequency division multiplexing (OFDM) modulation. The proposed bundle of full-standard OFDM wireless signals includes broadcast of ETSI EN 300 744 DVB-T signals and multi-format wireless signals 3GPP long-term...
In this work, a simple remote heterodyne envelope detector scheme is proposed employing an O-SSB scheme for application in a converged E-PON/ 60 GHz scenario. The proposed PON-60GHz wireless system topology (Fig. 1) is discussed and an evaluation of this scheme is experimentally demonstrated including i) an OFDM 60 GHz wireless access system using indoor MMF, ordinary DFB lasers & ii) a 60 GHz...
A radio-over-fibre system using coherent optical heterodyne detection scheme is proposed, to achieve seamless integration of a photonic Remote Antenna Unit (RAU) into a Next Generation Dense Wavelength Division Multiplexed Passive Optical Network (NG DWDM-PON). The proposed scheme significantly simplifies the optical mm-wave generation and data recovery as it doesn't require any high-bandwidth modulator...
Fast wavelength switching OFDM transceiver enables the coherent reception of 2-burst channels within a 1dB penalty after 800km transmission. Burst detection and variable path-history compensation are performed using inherent OFDM synchronization symbols and cyclic prefix.
Dielectric material sandwiched between two electrodes in an electrostrictive capacitor sensor plays a very important role in performance of the sensor. The dielectric material to be selected is required to possess good electromechanical properties like high strain, high permittivity etc. Researchers have simplified the standard equation for calculation of electrically induced strain in dielectric...
Many ceramics have been studied due to their importance in the fabrication of multilayer ceramic capacitors and actuators. Potassium Sodium Niobate (K0.5Na0.5NbO3) is one of the most promising candidate of lead free piezoelectric ceramics used in sensors and actuators. K0.5Na0.5NbO3 (KNN) was successfully synthesized by solid state reaction method. X-ray diffraction studies (XRD) confirmed the single...
We present an experimental analysis of the performance of Multiband-Orthogonal Frequency Division Multiplexing (MB-OFDM) Ultra-Wideband (UWB) in the 60-GHz radio band distributed using Radio-Over-Fiber (RoF) techniques. To reduce cost, direct modulation of a commercially-available distributed feedback (DFB) laser is used with optical up-conversion achieved with a Mach-Zehnder modulator (MZM). The...
WiMax is a promising technology for the delivery of last mile wireless broadband access which when combined with fibre access networks can provide cost effective solution for next generation integrated networks. WiMax fibre transmission employing up-conversion techniques by means of external modulation of an optical carrier by LiNbO3 Mach-Zehnder (MZ) modulators has proven to be a reliable approach...
Digital predistortion for an intensity-modulated direct-detection MB-OFDM UWB system is proposed and experimentally demonstrated to compensate for the non-linear transfer characteristics of the utilized Mach-Zehnder modulator and improve system performance.
Over the past three years the BONE Network of Excellence has fostered integration and research collaboration between the leading groups in radio-over fibre (RoF) technologies across Europe as part of the Virtual Centre of Excellence in Access. This paper reports on some of the key technologies to emerge and the Centre's vision of the future. One innovative aspect has been the investigation of radio...
A novel, optical dispersion tolerant millimetre-wave radio-over-fibre system using optical frequency tripling technique with enhanced and selectable sideband suppression is demonstrated. 3 dB RCE penalties for multichannel WiMax transport was recorded after 40 km of fibre.
An IEEE802.16e compliant PON architecture with wavelength band overlay has been demonstrated. Transparent transmission of mobile-WiMAX RF channels over multi-wavelength GPON links, based on FDM, has demonstrated at remote receivers standard WiMAX EVM figures with 1E-11 GPON bit-error-rates.
Off-the-shelf components have been used to demonstrate, for the first time, non-intrusive C-band port discovery/alignment in arrayed-waveguide guide grating (AWG)-based access networks. MB-OFDM tones in the 3.168 to 3.696 GHz band probed AWG band edges using intrinsic VCSEL tunability.
We demonstrate simultaneous operation of FWA, FTTP and FTTCab/DSL solutions over a common passive CWDM ring network platform; verifying the potential coexistence of multiple deployment scenarios for high bandwidth delivery in future access networks.
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