Photonic Modulation and Demodulation techniques for Multi-Gb/s Millimetre wave Wireless Links

Los sistemas de radio sobre fibra(Radio Over fibre ROF) ofrecen el ancho de banda y flexibilidad necesario para la generación y distribución de del señales inalámbricas del futuro en una arquitectura de red óptica, que reduce el coste de las redes centralizando el procesado y simplificando la ubicación de la antena (estación de base EB). El uso de sistemas de comunicaciones ópticas como una media de transporte de señales inalámbricas en enlaces RoF reduce el cuello de botella entre los estándares de acceso inalámbrico y cableado en un dominio convergente óptico. Las redes de acceso ópticas están evolucionando con capacidades de hasta 10 Gb/s con el estándard 10GEPON, dejando un cuello de botella entre tecnologías de acceso inalámbrico y óptico. . Eso ha motivado gran esfuerzo de investigación en la generación y distribución de señales inalámbricas de alta capacidad (> 10 Gb/s) basada en RoF. En esta tesis se ha investigado el uso de técnicas fotónicas para la generación , distribución y demodulación de señales inalámbricas moduladas vectorialmente. Esta tesis está principalmente dedicada a la generación de señales inalámbricas espectralmente eficientes como la modulación de fase en cuadratura (QPSK) o modulación de amplitud cuadratura de multinivel (M-QAM). El trabajo presentado en esta tesis está clasificado en dos partes: la primera de ellas trata de las técnicas fotónicas que utilizan señales eléctricas coherente para la generación y demodulación de señales inalámbricas, mientras la segunda parte trata de usar señales ópticas incoherentes. En la primera parte de la tesis, están presentadas diferentes arquitecturas de sistemas y están analizadas numéricamente, y demostradas experimentalmente. Un nuevo concepto denominado "modulación vectorial fotónica" (PVM) es propuesto para la generación de señales inalámbricas con una modulación M-QAM. Basado en esta técnica se presenta la generación de señales de capacidad 10Gb/s con una modulación de QPSK y 16-QAM.Sambaraju -, R. (2010). Photonic Modulation and Demodulation techniques for Multi-Gb/s Millimetre wave Wireless Links [Tesis doctoral no publicada]. Universitat Politècnica de València. https://doi.org/10.4995/Thesis/10251/8857Palanci

16-QAM Photonic Vector Modulator for Gigabit Wireless Links

[ES] Esta Tesina se centra en el uso de técnicas fotónicas aplicadas en los enlaces inalámbricos de alta capacidad en el rango de frecuencias de ondas milimétricas. En concreto, se ha propuesto una nueva técnica llamada modulación vectorial fotónica y se ha estudiado y demostrado experimentalmente la generación de modulación avanzada 16-QAM hasta una capacidad de 10 Gb/s en el rango de frecuencias de ondas milimétricas. Asimismo, se han propuesto y demostrado experimentalmente varias arquitecturas basadas en ciertos dispositivos ópticos para la generación de enlaces inalámbricos de alta capacidad con modulación 16-QAM. Las prestaciones de estas arquitecturas se han evaluado numéricamente.[EN] In this report the use of photonic techniques in the application of high capacity wireless links in the millimeter wave frequency range is addressed. A novel technique called the photonic vector modulation has been proposed, and generation of advanced modulation like 16-QAM upto a capacity of 10 Gb/s in the millimeter wave frequency has been studied and experimentally demonstrated. Several architectures based on certain optical devices, for the generation of such high capacity wireless links with 16-QAM modulation have been proposed and experimentally demonstrated. The performance of these architectures has been numerically evaluated.Sambaraju, R. (2010). 16-QAM Photonic Vector Modulator for Gigabit Wireless Links. http://hdl.handle.net/10251/27340.Archivo delegad

Radio-frequency transparent demodulation for broadband hybrid wireless-optical links

A novel demodulation technique which is transparent to radio-frequency (RF) carrier frequency is presented and experimentally demonstrated for multigigabit wireless signals. The presented demodulation technique employs optical single-sideband filtering, coherent detection, and baseband digital signal processing. Multigigabit wireless signal demodulation of 1.25-Gbaud quadrature phase-shift-keying modulated data at 40- and 35-GHz RF carrier frequency is experimentally demonstrated using the proposed demodulation scheme

Subsystems for future access networks

Current evolution and tendencies of Telecom Networks in general and more specifically optical Metro and Access Networks and their convergence are reported. Based on this evolution, a set of research lines are foreseen regarding subsystems and devices as: high speed optical sources, modulators and receivers, for the next generation of Passive Optical Networks. The ICT project EURO-FOS is achieving European level cooperative research among academia and industry, enabling future telecommunication networks

Real-time ultra-wideband video streaming in long-reach passive optical networks with wireless radiation in the 10 and 60 GHz Bands

This paper was published in Chinese Optics Letters and is made available as an electronic reprint with the permission of OSA. The paper can be found at the following URL on the OSA website: http://www.opticsinfobase.org/col/abstract.cfm?URI=col-11-10-100605 . Systematic or multiple reproduction or distribution to multiple locations via electronic or other means is prohibited and is subject to penalties under law.[EN] Real-time video streaming using ultra-wideband (UWB) technology is experimentally demonstrated along long-reach passive optical networks (LR-PONs) with different wired and wireless reaches. Experimental tests using external and direct modulation with UWB wireless radiation in the 10- and 60-GHz bands are performed. An ultra-bendable fiber is also considered for a last-mile distribution. The video quality at the output of the optical fiber infrastructure of the LR-PON is assessed using the error vector magnitude (EVM), and the link quality indicator (LQI) is used as a figure of merit after wireless radiation. An EVM below -17 dB is achieved for both externally and directly modulated LR-PONs comprising up to 125 km of optical fiber. EVM improvement is observed for longer LR-PONs when directly modulated lasers (DMLs) are used because of the amplitude gain provided by the combined effect of dispersion and DML's chirp. Compared with optical back-to-back operation, the LQI level degrades to the maximum around 20% for LR-PONs ranging between 75 and 125 km of fiber reach and with a wireless coverage of 2 m in the 10-GHz UWB band. The same level of LQI degradation is observed using the 60-GHz UWB band with a LR-PON integrating 101 km of access network, a last-mile distribution using ultra-bendable fiber, and a 5.2-m wireless link.This work was supported by the Fundação para a Ciˆencia e a Tecnologia from Portugal under projects PEst-OE/EEI/LA0008/2013 and TURBO-PTDC/EEATEL/ 104358/2008 and also by the European FIVER-FP7-ICT-2009-4-249142 project.Alves, TMF.; Morant Perez, M.; Cartaxo, AVT.; Llorente Sáez, R.; Cluzeaud, P.; Sambaraju, R. (2013). Real-time ultra-wideband video streaming in long-reach passive optical networks with wireless radiation in the 10 and 60 GHz Bands. Chinese Optics Letters. 11(10):1006051-1006056. https://doi.org/10.3788/col201311.100605S10060511006056111

Carrier Recovery and Equalization for Photonic-Wireless Links with Capacities up to 40 Gb/s in 75-110 GHz Band

Novel robust digital carrier phase/frequency recovery structure is experimentally demonstrated for single carrier and multi-carrier, up to 40Gb/s, photonic-wireless links in 75-110 GHz band. We show that nonlinear equalization also improves system performance