With increasing numbers of information-based interactions among humans, machines and objects, especially as new services, new terminals and new needs emerge, the networks are required to provide flexible, energy-efficient, safe and broadband access services anywhere at any time, and therefore wideband and ubiquitous information access has become the great demand of the modern information society.
However, it is difficult to meet the growing demand with the existing technologies, so new solutions must be explored as a matter of urgency. The intelligent radio-over-fiber (I-ROF) system, which combines the advantages of flexible wireless access and fiber-optic broadband transmission, uses the methods of microwave photonics to realize the generation of multi-band, multi-standard microwave signals in the optical domain, along with broadband processing, large dynamic transmission, fast access and reconfigurable networking, and can thus provide an effective way to achieve broadband and ubiquitous access.
With the support of the National Program for Key Basic Research Project of China (973 Program, Grant No. 2012CB315705) and the National High-Tech R&D Program of China (863 Program, Grant No. 2011AA010306), a research group led by Professor Ji YueFeng, who is with Beijing University of Posts and Telecommunications and who is also the Chief Scientist of the National 973 Program, have focused on I-ROF systems and have studied the fundamental principles, network architecture and enabling technologies of I-ROF systems from the viewpoints of the required modules, system applications and networking. Also, a broadband access and ubiquitous sensing oriented, large dynamic, reconfigurable, and distributed I-ROF system experimental platform has been built to realize broadband wireless access applications. The group's work, entitled "Large dynamic, reconfigurable, distributed intelligent radio-over-fiber (I-ROF) system", was published in SCIENCE CHINA Information Sciences, 2012, vol. 42 (10).
The research group focused on the large demand for broadband access and for ubiquitous sensing for the Internet of Things and other applications, and proposed a large dynamic and reconfigurable distributed I-ROF system, which can meet this great demand. Also, the fundamental principles, network architecture and enabling technologies for these I-ROF systems in terms of modules, system applications and networking have also been studied. From the viewpoint of the modules, broadband and multi-standard microwave/millimeter-wave band vector signal generation, instantaneous photonic microwave frequency measurements, broadband and tunable microwave photonic filters based on photonic crystals, and broadband, high efficiency electromagnetic band gap structured antennas were investigated. For system applications, a large dynamic ROF system, a cognitive, collaborative and power efficient ROF system, and an optical and wireless resources joint management I-ROF system were covered. For networking, the network architecture of the I-ROF and the media access control (MAC) protocol for the distributed ROF network were studied. Based on the results of these studies, a broadband access and ubiquitous sensing oriented, large dynamic, reconfigurable, and distributed I-ROF system experimental platform was built to realize broadband processing of multi-band, multi-standard microwave signals in the optical domain, large-scale dynamic transmission and reconfigurable networking.
This new generation of I-ROF systems is typically representative of microwave photonics, which is broadband and oriented toward ubiquitous information access, and has the advantages of broadband operation over the full frequency band, a reconfigurable architecture and easy scalability. It also allows low operational energy consumption. I-ROF is therefore an appropriate direction for future development and has broad application prospects.
See the article: Ji Y. F., Xu K., Tian H. P., Wang H. X. Large dynamic, reconfigurable, distributed intelligent radio-over-fiber (I-ROF) system [J]. Scientia Sinica Informationis, 2012, 42(10): 1204-1216.
Yan Bei | EurekAlert!
Further reports about: > Broadband > Energy-efficient > I-ROF > Large Hadron Collider > ROF > broadband processing > enabling technologies > fiber-optic broadband transmission > information access > intelligent radio-over-fiber (I-ROF) system > large-scale dynamic transmission > microwave signals > multi-standard microwave signals > photonic crystal > tunable microwave photonic filters
Micropatterning OLEDs using electron beam technology
27.04.2016 | Fraunhofer-Institut für Organische Elektronik, Elektronenstrahl- und Plasmatechnik FEP
Quantum computing closer as RMIT drives towards first quantum data bus
18.04.2016 | RMIT University
Using an ultra fast-scanning atomic force microscope, a team of researchers from the University of Basel has filmed “living” nuclear pore complexes at work for the first time. Nuclear pores are molecular machines that control the traffic entering or exiting the cell nucleus. In their article published in Nature Nanotechnology, the researchers explain how the passage of unwanted molecules is prevented by rapidly moving molecular “tentacles” inside the pore.
Using high-speed AFM, Roderick Lim, Argovia Professor at the Biozentrum and the Swiss Nanoscience Institute of the University of Basel, has not only directly...
If a person pushes a broken-down car alone, there is a certain effect. If another person helps, the result is the sum of their efforts. If two micro-particles are pushing another microparticle, however, the resulting effect may not necessarily be the sum their efforts. A recent study published in Nature Communications, measured this odd effect that scientists call “many body.”
In the microscopic world, where the modern miniaturized machines at the new frontiers of technology operate, as long as we are in the presence of two...
Researchers from the Max Planck Institute Stuttgart have developed self-propelled tiny ‘microbots’ that can remove lead or organic pollution from contaminated water.
Working with colleagues in Barcelona and Singapore, Samuel Sánchez’s group used graphene oxide to make their microscale motors, which are able to adsorb lead...
Neutron scattering and computational modeling have revealed unique and unexpected behavior of water molecules under extreme confinement that is unmatched by any known gas, liquid or solid states.
In a paper published in Physical Review Letters, researchers at the Department of Energy's Oak Ridge National Laboratory describe a new tunneling state of...
Honeycomb structures as the basic building block for industrial applications presented using holo pyramid
Researchers of the Alfred Wegener Institute (AWI) will introduce their latest developments in the field of bionic lightweight design at Hannover Messe from 25...
27.04.2016 | Event News
15.04.2016 | Event News
12.04.2016 | Event News
04.05.2016 | Physics and Astronomy
04.05.2016 | Physics and Astronomy
04.05.2016 | Materials Sciences