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
Stanford researchers create new special-purpose computer that may someday save us billions
21.10.2016 | Stanford University
New 3-D wiring technique brings scalable quantum computers closer to reality
19.10.2016 | University of Waterloo
Researchers from the Institute for Quantum Computing (IQC) at the University of Waterloo led the development of a new extensible wiring technique capable of controlling superconducting quantum bits, representing a significant step towards to the realization of a scalable quantum computer.
"The quantum socket is a wiring method that uses three-dimensional wires based on spring-loaded pins to address individual qubits," said Jeremy Béjanin, a PhD...
In a paper in Scientific Reports, a research team at Worcester Polytechnic Institute describes a novel light-activated phenomenon that could become the basis for applications as diverse as microscopic robotic grippers and more efficient solar cells.
A research team at Worcester Polytechnic Institute (WPI) has developed a revolutionary, light-activated semiconductor nanocomposite material that can be used...
By forcefully embedding two silicon atoms in a diamond matrix, Sandia researchers have demonstrated for the first time on a single chip all the components needed to create a quantum bridge to link quantum computers together.
"People have already built small quantum computers," says Sandia researcher Ryan Camacho. "Maybe the first useful one won't be a single giant quantum computer...
COMPAMED has become the leading international marketplace for suppliers of medical manufacturing. The trade fair, which takes place every November and is co-located to MEDICA in Dusseldorf, has been steadily growing over the past years and shows that medical technology remains a rapidly growing market.
In 2016, the joint pavilion by the IVAM Microtechnology Network, the Product Market “High-tech for Medical Devices”, will be located in Hall 8a again and will...
'Ferroelectric' materials can switch between different states of electrical polarization in response to an external electric field. This flexibility means they show promise for many applications, for example in electronic devices and computer memory. Current ferroelectric materials are highly valued for their thermal and chemical stability and rapid electro-mechanical responses, but creating a material that is scalable down to the tiny sizes needed for technologies like silicon-based semiconductors (Si-based CMOS) has proven challenging.
Now, Hiroshi Funakubo and co-workers at the Tokyo Institute of Technology, in collaboration with researchers across Japan, have conducted experiments to...
14.10.2016 | Event News
14.10.2016 | Event News
12.10.2016 | Event News
21.10.2016 | Health and Medicine
21.10.2016 | Information Technology
21.10.2016 | Materials Sciences