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
NASA's ICESat-2 equipped with unique 3-D manufactured part
03.02.2016 | NASA/Goddard Space Flight Center
Energy-saving minicomputers for the ‘Internet of Things’
29.01.2016 | Helmholtz-Zentrum Dresden-Rossendorf
Automobiles increase the mobility of their users. However, their maneuverability is pushed to the limit by cramped inner city conditions. Those who need to...
Advance in biomedical imaging: The University of Würzburg's Biocenter has enhanced fluorescence microscopy to label and visualise up to nine different cell structures simultaneously.
Fluorescence microscopy allows researchers to visualise biomolecules in cells. They label the molecules using fluorescent probes, excite them with light and...
NASA's follow-on to the successful ICESat mission will employ a never-before-flown technique for determining the topography of ice sheets and the thickness of sea ice, but that won't be the only first for this mission.
Slated for launch in 2018, NASA's Ice, Cloud and land Elevation Satellite-2 (ICESat-2) also will carry a 3-D printed part made of polyetherketoneketone (PEKK),...
In the last decades, sea level has been rising continuously – about 3.3 mm per year. For reef islands such as the Maldives or the Marshall Islands a sinister picture is being painted evoking the demise of the island states and their cultures. Are the effects of sea-level rise already noticeable on reef islands? Scientists from the ZMT have now answered this question for the Takuu Atoll, a group of Pacific islands, located northeast of Papua New Guinea.
In the last decades, sea level has been rising continuously – about 3.3 mm per year. For reef islands such as the Maldives or the Marshall Islands a sinister...
The ‘Internet of Things’ is growing rapidly. Mobile phones, washing machines and the milk bottle in the fridge: the idea is that minicomputers connected to these will be able to process information, receive and send data. This requires electrical power. Transistors that are capable of switching information with a single electron use far less power than field effect transistors that are commonly used in computers. However, these innovative electronic switches do not yet work at room temperature. Scientists working on the new EU research project ‘Ions4Set’ intend to change this. The program will be launched on February 1. It is coordinated by the Helmholtz-Zentrum Dresden-Rossendorf (HZDR).
“Billions of tiny computers will in future communicate with each other via the Internet or locally. Yet power consumption currently remains a great obstacle”,...
02.02.2016 | Event News
26.01.2016 | Event News
26.01.2016 | Event News
05.02.2016 | Life Sciences
05.02.2016 | Materials Sciences
05.02.2016 | Physics and Astronomy