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
Snake-inspired robot uses kirigami to move
22.02.2018 | Harvard John A. Paulson School of Engineering and Applied Sciences
Camera technology in vehicles: Low-latency image data compression
22.02.2018 | Fraunhofer-Institut für Nachrichtentechnik, Heinrich-Hertz-Institut, HHI
A newly developed laser technology has enabled physicists in the Laboratory for Attosecond Physics (jointly run by LMU Munich and the Max Planck Institute of Quantum Optics) to generate attosecond bursts of high-energy photons of unprecedented intensity. This has made it possible to observe the interaction of multiple photons in a single such pulse with electrons in the inner orbital shell of an atom.
In order to observe the ultrafast electron motion in the inner shells of atoms with short light pulses, the pulses must not only be ultrashort, but very...
A group of researchers led by Andrea Cavalleri at the Max Planck Institute for Structure and Dynamics of Matter (MPSD) in Hamburg has demonstrated a new method enabling precise measurements of the interatomic forces that hold crystalline solids together. The paper Probing the Interatomic Potential of Solids by Strong-Field Nonlinear Phononics, published online in Nature, explains how a terahertz-frequency laser pulse can drive very large deformations of the crystal.
By measuring the highly unusual atomic trajectories under extreme electromagnetic transients, the MPSD group could reconstruct how rigid the atomic bonds are...
Quantum computers may one day solve algorithmic problems which even the biggest supercomputers today can’t manage. But how do you test a quantum computer to...
For the first time, a team of researchers at the Max-Planck Institute (MPI) for Polymer Research in Mainz, Germany, has succeeded in making an integrated circuit (IC) from just a monolayer of a semiconducting polymer via a bottom-up, self-assembly approach.
In the self-assembly process, the semiconducting polymer arranges itself into an ordered monolayer in a transistor. The transistors are binary switches used...
Breakthrough provides a new concept of the design of molecular motors, sensors and electricity generators at nanoscale
Researchers from the Institute of Organic Chemistry and Biochemistry of the CAS (IOCB Prague), Institute of Physics of the CAS (IP CAS) and Palacký University...
15.02.2018 | Event News
13.02.2018 | Event News
12.02.2018 | Event News
23.02.2018 | Physics and Astronomy
23.02.2018 | Trade Fair News
23.02.2018 | Life Sciences