Prof. Dr. Tibor Berceli
Technical University of Budapest,
The lecture presents the combination of optical and microwave technologies offering new and better approaches for many applications. First the optical-microwave interaction principles are treated. That is followed by optical control of microwave circuits, optical-microwave mixing methods, processing of sub-carrier multiplexed optical signals, integration of wireless and optical techniques.
President Photonic Systems Inc., 900 Middlesex Turnpike, Bldg. 5, Billerica, MA 01821, USA
This presentation gives an introductory overview of analog links: direct and external modulation, figures of merit such as gain, noise figure and dynamic range and applications.
Future generation of communication satellites are based on phased array antennas to generate over 100 simultaneous beams to provide communications services to mobile and fixed terminal users. The feed network operating at Ka-band is a major challenge and optical beam forming networks (OBFN) are considered as a desired technology.
An optoelectronic ultra-wideband RF/wireless communications system is proposed. We refer this new technology as opto-impulse radio. Impulse modulation is a wireless transmission format for multipath and interference environments. It can provide a jam-resistant, high security, low-power RF communications link. Photoconductive (PC) switches are used as front-end elements in wireless impulse communications systems. Direct sequence code division is used to enhance an ultra-wideband impulse modulation communication system. Experimental results show an aggregate processing gain of 44 dB using a 750 MHz spreading bandwidth.
The transmission rate of wireless data in the mobile networks is doubling every year due to the increased usage of mobile multimedia services like streaming video, music, television, data transfer in smartphones and laptop-computers etc. This tendency will require continuously improved telecom infrastructure regarding both base-stations and the backhaul communication links. Today, the E-band (71-76, 81-86, 92-95 GHz) is employed increasingly in the networks, allowing multi Gbps data rate. In a near future however, the E-band will be crowded and novel, higher frequency bands can to be employed as well. Several hundred Gigahertz bandwidth is available for new communication and sensing applications just waiting to be exploited at frequencies above 100 GHz. Until now, components for making such ‘THz-systems’ have been too expensive, too bulky, too power hungry and nonsufficient in terms of generating enough power for communication systems. With newly developed RFIC-processes, it is now possible to design multifunctional integrated circuits, realizing a full ‘frontend on a chip’ at frequencies well beyond 100 GHz. Recent results from ongoing projects aiming at enabling new applications for next generation mobile infrastructure, 5G, and imaging, up to 340 GHz will be reported. So far, critical building blocks such as LNA, PA, VCO, modulator and demodulator, frequency multiplier, power detector and mixer have recently been developed, and results will be reported. Multifunction front-end circuits such as complete receive and transmit RFICs, mixed signal designs for co-integrated baseband/frontend ICs, and radiometer ICs have also been developed and will be reported as well, including the newly developed D-band frontend chipset demonstrating state-of-the-art bitrate of beyond 40 Gbps.