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In this paper a practical application of an electrooptical communication system based on external modulation is reported. The sixteen ATSC TV-channels located at 2.4 GHz, were transmitted over a 30 km of standard optical fiber. The transmitted TV-signal uses Single-Side Band Full Carrier (SSBFC) modulation, allowing in this way an adequate management of the transmitted power and the bandwidth. The...
This work describes an electro-optical system capable to transmit a wireless reference signal of 0.915 GHz using the Radio-over-Fiber technique. The reference signal is supplied by a RF multiband transceiver, sensed by an antenna, and coded on the filtered microwave band-pass windows situated at 2.31 GHz, 4.62 GHz, and 6.86 GHz. Mixing the reference signal with an analog microwave signal, the resulting...
A particular Full-Duplex microwave photonic filter is proposed and simulated. The main goal of this work is to demonstrate that filtering effect is formed in a bi-directional way by using a single optical source. The series of simulations carried out allow establishing the optimal conditions for a practical implementation of this architecture in an optical communication system with a high degree of...
We experimentally demonstrate the generation and distribution of a microwave signal by using an optoelectronic oscillator. This system can be easily configured to generate microwave signals tuned over a very broad frequency range by selecting an appropriate optical delay. Experimental results show a good signal-to-noise-ratio at 4.1GHz.
This work describes a microwave photonic filter (MPF) that exhibits five band-pass windows at multiples of 2.0GHz into the frequency range of 0.1–12GHz. A novel electrical microwave band-pass filter (BPF) is designed and fabricated to operate at 4.0GHz. The fabricated BPF exhibits a compact size, low losses, high selectivity and high spurious frequency; these characteristics permit its inclusion into...
This paper is focused on the development of one methodology to assign the corresponding goal position for a group of vehicles in a proper manner, starting from any initial configuration and one established formation shape. The assignment methodology will guarantee that the formation will be reached in a minimum period of time and without collision risk. Hungarian algorithm was used as combinatorial...
Cadmium sulfide (CdS) nanospheres were successfully synthesized by chemical bath deposition (CBD) in the systems cadmium nitride tetrahydrate (Cd(NO3)2.4H2O) — thiourea (NH2CSNH2) — complexing agent — pH buffer. An L9 Taguchi experimental design was used with the purpose of determines the processing conditions to promote CdS nanospheres formation. For that reason, the processing parameters were varied...
Several diode designs to satisfy specific needs of quick response and power, this paper examines the arguments of a design that is economical in terms of manufacturing process but to improve the requirements of the few devices on the market with these characteristics (reverse breakdown voltage of 600V and reverse recovery time of 35ns). The design is tested using finite elements-through simulation...
We show a hybrid fiber-radio system incorporating optical microwave generation, wireless transmission, and optical long haul transmission. Microwave signal generation is achieved by using optical heterodyne technique in the frequency range of 0.1–4.0 GHz. The microwave signal obtained is used as demodulated signal as well as electrical carrier. Microwave signal is mixed with a TV-signal, and used...
In this paper we use optical heterodyne as an alternative technique to measure reflected power of antennas. As a way to show the effectiveness of our proposal, results of the measurements obtained with the proposed technique are compared with to that obtained when the tracking generator of the spectrum analyzer on the band from 0 to 3 GHz is used.
A microwave photonic filter based on a Sagnac fiber loop is presented. The frequency response is obtained by phase modulating the clockwise and counterclockwise propagating optical signals inside the Sagnac loop at different times. Experimental results match closely with the theoretical analysis. Finally two schemes for transmission process are proposed to demonstrate its application on optical telecommunications...
The low-loss wide-bandwidth capability of optoelectronic systems makes them attractive for the transmission and processing of microwave signals through optical fiber communication systems. In this paper we report a communication system that allows transmitting information point to point using microwave carriers generated with optoelectronic schemes. The generation of microwave signals with this technique...
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