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Radio over Fiber systems with embedded antenna for monitoring and process control

Grant number: 08/06380-1
Support type:Research Grants - Innovative Research in Small Business - PIPE
Duration: December 01, 2009 - May 31, 2010
Field of knowledge:Engineering - Electrical Engineering - Telecommunications
Principal researcher:Arismar Cerqueira Sodré Junior
Grantee:Arismar Cerqueira Sodré Junior
Company:R4F Tecnologia em Telecomunicações Ltda
City: Campinas
Assoc. researchers:Marcelo Luís Francisco Abbade ; Omar Carvalho Branquinho


Several emerging technologies may use sensor networks to monitor and control processes. Some examples of these applications include measurements of: a) soil nutrients in agriculture, b) voltage/ current to identify faults in electrical energy distribution networks, c) gas emission to detect leakage from gas/ oil pipes, and others. The IEEE 802.15.4 standard is widely deployed to provide communication between sensors and an access point in the 2.45 GHz band. The data captured by these sensors need to be forwarded to a head-end station that will process the received information and, possibly, make some control decisions. Nevertheless, these head-end stations may be very far from the sensor coverage areas, in such a way that the communication between these entities cannot be performed reliably by means of cables or other wireless technologies. In this case, it is possible to use a radio-over-fiber (RoF) system, where the 2.45 GHz RF signals modulate a laser, are transmitted through an optical fiber- taking advantage of the low loss and high immunity to electromagnetic interference offered by this medium- and, finally are photo-detected at the head-end station site. The goal of this project is to develop and to implement RoF equipment with embedded antennas for this kind of sensor applications. In PIPE Phase 1, we intend to develop an antenna that will be embedded to commercial RoF equipment and to perform an experimental evaluation of this system. The development of the whole system would be performed during Phase 2. To the best of our knowledge, this is an original proposal that should not only improve the system performance but also provide a low-cost solution for the considered scenario. (AU)

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