University of Twente Student Theses


Modelling, simulation and impelementation of an optical beam forming network control software system

Galen, J. van (2009) Modelling, simulation and impelementation of an optical beam forming network control software system.

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Abstract:Beam shaping and beam steering, together called beam forming, is needed when processing the radio frequency signals received by a Phased Array Antenna (PAA). When correcting the arrivaltime differences between all the inputs of the PAA by adding small delays, and subsequently combining them, a strong signal can be obtained. At the Chair for Telecommunication Engineering (TE) at the University of Twente, research is done on achieving these delays fully in the optical domain using an Optical Beam Forming Network (OBFN). With an OBFN, very large bandwidths can be delayed continuously, and is thus suitable for high bandwidth applications like live television reception. The OBFN is based on thermo-optical tuning of Optical Ring Resonators (ORRs), where each ORR is capable of delaying a small fraction of the bandwidth of the signal continuously. The exact frequency range and the amount of delay are controlled by applying a voltage to small heater elements on top of the ORRs according to calculated ring settings. By combining more ORRs into a delay element, larger bandwidths can be delayed. Because of the large amount of heater elements, and the influence that one heater element has on another, a sophisticated control system is needed that is capable of automatically calculating the correct settings, and tuning all the heater elements given only the direction of arrival of the incoming satellite signal.
Item Type:Essay (Master)
Faculty:EEMCS: Electrical Engineering, Mathematics and Computer Science
Subject:54 computer science
Programme:Internet Science and Technology MSc (60032)
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