An optically modulated radio frequency backscatter wireless data link
|dc.identifier.citation||Cantú, H. and Ironside, C. and Romeira, B. and Kelly, A. and Figueiredo, J. 2013. An optically modulated radio frequency backscatter wireless data link, in Proceedings of the 2013 Conference on Lasers and Electro-Optics Europe and International Quantum Electronics Conference (CLEO/Europe-IQEC 2013), 12-16 May 2013, Munich, Germany: IEEE.|
The paper reports on how a technique adapted from Radio Frequency Identity (RFID) tag systems is used to implement a low cost, low energy optical/wireless data link, using inexpensive, off-the-shelf components. We describe how the changes in impedance of an antenna-coupled photo-detector under optical illumination are used to encode binary data into a backscatter radio frequency (RF) wireless signal. The backscatter device consists of an 850 nm VCSEL source (OPTEK OPV302) directly modulated by data at 1 Mbit/s, which illuminates an unbiased photo-detector (Hamamatsu S5973-01) attached to the input port of an omnidirectional antenna. An interrogator is used at the carrier frequency of 1 GHz in order to extract the information from the modulated backscatter RF signal. The system is illustrated in Fig. 1. The pseudo-random bit sequence data (non-return to zero, 1.6 Vpp) is downloaded into an arbitrary waveform generator (AWG) that amplitude modulates the laser source illuminating the antenna-coupled photo-detector (Fig.1a). A spectrum analyser is used to monitor the spectral components of the backscatter carrier at 1 GHz (Fig. 1b), which is received and de-modulated (AD8347) by the interrogator placed at a distance (d) from the antenna-coupled photo-detector (Fig. 1c).
|dc.title||An optically modulated radio frequency backscatter wireless data link|
|dcterms.source.title||Optics InfoBase Conference Papers|
|dcterms.source.series||Optics InfoBase Conference Papers|
|curtin.department||Department of Physics and Astronomy|
|curtin.accessStatus||Fulltext not available|