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Optical phase-based beamformer using MZM SSB modulation combined with crystal polarization optics and a spatial light modulator |
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| Authors: | T Mengual B Vidal S Blanch L Jofre JM del Cura |
| Institution: | a Nanophotonics Technology Center, Universidad Politécnica de Valencia, Camino de Vera, 46022 Valencia, Spain b Universitat Politècnica de Catalunya, Campus Nord, 08034 Barcelona, Spain c European Space Agency, European Space Research and Technology Centre, Keplerlaan 1, 2200 AG Noordwijk, The Netherlands d SENER, Ingeniería y Sistemas, Aerospace Division, Severo Ochoa, 4, 28760 Tres Cantos, Madrid, Spain |
| Abstract: | The performance of a widely tunable phase-based beamformer for phased array antennas using a new technique to cross-polarized the carrier and the sideband, in order to allow the phase control by means of a spatial light modulator, is experimentally demonstrated. The technique relies on the combination of single sideband amplitude modulation (SSB) using a Mach-Zehnder modulator (MZM) and birefringence (to cross-polarized the carrier and the sideband). The architecture has the potential of controlling multiple independent beams simultaneously. The beamformer feeds an eight elements array showing an insertion loss and a reset speed of around 12 dB and 70 ms, respectively. Far-field antenna patterns between 7.5 GHz and 8.5 GHz for nine elevation angles within a range of ±20° have been measured showing beam steering capability, amplitude distribution weighting as well as multibeam operation. |
| Keywords: | Optical beamforming Microwave photonics Phased array antennas Spatial light modulator Multibeam |
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