We present an optically controlled 60 GHz array antenna which may be used as a smart antenna in an envisaged broadband mobile communication system. The desired field patterns of the antenna were synthesized using the maximum directivity beam-forming algorithm which enables an optimum radio link to a selected mobile terminal to be created while the signals of other terminals are suppressed by the nulls of the antenna's field distribution. The 60 GHz signals were generated by optically heterodyning the signals of two laser diodes. The field distribution of the antenna was formed by a silica based photonic beam-forming network. The experimentally obtained data confirmed the calculated field patterns
Experiments are described using a photonic beam former to control a 60-GHz smart antenna. The 60-GHz signals are generated by optical heterodyning the waves of two laser diodes. Beam forming is achieved by new photonic planar lightwave circuits in silica technology. The beam former enables individual weighting of the millimeter-wave signals feeding the antenna elements. The required weights for a desired field distribution are calculated using the maximum directivity beam-forming algorithm
We demonstrate an L-band InGaAlAs based electroabsorption modulated DFB laser integrated with a semiconductor optical amplifier. The device can be operated with up to 56 Gb s−1 with low chirp and high output power. The device is realized with one common InGaAlAs multi quantum well structure for low fabrication costs and high yield. We describe important aspects of the device structure and present a DC and RF characterization. For the experimental characterization the focus lies on the influence of the integrated semiconductor optical amplifier (SOA) on the device performance
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