Abstract
We present an all-optical adaptive-antenna radio over fiber transport system that uses
proven, commercially-available components to effectively deliver standard-compliant optical
signaling to adaptive multiantenna arrays for current and emerging radio technology
implementations. The system is based on a directly-modulated reflective semiconductor
amplifier (R-SOA) and exploits the interplay between transmission-line dispersion and tunable
optical filtering to achieve flexible true time delay, with $2\pi$ beam steering at the different antennas. The system was characterized, then
successfully tested with two types of signals defined in IEEE 802.16 (WiMAX) standard for
wireless networks: a 90 Mbps single-carrier signal (64-QAM at 2.4 GHz) and a
78 Mbps multitone orthogonal frequency-division
multiple access (OFDMA) signal. The power budget of this configuration supports a 4-element
antenna array.
© 2009 IEEE
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