Journal article
Multilevel intensity modulations for simplified full-duplex millimeter-wave radio-over-fiber system for gigabit access
AHMR Islam, M Bakaul, A Nirmalathas
IEEE Photonics Journal | IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC | Published : 2012
Abstract
Multilevel M-ary amplitude-shift-key (M-ASK) intensity modulation formats have been proposed and experimentally demonstrated in millimeter-wave radio-over-fiber (mm-wave RoF) system. In order to demonstrate multilevel intensity modulation for spectrally efficient implementation, return-to-zero (RZ) and non-RZ (NRZ) implementations for both 4-ASK and 8-ASK modulation formats are utilized in full-duplex RoF link. Hence, for downlink, two different signal generation schemes are utilized in this paper for optical mm-wave generation and transport using optical heterodyning of two unlocked lasers. For uplink, similar RF self-homodyning technique is applied at the base station (BS) to simplify the ..
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Funding Acknowledgements
This work was supported by the National ICT Victoria, Australia, funded by the Australian Government as represented by the Department of Broadband, Communications, and the Digital Economy and the Australian Research Council through the ICT Centre of Excellence program.