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Design Considerations and Performance Comparison of High-Order Modulation Formats using OFDM

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Author(s): Abdulamir Ali | Jochen Leibrich | Werner Rosenkranz

Journal: Journal of Networks
ISSN 1796-2056

Volume: 7;
Issue: 5;
Start page: 757;
Date: 2012;
Original page

Keywords: optical communications | modulation | QAM | OFDM | direct detection | WDM

ABSTRACT
This paper addresses OFDM transmission over optical links with high spectral efficiency, i.e. by using highorder QAM-modulation schemes as a mapping method prior to the OFDM multicarrier representation. Low and moderate cost optics which is mandatory in access and in metro applications is assumed. Here we address especially direct detection receivers using photo detectors without the need for local lasers at the transmitter side. In addition, we show 32ยด10.7 Gb/s optical WDM-OFDM over 3200km SSMF with direct detection.
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