Abstract
A subcarrier multiplexing system with the subcarrier frequency at half the baud rate to improve the spectral efficiency is demonstrated. A 12 Gbit/s 4-QAM signal in 9GHz bandwidth was successfully transmitted over a 1 km OM4 MMF 850 nm VCSEL without any equalisation method. The 1.5 dB power penalty was improved compared to an OOK signal at the same data rate.
Original language | English |
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Journal | Electronics Letters |
Volume | 48 |
Issue number | 17 |
Pages (from-to) | 1074-1076 |
ISSN | 0013-5194 |
DOIs | |
Publication status | Published - 2012 |