Abstract
We experimentally demonstrate the best known 16-ary 4-d modulation format at 24.8 Gb/s using coherent optical OFDM, achieving 0.58 dB OSNR gain over PDM-QPSK at a SER of 10−2. With 7% overhead optimal codes, a 0.38 dB gain is theoretically achievable.
© 2013 Optical Society of America
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