Using a dual-drive IQ modulator, we generate 25-Gbaud hexagonal 16-QAM signals. The off-line BER at 32dB optical signal-to-noise ratio (OSNR) is 3.7e-3, the required OSNR is 0.5dB less than that of the square 16-QAM signal.
© 2015 Optical Society of America
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