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A new polarization constellation diagram leads to polarization QAM modulation formats. At 28 Gband (112 Gb/s) POL-QAM 6-4 with six QPSK modulated states-of-polarization enables 1.7-dB higher sensitivity than PDM-QPSK by applying coded-modulation with an inner RS(511,455) FEC.
Experimental PMD mitigation at 40Gbit/s by distributed fast polarization scrambling was successfully demonstrated with 40Gbit/s standard and enhanced FECs. 5 scramblers enabled a mean DGD tolerance between 9 to 11.7ps.
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