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• W2020544007 abstract "To meet the increasing demand to expand wavelength division multiplexing (WDM) transmission capacity, ultrahigh spectral density coherent optical transmission employing multi-level modulation formats has attracted a lot of attention. In particular, ultrahigh multi-level quadrature amplitude modulation (QAM) has an enormous advantage as regards expanding the spectral efficiency to 10bit/s/Hz and even approaching the Shannon limit. We describe fundamental technologies for ultrahigh spectral density coherent QAM transmission and present experimental results on polarization-multiplexed 256 QAM coherent optical transmission using heterodyne and homodyne detection with a frequency-stabilized laser and an optical phase-locked loop technique. In this experiment, Raman amplifiers are newly adopted to decrease the signal power, which can reduce the fiber nonlinearity. As a result, the power penalty was reduced from 5.3 to 2.0dB. A 64Gbit/s data signal is successfully transmitted over 160km with an optical bandwidth of 5.4GHz." @default.
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• W2020544007 date "2011-01-01" @default.
• W2020544007 modified "2023-09-25" @default.
• W2020544007 title "256 QAM Digital Coherent Optical Transmission Using Raman Amplifiers" @default.
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• W2020544007 doi "https://doi.org/10.1587/transcom.e94.b.417" @default.
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