24 January 2011 Recent progress in coherent optical communication technologies
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High-speed and high-capacity optical transmission systems are being intensively investigated toward the future costeffective optical transport networks (OTN) needed to meet the huge traffic demand expected. Coherent detection with digital signal processing (DSP) is very promising to realize such systems. DSP-based linear equalizers can effectively eliminate the signal distortion caused by chromatic dispersion and polarization mode dispersion which are the main factors limiting the attainable distance of high speed channels over 40 Gb/s. Moreover, their combination with advanced modulation and polarization multiplexing techniques has yielded large capacity and spectrally-efficient transmission experiments. This paper reviews recent progress in coherent communication technologies, with special focus on higher order multi-level modulation such as quadrature amplitude modulation (QAM), and discusses higher speed transmission based on optical multiplexing techniques such as optical orthogonal frequency-division multiplexing (OFDM) toward 400G or 1T channel transport.
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Akihide Sano, Akihide Sano, } "Recent progress in coherent optical communication technologies", Proc. SPIE 7958, Broadband Access Communication Technologies V, 795805 (24 January 2011); doi: 10.1117/12.877243; https://doi.org/10.1117/12.877243


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