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OFDM for Optical Communications by Ivan Djordjevic, William Shieh

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Chapter 8 Spectrally Efficient High-Speed Coherent OFDM System

8.1 Introduction

Among all the variants of optical orthogonal frequency-division multiplexing (OFDM) systems, as we illustrated in Chapter 7, coherent optical OFDM (CO-OFDM) offers the ultimate performance in spectral efficiency, receiver sensitivity, and polarization or chromatic dispersion tolerance. The incorporation of the 2 × 2 multiple-input multiple-output OFDM (MIMO-OFDM) opens avenues for doubling the spectral efficiency while providing polarization dispersion and rotation robustness. This has become very attractive in light of the push for 100 Gb/s Ethernet, for which compliance to the 50 GHz ITU grid is critical. Since the conception of CO-OFDM, experimental and theoretical ...

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