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OFDM for Optical Communications by Ivan Djordjevic, William Shieh

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Chapter 6 Coding for Optical OFDM Systems

Orthogonal frequency-division multiplexing (OFDM) is an efficient approach to deal with intersymbol interference (ISI) due to chromatic dispersion and polarization mode dispersion (PMD). By providing that the guard interval is longer than the combined delay spread due to chromatic dispersion (CD) and maximum differential group delay (DGD), the ISI can be successfully eliminated. However, the four-wave mixing (FWM) between different subcarriers and its interplay with CD and PMD will result in different subcarriers being affected differently. Although most of the subcarriers are without errors, the overall bit error ratio (BER) will be dominated by the BER of the worst subcarriers. In order to avoid this ...

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