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The required resolution of digital-analog-converter for optical OFDM was evaluated through simulation and experiment. Signal degradation caused by quantization was independent of subcarrier modulation, and the performance improvement saturates with increasing bit resolution.
In this paper the optical performance and complexity of polarization division multiplexed quadrature phase shift keying (PDM-QPSK) is compared to that of PDM orthogonal frequency division multiplexing (PDM–OFDM). The benefits and drawbacks of each modulation format are discussed with respect to the implementation, complexity and transmission performance.
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