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Is Optical OFDM a Viable Alternative to Single-Carrier Transmission for Future Long-Haul Optical Systems?

Is Optical OFDM a Viable Alternative to Single-Carrier Transmission for Future Long-Haul Optical Systems?,10.1109/ICC.2010.5502059,A. Barbieri,G. Cola

Is Optical OFDM a Viable Alternative to Single-Carrier Transmission for Future Long-Haul Optical Systems?   (Citations: 1)
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Orthogonal frequency division multiplexing (OFDM) and single-carrier (SC) data transmission are compared as potential candidates for the next generation coherent long-haul 100 Gbps optical communication systems. The comparison takes into account impairments either general or mainly related to coherent detection, e.g., group velocity dispersion (GVD), polarization mode dispersion (PMD), non-linear effects, phase noise due to transmit and receive lasers, uncompensated frequency offset, other synchronization aspects, overall complexity, power and spectral efficiency, technological constraints.
Published in 2010.
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    • ...Besides more general considerations about the debate between SC and OFDM (see [8]), one of the most severe impairment that affects coherent systems employing highorder modulation formats is the presence of phase noise (PN) [9], [10], introduced by both transmit and receive lasers—the former also present in the widespread intensity-modulation direct-detection systems, the latter peculiar to coherent systems...
    • ...In OFDM systems, the effect of PN is even more severe [8] and represents a major comparison aspect between OFDM and SC...
    • ...A schematic block diagram of the system is reported in Fig. 1. The optional differential phase noise estimation (DPNE) blocks are required for the implementation of the novel DCE technique and will be introduced in Section IV. As in [8], in the numerical results we will consider classical differentially encoded quadrature phase-shift keying (QPSK) signals...
    • ...This two-dimensional equalizer is suitably implemented in the frequency domain for complexity-saving purposes [8]...
    • ...Details on one possible OFDM receiver architecture with the relevant algorithms can be found in [8]...
    • ...In this case, the described SC scheme, thanks to the mentioned asynchronous strategies for detection and for the adjustment of the equalizer taps described in [3], exhibits a very good robustness to PN and also the OFDM system, provided that short OFDM symbols are employed, exhibits a limited performance degradation for lasers’ linewidths of practical interest [8]...
    • ...Notice that when the PT is not ideally extracted a loss must be expected and in fact in real conditions SC without PT will outperform OFDM with the PT-based technique [8]...

    Giulio Colavolpeet al. Phase Noise Sensitivity and Compensation Techniques in Long-Haul Coher...

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