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Nonlinear Electrical Compensation for the Coherent Optical OFDM System

Nonlinear Electrical Compensation for the Coherent Optical OFDM System,10.1109/JLT.2010.2098017,IEEE/OSA Journal of Lightwave Technology,Jie Pan,Chi-H

Nonlinear Electrical Compensation for the Coherent Optical OFDM System   (Citations: 2)
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A main drawback of Coherent Optical Orthog- onal Frequency Division Multiplexing (CO-OFDM) system is its sensitivity to fiber nonlinearity. Nonlinear electrical equal- izer based on Volterra model has been demonstrated capable of compensating fiber nonlinear distortion in an OOK or PSK optical communication system. However, the implementation complexity of a Volterra model based electrical equalizer prohibits its deployment in a real-life CO-OFDM system. In this paper, we demonstrate that the number of kernels of a Volterra model based equalizer can be significantly reduced using the modified Gram-Schmidt method with reorthogonalization techniques. The resulting "sparse" Volterra model based electrical equalizer and the electrical equalizer based on the "full" Volterra model have comparable performance and can compensate intra-channel nonlinearity of a 16-QAM 100 Gbit/s CO-OFDM System.
Journal: IEEE/OSA Journal of Lightwave Technology - J LIGHTWAVE TECHNOL , vol. 29, no. 2, pp. 215-221, 2011
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    • ...To compensate nonlinear fiber distortions, electrical equalization techniques based on Volterra model are widely studied by the research community [1]–[12]...
    • ...The Volterra model has been used to model the optical communication system nonlinearity [3]–[7], to mitigate nonlinearity effects in optical communication systems [8], and to design equalizers for optical communication systems with ON–OFF keying, phase-shift keying, and quadrature amplitude modulations (QAM) [1], [6], [9]–[12]...
    • ...In our previous works, we successfully reduced the number of coefficients of a Volterra model based electrical equalizers for a wavelength division multiplexing coherent optical orthogonal frequency division multiplexing (CO-OFDM) system; however, the equalizer structure is still complicated and might be difficult to implement [12]...
    • ...Although the electrical equalizer for single channel cannot not compensate interchannel nonlinearity such as cross-phase modulation, our previous research works show that such an electrical equalizer still can improve the performance of a WDM system [12]...
    • ...Several researchers have demonstrated that a third-order Volterra model is sufficient to model the nonlinear optical channel [9]–[12]...

    Jie Panet al. Wiener–Hammerstein Model Based Electrical Equalizer for Optical Commun...

    • ...The Volterra paradigm [7] has been used to model the optical communication system nonlinearity [8]–[12], to mitigate nonlinearity effects in optical communication systems [13], and to design electrical equalizers for optical systems [11], [14]–[18]...
    • ...Although the developed electrical compensators are designed for single channel OFDM system, our previous works demonstrate that such a compensator can still improve a wavelength division multiplexing OFDM system’s performance [18]...
    • ...It has been shown that a third-order bandpass Volterra system is capable of modeling and compensating a coherent optical communicationsystem[8],[18].Ourgoalistoobtainthethird-order inverse system of the third-order bandpass Volterra system...
    • ...We applied the CO-OFDM system simulation setup used in our previous electrical equalizer research work in this equalization/predistortion study [18]...
    • ...PAN AND CHENG: NONLINEAR ELECTRICAL PREDISTORTION AND EQUALIZATION 2787 Fig. 2. Block diagram of CO-OFDM [18]...
    • ...the CO-OFDM system described in the previous section [18]...

    Jie Panet al. Nonlinear Electrical Predistortion and Equalization for the Coherent O...

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