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Journal of Lightwave Technology

Journal of Lightwave Technology

| A JOINT IEEE/OSA PUBLICATION

  • Vol. 30, Iss. 17 — Sep. 1, 2012
  • pp: 2757–2763

DFT-Precoded Coherent Optical OFDM With Hermitian Symmetry for Fiber Nonlinearity Mitigation

Minkyu Sung, Sungyong Kang, Jaemin Shim, Jaehoon Lee, and Jichai Jeong

Journal of Lightwave Technology, Vol. 30, Issue 17, pp. 2757-2763 (2012)


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Abstract

Coherent optical orthogonal frequency division multiplexing (CO-OFDM) systems have inferior nonlinear performance due to their high peak to average power ratio (PAPR) characteristics. In order to mitigate fiber nonlinearities for the CO-OFDM systems, we propose a novel discrete Fourier transform (DFT)-precoded coherent optical OFDM combined with a Hermitian symmetry (DFT-precoded HS CO-OFDM) system, which is a combination of the DFT-spread OFDM and the Hermitian symmetry of the DFT. Furthermore, the proposed system can be easily implemented by using a fast Fourier transform (FFT) algorithm. Because the proposed system has a lower PAPR than the conventional CO-OFDM system, the DFT-precoded HS CO-OFDM system provides superior nonlinear tolerance. Moreover, the proposed system is superior to the conventional DFT-spread coherent optical OFDM (DFT-spread CO-OFDM) system in terms of maintaining low PAPR in optical fiber transmission. The low PAPR in the proposed scheme is suitable for long-haul optical transmission systems, compared with the conventional DFT-spread CO-OFDM. For the DFT-precoded HS OFDM system, we have developed a theoretical framework illustrating the principles of the proposed system. The numerical results show that the DFT-precoded HS CO-OFDM system outperforms the conventional CO-OFDM by 5.4% EVM performance after 1200-km transmission and the conventional DFT-spread CO-OFDM by 4.5% EVM performance after 2800-km transmission at a fiber launch power of -2 dBm.

© 2012 IEEE

Citation
Minkyu Sung, Sungyong Kang, Jaemin Shim, Jaehoon Lee, and Jichai Jeong, "DFT-Precoded Coherent Optical OFDM With Hermitian Symmetry for Fiber Nonlinearity Mitigation," J. Lightwave Technol. 30, 2757-2763 (2012)
http://www.opticsinfobase.org/jlt/abstract.cfm?URI=jlt-30-17-2757

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