DCT-precoding technique in optical fast OFDM for mitigating fiber nonlinearity

Minkyu Sung, Jaehoon Lee, Jichai Jeong

Research output: Contribution to journalArticlepeer-review

15 Citations (Scopus)


We construct a discrete Fourier transform (DFT)-precoded optical fast orthogonal frequency division multiplexing (FOFDM) system. However, the DFT-precoded FOFDM system requires a higher modulation order (M2) compared with the conventional FOFDM system (M) owing to the complex conjugate data. The higher modulation order results in an increase in the peak-to-average power ratio (PAPR), which degrades the nonlinear tolerance. To overcome this problem, we propose a discrete cosine transform (DCT)-precoded optical FOFDM system. The proposed system does not require a higher modulation order. Therefore, the proposed DCT-precoded optical FOFDM system has a lower PAPR characteristic than the DFT-precoded FOFDM system. The lowest PAPR characteristic of the proposed system enables superior nonlinear tolerance compared with other FOFDM systems. The numerical results show that the proposed system outperforms the conventional FOFDM system by an optical signal-to-noise ratio of 2 dB at 3.8× 10-3~BER for an 800-km transmission.

Original languageEnglish
Article number6607179
Pages (from-to)2209-2212
Number of pages4
JournalIEEE Photonics Technology Letters
Issue number22
Publication statusPublished - 2013


  • Coherent communications
  • fiber-optic transmission systems
  • optical nonlinear effect
  • orthogonal frequency division multiplexing
  • peak to average power ratio

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Atomic and Molecular Physics, and Optics
  • Electrical and Electronic Engineering


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