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Study and Performance Evaluation of Nonlinear Compensation Methods in Coherent Optical OFDM Systems

Hassani Shoreh, Morteza | 2012

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 45079 (05)
  4. University: Sharif University of Technology
  5. Department: Electrical Engineering
  6. Advisor(s): Salehi, Javad
  7. Abstract:
  8. In this thesis, we model and analyze coherent optical OFDM systems which are highly concerned as future fiber optic communication. To this end, we first introduce various applications of that in optical communication systems and investigate its probes and cones. In the rest of the thesis, we characterize the mathematical structure of the nonlinear phase noise and discuss the previous methods of compensation of that and propose some new ways of nonlinear phase noise compensation and equalization. And as we discuss each method we also investigate its computational complexity and BER performance. We propose three new phase noise compensation method, considering optical phase conjugation, we discuss the performance improvement of using more than one optical phase conjugate module and show that it leads to a much better BER performance, we also propose the idea of using block turbo equalizer that uses channel matrix and equalize the entire OFDM symbol jointly and discussing its complexity and performance. At the end we introduce low complexity phase compensator. And show that by some simple mathematics in transmitter or receiver we can improve BER performance
  9. Keywords:
  10. Compensation ; Nonlinearities ; Phase Noise ; Orthogonal Frequency Division Multiplexing (OFDM) ; Optical Phase Conjugation ; Four Wave Mixing

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