Impact of Frequency Shift on Nonlinear Compensation Using Optical Phase Conjugation for M-QAM Signals

  • Nguyen Duc Binh Le Quy Don University
  • Nguyen Van Dien The University of Danang - University of Science and Technology
  • Nguyen The Quang
  • Nguyen Quang Nhu Quynh The University of Danang–University of Science and Technology, Danang, Vietnam
  • Ho Phuoc Tien The University of Danang–University of Science and Technology, Danang, Vietnam
  • Nguyen Van Tuan The University of Danang - University of Science and Technology
  • Nguyen Tan Hung The University of Danang - University of Science and Technology
DOI: https://doi.org/10.21553/rev-jec.237

Abstract

Nonlinear compensation using optical phase conjugation (OPC) have been considered a promising technique to increase the reach of high-speed fiber-optic transmission systems. OPC-based nonlinear compensation employs an optical phase conjugation located at a middle of the fiber link to generate a complexed conjugated signal with respect the signal in the first half of the link for propagation in the second half. OPC technique assumes a symmetry for signal propagating in the first and second half to obtain a perfect nonlinear and chromatic dispersion. However, as most of practical OPC schemes are realized by nonlinear effects such as four-wave mixing or a combination of second-harmonic generation and difference frequency generation, the frequency shift induced by OPC affects the signal symmetrical requirement for nonlinear compensation because the chromatic dispersion is different for the first and second half transmissions. In this paper, we investigate the impact of frequency shift on the nonlinear compensation using OPC for high symbol rate, high level modulation format signals. This will be important to understand the tolerance of the OPC techniques against such a practical condition for actual system implementations.
Published
2020-01-09
Issue
Vol. 9, No. 3-4 (Jul-Dec, 2019)
Section
Regular articles
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