Optical mitigation of interchannel crosstalk for multiple spectrally overlapped 20-GBd QPSK/16-QAM WDM channels using nonlinear wave mixing

Fatemeh Alishahi*, Amirhossein Mohajerin-Ariaei, Ahmad Fallahpour, Yinwen Cao, Ahmed Almaiman, Peicheng Liao, Changjing Bao, Bishara Shamee, Kaiheng Zou, Huibin Zhou, Ari N. Willner, Joseph D. Touch, Moshe Tur, Carsten Langrock, Martin M. Fejer, Alan E. Willner

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

Abstract

Optical mitigation of interchannel interference (ICI) for multiple spectrally overlapped data channels is experimentally demonstrated without multichannel detection and channel spacing estimation. The ICI mitigation takes place in three stages of periodically poled lithium niobate (PPLN) waveguides. In the first PPLN stage, the conjugate copies of channels are generated. In the second stage, the overlapped signals are coherently multiplexed with different complex taps. In the third stage, the concurrent nonlinear processes and the coherent multiplexing of the signals with their delayed copies compensate the ICI. The bit error rate and the constellation diagrams of wavelength division multiplexed (WDM) channels carrying quadrature phase-shift keying (QPSK) or 16 quadrature amplitude modulation (16-QAM) formats demonstrate the potential capability of the proposed method to reduce the ICI and its possible modulation format transparency. The effect of channel spacing on the performance of the method is also demonstrated. After optical ICI mitigation, a reduction of almost 4 dB is achieved for the value of optical signal-to-noise ratio at BER of 10 -3 for 20-GBd QPSK signals with a channel spacing of 17.5 GHz. The overlapped WDM system of 20-GBd 16-QAM signals with channel spacing of 17.5 GHz is also ICI mitigated and error vector magnitudes are reduced by almost 28%.

Original languageEnglish
Article number8598799
Pages (from-to)548-554
Number of pages7
JournalJournal of Lightwave Technology
Volume37
Issue number2
DOIs
StatePublished - 15 Jan 2019

Keywords

  • Crosstalk
  • difference frequency generation
  • interchannel interference
  • nonlinear wave mixing
  • periodically poled lithium niobate waveguides
  • quadrature amplitude modulation
  • quadrature phase shift keying
  • sum frequency generation
  • wavelength division multiplexing

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