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Postnonlinearity compensation with data-driven phase modulators in phase-shift keying transmission.

Chris Xu, Xiang Liu

    Optics Letters
    |November 21, 2007
    PubMed
    Summary
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    A new postnonlinearity compensation method reduces phase jitter in phase-shift keying transmission. This technique improves ultralong-haul dense wavelength-division multiplexing by over 3dB.

    Area of Science:

    • Optical communications
    • Nonlinear optics

    Background:

    • Phase jitter in phase-shift keying (PSK) transmission limits system performance.
    • Self-phase modulation (SPM) and amplitude fluctuations induce nonlinear phase noise.

    Purpose of the Study:

    • To propose and evaluate a novel postnonlinearity compensation scheme.
    • To reduce phase jitter and improve signal quality in optical transmissions.

    Main Methods:

    • A phase modulator applies postcompensation to data pulses before the receiver.
    • Modulation magnitude is proportional to detected pulse intensity; sign opposes nonlinear phase shift.
    • Numerical simulations are used to assess system performance.

    Main Results:

    • The proposed method partially compensates for nonlinear phase noise.

    Related Experiment Videos

  • A differential phase-shift keying (DPSK) dispersion-managed soliton system at 10 Gbits/s shows significant improvement.
  • Over 3dB of improvement is achieved in ultralong-haul dense wavelength-division multiplexing (DWDM) transmissions.

    • Conclusions:

    • Postnonlinearity compensation is an effective strategy for mitigating nonlinear impairments.
    • The proposed scheme offers a practical solution for enhancing the reach and capacity of optical networks.