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PDM-iRZ-QPSK vs. PS-QPSK at 100 Gbit/s over dispersion-managed links.

P Serena1, N Rossi, A Bononi

  • 1Dept. of Information Engineering, Università degli Studi di Parma, 43124 Parma, Italy. paolo.serena@unipr.it

Optics Express
|March 29, 2012
PubMed
Summary

Polarization-multiplexed (PDM) in-return-to-zero Quadrature Phase Shift Keying (QPSK) and polarization-switched (PS) QPSK offer similar transmission reach in optical fiber links. Accurate simulations require accounting for amplified spontaneous emission (ASE) noise.

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Area of Science:

  • Optical communications engineering
  • Photonics and optical physics
  • Digital signal processing for optical systems

Background:

  • Advanced modulation formats like PDM-iRZ-QPSK and PS-QPSK are crucial for high-capacity optical networks.
  • Understanding nonlinear effects in optical fiber is essential for maximizing transmission performance.
  • Accurate simulation methods are vital for predicting and optimizing optical link behavior.

Purpose of the Study:

  • To compare the transmission performance of PDM-iRZ-QPSK and PS-QPSK in different fiber link configurations.
  • To analyze the impact of individual nonlinear effects (SPM, XPM, XPolM) on signal integrity.
  • To evaluate the accuracy of simulation techniques, specifically comparing noise loading with noisy in-line amplifiers.

Main Methods:

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  • Numerical simulations of 100 Gbit/s PDM-iRZ-QPSK and PS-QPSK systems.
  • Analysis of homogeneous and hybrid QPSK/OOK dispersion-managed links.
  • Individual investigation of nonlinear effects: self-phase modulation (SPM), cross-phase modulation (XPM), and cross-polarization modulation (XPolM).
  • Comparison of noise loading simulation method against realistic noisy in-line amplifiers.

    • Main Results:

    • Both PDM-iRZ-QPSK and PS-QPSK exhibit comparable transmission reach in both homogeneous and hybrid link setups.
    • Nonlinear effects, including SPM, XPM, and XPolM, significantly influence overall transmission performance.
    • Simulations incorporating distributed amplified spontaneous emission (ASE) are necessary for accurate performance prediction.

    Conclusions:

    • PDM-iRZ-QPSK and PS-QPSK are viable high-speed transmission formats with similar reach capabilities.
    • A thorough understanding and accurate modeling of nonlinear impairments are critical for optical communication system design.
    • The inclusion of distributed ASE in simulations is mandatory for realistic performance evaluation of optical links.