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Advancing Test in Coherent Transmission Systems

What does a Coherent Lightwave Signal Analyzer do?

  • Enables total calibration to make hardware “golden”
    • Analog front end path gains, phase angles
    • Frequency response
    • Path delays (skew)
  • Removes laser frequency offset
  • Removes laser phase fluctuations
  • Presents resulting modulation field
    • Constellation
    • Eye Diagram
    • Q plot
    • EVM
  • Can also model receiver function and even impairments
    • Remove CD, ISI, etc.; measure BER
    • Emulate a delay-line interferometer for differential signaling

Author: Daniel van der Weide