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Summary
This summary is machine-generated.

This study introduces a novel method to correct nonlinearities in optical coherent detection using only demodulated data. This technique accurately compensates for system distortions without needing raw measurements, improving sensing applications.

Keywords:
coherent detectionhomodyne laser interferometrynonlinearity errors compensation

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Area of Science:

  • Optics and Photonics
  • Sensing Technology
  • Signal Processing

Background:

  • Optical coherent detection is crucial for sensitive applications but suffers from nonlinearities.
  • Existing nonlinear compensation methods often require raw data, limiting their use with processed outputs.
  • Demodulated data presents a challenge for accurate interpretation due to signal distortions.

Purpose of the Study:

  • To develop a nonlinearity compensation method applicable to demodulated data.
  • To address 1st and 2nd-order nonlinearities in homodyne and heterodyne systems.
  • To provide a practical solution for systems where raw data is inaccessible.

Main Methods:

  • Signal segmentation and baseline fitting to isolate distortions.
  • Averaging distortion shapes for accurate parameter retrieval.
  • Application to both homodyne and heterodyne optical coherent detection systems.

Main Results:

  • Simulations demonstrate effective reduction of nonlinearity-induced deviations without raw data.
  • Experimental validation on a silicon-photonics homodyne laser Doppler vibrometer.
  • Performance comparable to the established Heydemann correction method.

Conclusions:

  • The proposed method offers a viable solution for nonlinearity compensation using only demodulated data.
  • This approach enhances the accuracy and applicability of optical coherent detection systems.
  • It provides a practical alternative for real-world sensing scenarios with limited data access.