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Related Experiment Video

Updated: Nov 23, 2025

Shaping the Amplitude and Phase of Laser Beams by Using a Phase-only Spatial Light Modulator

Shaping the Amplitude and Phase of Laser Beams by Using a Phase-only Spatial Light Modulator

Published on: January 28, 2019

Distortion-corrected phase demodulation using phase-generated carrier with multitone mixing.

Yisbel Marin, Philippe Velha, Claudio J Oton

|December 31, 2020

Summary

We developed a new phase generated carrier (PGC) demodulation technique for homodyne interferometers. This method corrects distortion caused by modulation depth variations and intensity fluctuations without adding noise.

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Last Updated: Nov 23, 2025

Shaping the Amplitude and Phase of Laser Beams by Using a Phase-only Spatial Light Modulator

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Published on: January 28, 2019

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Generation and Coherent Control of Pulsed Quantum Frequency Combs

Generation and Coherent Control of Pulsed Quantum Frequency Combs

Published on: June 8, 2018

Area of Science:

Optical interferometry
Signal processing

Background:

Homodyne interferometers are sensitive to environmental and source fluctuations.
Standard phase generated carrier (PGC) demodulation can suffer from distortion due to modulation depth variations.

Purpose of the Study:

To present a novel PGC demodulation technique robust to modulation depth variations and source intensity fluctuations.
To provide real-time DC component of phase without prior data or ellipse fitting.

Main Methods:

Digitally mixing the interferometric waveform with a multitone synthetic function.
Utilizing a linear combination of harmonics of the modulating signal.
Implementing the technique with only two mixers.

Main Results:

Achieved negligible distortion even with large modulation depth variations.
Successfully provided real-time DC component of phase.
Validated the technique with simulated data and experimental wavelength metering data from an on-chip interferometer.
Demonstrated distortion correction without increasing noise compared to standard PGC.

Conclusions:

The novel PGC demodulation technique offers improved robustness and real-time capabilities for homodyne interferometry.
This method is suitable for applications like wavelength metering where stability is crucial.