We present a novel phase generated carrier (PGC) demodulation technique for homodyne interferometers which is robust to modulation depth variations and source intensity fluctuations. By digitally mixing the waveform with a multitone synthetic function (a linear combination of harmonics of the modulating signal), distortion can become negligible even in presence of large variations of the modulation depth. The technique only requires two mixers and can also provide the DC component of the phase in real time, without needing any previously recorded data or ellipse-fitting algorithms. We validate the technique with simulated waveforms and with experimental data from a wavelength metering experiment using an integrated unbalanced interferometer on-chip, showing that the technique corrects distortion without increasing the noise with respect to the standard PGC technique.

Distortion-corrected phase demodulation using phase-generated carrier with multitone mixing / Marin, Y.; Velha, P.; Oton Nieto, C. J.. - In: OPTICS EXPRESS. - ISSN 1094-4087. - 28:24(2020), pp. 36849-36861. [10.1364/OE.405598]

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

Velha P.
Secondo
;
2020-01-01

Abstract

We present a novel phase generated carrier (PGC) demodulation technique for homodyne interferometers which is robust to modulation depth variations and source intensity fluctuations. By digitally mixing the waveform with a multitone synthetic function (a linear combination of harmonics of the modulating signal), distortion can become negligible even in presence of large variations of the modulation depth. The technique only requires two mixers and can also provide the DC component of the phase in real time, without needing any previously recorded data or ellipse-fitting algorithms. We validate the technique with simulated waveforms and with experimental data from a wavelength metering experiment using an integrated unbalanced interferometer on-chip, showing that the technique corrects distortion without increasing the noise with respect to the standard PGC technique.
2020
24
Marin, Y.; Velha, P.; Oton Nieto, C. J.
Distortion-corrected phase demodulation using phase-generated carrier with multitone mixing / Marin, Y.; Velha, P.; Oton Nieto, C. J.. - In: OPTICS EXPRESS. - ISSN 1094-4087. - 28:24(2020), pp. 36849-36861. [10.1364/OE.405598]
File in questo prodotto:
File Dimensione Formato  
OE20 Distortion correction multitone mixing.pdf

accesso aperto

Tipologia: Versione editoriale (Publisher’s layout)
Licenza: Tutti i diritti riservati (All rights reserved)
Dimensione 3.09 MB
Formato Adobe PDF
3.09 MB Adobe PDF Visualizza/Apri

I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione

Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11572/364822
Citazioni
  • ???jsp.display-item.citation.pmc??? ND
  • Scopus 11
  • ???jsp.display-item.citation.isi??? 9
social impact