Optically differential phase detection using cross-talk mode of series Fabry-Perot sensors in PMDI

Yu-Lung Lo, Chun Han Wang

Research output: Contribution to journalArticle

Abstract

The signals between cascaded Fabry-Perot sensors have serious cross-talk problems due to complex phase interactions between sensors. However, cross-talk mode in cascaded Fabry-Perot sensors can be employed for demodulating optically differential-phase in a path-matching differential interferometry (PMDI). This paper presents a novel design in two series Fabry-Perot sensors for a differential-phase measurement analyzed by an optical spectrum analysis. The spectrum transfer function in a light source and Fabry-Perot cavities are simulated by a Gaussian distribution spectrum and a low-finesse reflectivity, respectively. It shows that two series Fabry-Perot sensors with the differential-phase measurement can be designed accurately. Experimental data shows that the novel design in measuring a differential-phase between two series Fabry-Perot sensors is achieved. This design in two series Fabry-Perot sensors for a differential-phase measurement can be applied to unbalanced system detection or noise compensations.

Original languageEnglish
Pages (from-to)552-556
Number of pages5
JournalProceedings of SPIE - The International Society for Optical Engineering
Volume3897
Publication statusPublished - 1999

Fingerprint

differential interferometry
Fabry-Perot
Crosstalk
Interferometry
Sensor
Path
Series
Phase Measurement
sensors
Sensors
Phase measurement
Fabry-Perot Cavity
Spectrum Analysis
Gaussian distribution
Reflectivity
normal density functions
transfer functions
Spectrum analysis
Transfer Function
spectrum analysis

All Science Journal Classification (ASJC) codes

  • Electrical and Electronic Engineering
  • Condensed Matter Physics

Cite this

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abstract = "The signals between cascaded Fabry-Perot sensors have serious cross-talk problems due to complex phase interactions between sensors. However, cross-talk mode in cascaded Fabry-Perot sensors can be employed for demodulating optically differential-phase in a path-matching differential interferometry (PMDI). This paper presents a novel design in two series Fabry-Perot sensors for a differential-phase measurement analyzed by an optical spectrum analysis. The spectrum transfer function in a light source and Fabry-Perot cavities are simulated by a Gaussian distribution spectrum and a low-finesse reflectivity, respectively. It shows that two series Fabry-Perot sensors with the differential-phase measurement can be designed accurately. Experimental data shows that the novel design in measuring a differential-phase between two series Fabry-Perot sensors is achieved. This design in two series Fabry-Perot sensors for a differential-phase measurement can be applied to unbalanced system detection or noise compensations.",
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