Spectrum analysis in cross-talk of series Fabry-Perot sensors in path-matching differential interferometry

Yu Lung Lo, Ming Hong Tsai, Chih Chiang Tsao

Research output: Contribution to journalArticlepeer-review

6 Citations (Scopus)


The signals between cascaded Fabry-Perot sensors have serious cross-talk problems due to complex phase interactions between sensors. However, cross-talks in cascaded Fabry-Perot sensors for demodulation in a path-matching differential interferometry (PMDI) can be limited by corresponding path-matching read-out systems. This paper presents a method of using spectrum analysis to design the series Fabry-Perot sensors without cross-talk. The spectrum transfer function in a light source and Fabry-Perot cavities are simulated by a Gaussian distribution spectrum an a low-finesse reflectivity, respectively. It shows that two series Fabry-Perot sensors without cross-talk can be designed precisely and following the same procedure, even more series Fabry-Perot sensors without cross-talks in PMDI can be achieved. In-line fiber etalon (ILFE) as a Fabry-Perot cavity is used for multiplexing in the experiment. Experimental data shows that the cross-talk between two series Fabry-Perot sensors is limited. This design in two series Fabry-Perot sensors in PMDI can be applied to a two-parameter optical fiber sensors.

Original languageEnglish
Pages (from-to)395-401
Number of pages7
JournalOptics and Laser Technology
Issue number6
Publication statusPublished - 1998

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Atomic and Molecular Physics, and Optics
  • Electrical and Electronic Engineering


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