Spectrum analysis in cross-talk of series Fabry–Perot sensors in path-matching differential interferometry
✍ Scribed by Yu-Lung Lo; Ming-Hong Tsai; Chih-Chiang Tsao
- Book ID
- 104160327
- Publisher
- Elsevier Science
- Year
- 1998
- Tongue
- English
- Weight
- 229 KB
- Volume
- 30
- Category
- Article
- ISSN
- 0030-3992
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✦ Synopsis
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 dierential 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 and a low-®nesse re¯ectivity, 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 ®ber 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 ®ber sensors.