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

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• 作者：Lo ; Yu-Lung ; Tsai ; Ming-Hong ; Tsao ; Chih-Chiang
• 关键词：Cross-talk ; Fabry&ndash ; Perot sensors ; PMDI ; Spectrum analysis
• 刊名：Optics and Laser Technology
• 出版年：1998
• 出版时间：September 10, 1998
• 年：1998
• 卷：30
• 期：6-7
• 页码：395-401
• 全文大小：229 K

文摘

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 and 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.