Abstract
An all-optical power sensor based on silicon-germanium (SiGe) core fiber Fabry-Perot (F-P) cavity is proposed. The F-P sensor was formed by fusion splicing SiGe core fiber with conventional single-mode fiber (SMF). The 980 nm laser can be absorbed efficiently by the silicon-germanium material, resulting in the temperature increase inside the cavity, which induces the drifts of the reflection spectrum. The injected power has a very good linear relationship with the drifts experimentally, and the power sensitivity is up to 1.7 nm/mW, which may have great potential for all-fiber power detector.
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