An in-line in-fibre ring cavity sensor for localized multi-parameter sensing

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Abstract
An in-line in-fibre ring cavity is fabricated by writing two blazed gratings in the one fibre to form a Fabry-Perot cavity. Interference is set up between an injected guided mode and a ring mode formed by light scattered by the gratings from the core mode to a reverse propagating ghost mode and then back into the original core mode again. The ability to measure the external refractive index and the variability of this response with a different cavity length is experimentally demonstrated. Within a given region of interest, a sensitivity to the surrounding refractive index as good as 9.5 x 10(-5) is established.
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Author(s)
Childs, P
Wong, A
Leung, Ian
Peng, Gang-Ding
Liao, Y
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Publication Year
2008
Resource Type
Journal Article
Degree Type
UNSW Faculty