Abstract
We demonstrate the proof of principle for a novel fibre optic sensor for the detection of high humidity. The device uses single-mode fibre at telecommunications wavelengths, making it particularly suitable for application in passive optical networks. The sensing mechanism relies on a humidity-induced refractive index change in an organic film coated onto the cladding of a bent fibre. The sensor was shown to respond at relative humidities >62% and >80% using gelatine and polyethylene oxide films respectively, by the onset of a strong interaction between the LP 01 mode and a whispering gallery mode.
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