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Strain, Temperature and Humidity Sensing with Multimode Interference in POF

Oliveira, R. ; Marques, T. H. R. ; Bilro, L. ; Cordeiro, C. M. B. ; Nogueira, R.N.

Strain, Temperature and Humidity Sensing with Multimode Interference in POF, Proc Internacional Conf. on Plastic Optical Fibers - POF, Birmingam, United Kingdom, Vol. OP35, pp. 1 - 5, September, 2016.

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Abstract
In this work, we have used a multimode polymer optical fiber (MM-POF) sandwiched between two silica single-mode fibers, to create a multimode interferometer (MMI) based on a POF. A beam propagation method was used to calculate the MM-POF length needed to produce a peak centered in the near-infrared region. Therefore, a peak centered in the 1550 nm region was created by using the 18th self-image. The sensor was char-acterized to three parameters and the sensitivities obtained were -2.8 pm/με, 212 pm/ºC and 67 pm/%RH, for the strain, temperature and humidity tests, respectively.