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http://dx.doi.org/10.3807/KJOP.2013.24.5.251

Humidity Sensor using Polyvinylpyrrolidone-Coated Mach-Zehnder Interferometer in Planar Lightwave Circuit  

Kim, Ju Ha (Nano-Photonics Research Center, Korea Photonics Technology Institute)
Kim, Myoung Jin (Nano-Photonics Research Center, Korea Photonics Technology Institute)
Jung, Eun Joo (Nano-Photonics Research Center, Korea Photonics Technology Institute)
Hwang, Sung Hwan (Nano-Photonics Research Center, Korea Photonics Technology Institute)
Lee, Woo Jin (Nano-Photonics Research Center, Korea Photonics Technology Institute)
Choi, Eun Seo (Department of Physics, College of Natural Science, Chosun University)
Rho, Byung Sup (Nano-Photonics Research Center, Korea Photonics Technology Institute)
Publication Information
Korean Journal of Optics and Photonics / v.24, no.5, 2013 , pp. 251-255 More about this Journal
Abstract
In this paper, the characteristics of a humidity sensor implemented by Mach Zehnder Interferometer (MZI) in a Planar Lightwave Circuit (PLC) have been designed and demonstrated. The humidity outside is detected with polyvinylpyrrolidone (PVP) coated on the etched arm of the MZI. The length of the etched arm is 10 mm and the PVP was coated by dip-coating into the etched region. As the refractive index of the PVP changes with the surrounding humidity, the PVP-coated humidity sensor presented changes in the interferogram depending on RH (Relative Humidity) around the PLC. The measured results show that the proposed humidity sensor works successfully in the range of 30% to 80% of RH.
Keywords
Polyvinylpyrrolidone(PVP); Planar Lightwave Circuit(PLC); Humidity sensor; Mach-Zehnder Interferometer(MZI);
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