Investigation of Humidity and Temperature Response of a Silica Gel Coated Microfiber Coupler

Lei Sun, Yuliya Semenova, Qiang Wu, Dejun Liu, Jinhui Yuan, Xinzhu Sang, Binbin Yan, Kuiru Wang, Chongxiu Yu, Gerald Farrell

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35 Citations (Scopus)
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The humidity and temperature responses of a microfiber coupler (MFC) coated with silica gel are investigated. Two MFC structures with different waist diameters of 2.5 and 3.5 μm were fabricated by fusing and tapering two single-mode fibers using a microheater brushing technique. The influences of the coating thickness and tapered waist diameter on the sensing performance are analyzed. For the proposed sensor with a waist diameter of 2.5 μm and 8-layers thick coating, the change in the relative humidity (RH) results in an exponential blueshift with a maximum sensitivity of 1.6 nm/% RH in the range from 70 to 86% RH. In response to the temperature change, the sensor's transmission spectrum redshifts in a linear fashion with an average sensitivity of 0.55 nm/°C in the range from 20 to 40 °C. The study is important for the development of the proposed fiber structure as a humidity or temperature sensor.
Original languageEnglish
Pages (from-to)6805407
JournalIEEE Photonics Journal
Issue number6
Early online date20 Oct 2016
Publication statusPublished - Dec 2016


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