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Title: Investigation of humidity and temperature response of a silica gel coated microfiber coupler
Authors: Sun, L
Semenova, Y
Wu, Q
Liu, D
Yuan, J
Sang, X
Yan, B
Wang, K
Yu, C
Farrell, G
Keywords: Humidity response
Microfiber coupler
Silica gel
Temperature response
Issue Date: 2016
Publisher: Institute of Electrical and Electronics Engineers
Source: IEEE photonics journal, 2016, v. 8, no. 6, 6805407 How to cite?
Journal: IEEE photonics journal 
Abstract: 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 m 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 m 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.
EISSN: 1943-0655
DOI: 10.1109/JPHOT.2016.2619479
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