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Title: Hollow-core microstructured optical fiber gas sensors
Authors: Yang, F 
Jin, W 
Lin, YC 
Wang, C 
Lut, H 
Tan, YZ 
Issue Date: 15-Aug-2017
Source: Journal of lightwave technology, 15 Aug. 2017, v. 35, no. 16, p. 3413-3424
Abstract: Recent progress in gas detection with hollow-core microstructured optical fibers (HC-MOFs) and direct absorption/photothermal interferometry spectroscopy are reported. For direct-absorption sensors, the issue of mode interference noise is addressed and techniques to minimize such a noise are experimentally demonstrated. Large-scale drilling of hundreds of low-loss micro-channels along a single HC-MOF is performed, and reduction of diffusion-limited response time from hours to similar to 40 s is demonstrated with a 2.3-m-long HC-MOF. For photothermal inteferometry sensors, novel detection configurations based on respectively a Sagnac interferometer and an in-fiber modal interferometer are experimentally demonstrated. The Sagnac configuration avoids the need for complex servo-control for interferometer stabilization while the in-fiber configuration simplifies the detection, reducing the size and cost of the sensor system. Sub ppm gas detection can be achieved easily with photothermal interferometry HC-MOF sensors but is difficult to achieve for direct-absorption sensors with the current commercial HC-MOFs.
Keywords: Gas detectors
Optical fiber applications
Optical fiber measurements
Optical fiber sensors
Optical spectroscopy
Photothermal interferometry
Publisher: Institute of Electrical and Electronics Engineers
Journal: Journal of lightwave technology 
ISSN: 0733-8724
EISSN: 1558-2213
DOI: 10.1109/JLT.2016.2628092
Rights: ©2016 IEEE. Personal use of this material is permitted. Permission from IEEE must be obtained for all other uses, in any current or future media, including reprinting/republishing this material for advertising or promotional purposes, creating new collective works, for resale or redistribution to servers or lists, or reuse of any copyrighted component of this work in other works.
The following publication F. Yang, W. Jin, Y. Lin, C. Wang, H. Lut and Y. Tan, "Hollow-Core Microstructured Optical Fiber Gas Sensors," in Journal of Lightwave Technology, vol. 35, no. 16, pp. 3413-3424, 15 Aug.15, 2017 is available at
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