Journal
JOURNAL OF LIGHTWAVE TECHNOLOGY
Volume 35, Issue 16, Pages 3413-3424Publisher
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/JLT.2016.2628092
Keywords
Gas detectors; optical fiber applications; optical fiber measurements; optical fiber sensors; optical spectroscopy; photothermal interferometry
Funding
- Hong Kong SAR government through a GRF [PolyU 152064/14E]
- National Natured Science Foundation of China [61290313, 61535004]
- Hong Kong Polytechnic University [4-BCBE]
- Hong Kong government through ITF [ITS/348/14]
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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.
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