Towards high sensitivity gas detection with hollow-core photonic bandgap fibers

Fan Yang, Wei Jin, Yingchun Cao, Hoi Lut Ho, Yiping Wang
2014 Optics Express  
This paper investigates the effect of modal interference on the performance of hollow-core photonic bandgap fiber (HC-PBF) gas sensors. By optimizing mode launch, using proper length of sensing HC-PBF, and applying proper wavelength modulation in combination with lock-in detection, as well as appropriate digital signal processing, an estimated lower detection limit of less than 1 part-per-million by volume (ppmv) acetylene is achieved.
doi:10.1364/oe.22.024894 pmid:25322061 fatcat:c7biebjwxndnznzzkqaffzscjy