title: Towards high sensitivity gas detection with hollow-core photonic bandgap fibers.
abstract: 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.
authors.forename: Fan
authors.initials: F
authors.lastname: Yang
authors.forename: Wei
authors.initials: W
authors.lastname: Jin
authors.forename: Yingchun
authors.initials: Y
authors.lastname: Cao
authors.forename: Hoi Lut
authors.initials: HL
authors.lastname: Ho
authors.forename: Yiping
authors.initials: Y
authors.lastname: Wang