title: Fast response in-line gas sensor using C-type fiber and Ge-doped ring defect photonic crystal fiber.
abstract: An in-line chemical gas sensor was proposed and experimentally demonstrated using a new C-type fiber and a Ge-doped ring defect photonic crystal fiber (PCF). The C-type fiber segment served as a compact gas inlet/outlet directly spliced to PCF, which overcame previous limitations in packaging and dynamic responses. C-type fiber was prepared by optimizing drawing process for a silica tube with an open slot. Splicing conditions for SMF/C-type fiber and PCF/C-type fiber were experimentally established to provide an all-fiber sensor unit. To enhance the sensitivity and light coupling efficiency we used a special PCF with Ge-doped ring defect to further enhance the sensitivity and gas flow rate. Sensing capability of the proposed sensor was investigated experimentally by detecting acetylene absorption lines.
authors.affiliation: Photonic Device Physics Laboratory, Institute of Physics and Applied Physics, Yonsei University, Seoul 120–749, South Korea.
authors.forename: Sahar Hosseinzadeh
authors.initials: SH
authors.lastname: Kassani
authors.forename: Jiyoung
authors.initials: J
authors.lastname: Park
authors.forename: Yongmin
authors.initials: Y
authors.lastname: Jung
authors.forename: Jens
authors.initials: J
authors.lastname: Kobelke
authors.forename: Kyunghwan
authors.initials: K
authors.lastname: Oh
mesh_terms: D000114:Acetylene / Q000032:analysis*; D003460:Crystallization; D004867:Equipment Design; D019544:Equipment Failure Analysis; D005336:Fiber Optic Technology / Q000295:instrumentation*; D005740:Gases / Q000032:analysis*; D005857:Germanium / Q000737:chemistry* / Q000528:radiation effects; D012031:Refractometry / Q000295:instrumentation*; D014159:Transducers
chemical_list: D005740:Gases; D005857:Germanium; D000114:Acetylene