title: Tunable gratings in a hollow-core photonic bandgap fiber based on acousto-optic interaction.
abstract: We demonstrate a coherent intermodal coupling in a hollow-core photonic bandgap fibers (PBGF) using an acoustic grating. A theoretical study on the properties of acoustic and optical wave propagating the PBGF is performed indicating that the applied frequency higher than 10 MHz is required to obtain the acousto-optic interaction at the wavelength around 1550 nm. Wavelength-tunable coupling from fundamental mode to higher-order core modes is achieved with more than 90% coupling efficiency at the applied frequency of 11.54 MHz. The low dispersive properties and the mode filed distributions of the higher-order guided modes of the air-core PBGF in the experiment show reasonable agreement with the simulation results.
authors.affiliation: Division of Energy Systems Research, Ajou University, Yongtong-gu, Suwon, Korea. diyeom@ajou.ac.kr
authors.forename: Dong-Il
authors.initials: DI
authors.lastname: Yeom
authors.forename: Hyun Chul
authors.initials: HC
authors.lastname: Park
authors.forename: In Kag
authors.initials: IK
authors.lastname: Hwang
authors.forename: Byoung Yoon
authors.initials: BY
authors.lastname: Kim
mesh_terms: D000162:Acoustics / Q000295:instrumentation*; D017076:Computer-Aided Design; D004867:Equipment Design; D019544:Equipment Failure Analysis; D055100:Optical Fibers; D017785:Photons; D012031:Refractometry / Q000295:instrumentation*; D015203:Reproducibility of Results; D012680:Sensitivity and Specificity; D014159:Transducers