title: Experimental investigation on Brillouin scattering property in highly nonlinear photonic crystal fiber with hybrid core.
abstract: Brillouin scattering property in a highly nonlinear photonic crystal fiber (HNL-PCF) with hybrid-core structure is experimentally investigated. The HNL-PCF comprises a highly Ge-doped core surrounded by a triangularly-arranged F-doped buffer. It is experimentally shown that there exist five Brillouin resonance peaks with ~300 MHz frequency spacing in the Brillouin gain spectrum, which can be classified into two groups physcially attributed to two spatially separated layers of Ge-doped and F-doped regions. These peaks have similar linear dispersion characteristics and their effective acoustic velocities increase monotonically by the order of the peaks. The acousto-optic overlapping efficiency in the fiber is measured to be ~50%, which indicates that the stimulated Brillouin scattering threshold in the HNL-PCF is twofold enhanced. The temperature and strain dependences of the first resonance peak are also investigated, showing the similar behaviors as those in all-silica optical fibers.
authors.affiliation: Department of Electrical Engineering and Information Systems, The University of Tokyo, Tokyo, Japan. wzou@sjtu.edu.cn
authors.forename: Weiwen
authors.initials: W
authors.lastname: Zou
authors.forename: Zuyuan
authors.initials: Z
authors.lastname: He
authors.forename: Kazuo
authors.initials: K
authors.lastname: Hotate