title: Depolarized guided acoustic wave Brillouin scattering in hollow-core photonic crystal fibers.
abstract: By performing quantum-noise-limited optical heterodyne detection, we observe polarization noise in light after propagation through a hollow-core photonic crystal fiber (PCF). We compare the noise spectrum to the one of a standard fiber and find an increase of noise even though the light is mainly transmitted in air in a hollow-core PCF. Combined with our simulation of the acoustic vibrational modes in the hollow-core PCF, we are offering an explanation for the polarization noise with a variation of guided acoustic wave Brillouin scattering (GAWBS). Here, instead of modulating the strain in the fiber core as in a solid core fiber, the acoustic vibrations in hollow-core PCF influence the effective refractive index by modulating the geometry of the photonic crystal structure. This induces polarization noise in the light guided by the photonic crystal structure.
authors.forename: Wenjia Elser née
authors.initials: WE
authors.lastname: Zhong
authors.forename: Birgit
authors.initials: B
authors.lastname: Stiller
authors.forename: Dominique
authors.initials: D
authors.lastname: Elser
authors.forename: Bettina
authors.initials: B
authors.lastname: Heim
authors.forename: Christoph
authors.initials: C
authors.lastname: Marquardt
authors.forename: Gerd
authors.initials: G
authors.lastname: Leuchs