title: Integrated optical circulator by stimulated Brillouin scattering induced non-reciprocal phase shift.
abstract: We propose a new approach to realize all-optical circulator based on stimulated Brillouin scattering in an integrated microresonator. Stimulated Brillouin scattering is a basic interaction between photon and traveling acoustic wave resulted from electrostriction and photoelastic effects. Due to the phase-matching requirement, the circulating acoustic wave can only couple to probe light which propagating along or opposite to the pump laser direction, thus exhibits a non-reciprocal phase shift. Combined with Mach-Zehnder interferometer, the optical circulator can be realized. Though the bandwidth is relatively small because of the narrow-band nature of microresonator, this magnetic-free all-optical integrated circulator may be applied for future on-chip photonic information processing.
authors.forename: Wei
authors.initials: W
authors.lastname: Fu
authors.forename: Fang-Jie
authors.initials: FJ
authors.lastname: Shu
authors.forename: Yan-Lei
authors.initials: YL
authors.lastname: Zhang
authors.forename: Chun-Hua
authors.initials: CH
authors.lastname: Dong
authors.forename: Chang-Ling
authors.initials: CL
authors.lastname: Zou
authors.forename: Guang-Can
authors.initials: GC
authors.lastname: Guo