title: Characterization of distributed modal birefringence in a few-mode fiber based on Brillouin dynamic grating.
abstract: We propose and demonstrate generation of Brillouin dynamic grating (BDG) in a few-mode fiber (FMF) with a Gaussian pulse pump and a counterpropagating continuous wave pump in LP01 mode. Brillouin optical time-domain analysis (BOTDA) is achieved by launching a third Gaussian pulse probe in LP11 mode. With coherent detection and time-domain analysis on the backreflected probe signal, the modal birefringence of the FMF is characterized via the distributed BDG with high spatial resolution and high accuracy.
authors.forename: An
authors.initials: A
authors.lastname: Li
authors.forename: Qian
authors.initials: Q
authors.lastname: Hu
authors.forename: Xi
authors.initials: X
authors.lastname: Chen
authors.forename: Byoung Yoon
authors.initials: BY
authors.lastname: Kim
authors.forename: William
authors.initials: W
authors.lastname: Shieh