title: Detecting mode hopping in single-longitudinal-mode fiber ring lasers based on an unbalanced fiber Michelson interferometer.
abstract: A method of detecting mode hopping for single-longitudinal-mode (SLM) fiber ring lasers has been proposed and experimentally demonstrated. The method that is based on an unbalanced Michelson interferometer (MI) utilizing phase generated carrier modulation instantly transforms mode-hopping dynamics into steep phase changes of the interferometer. Multiform mode hops in an SLM erbium-doped fiber ring laser with an 18.6 MHz mode spacing have been detected exactly in real-time domain and discussed in detail. Numerical results show that the MI-based method has a high testing sensitivity for identifying mode hopping, which will play a significant role in evaluating the output stability of SLM fiber lasers.
authors.affiliation: College of Optoelectronic Science and Technology, National University of Defense Technology, Changsha, Hunan, China.
authors.forename: Mingxiang
authors.initials: M
authors.lastname: Ma
authors.forename: Zhengliang
authors.initials: Z
authors.lastname: Hu
authors.forename: Pan
authors.initials: P
authors.lastname: Xu
authors.forename: Wei
authors.initials: W
authors.lastname: Wang
authors.forename: Yongming
authors.initials: Y
authors.lastname: Hu