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Published on: February 28, 2016
Detecting mode hopping in single-longitudinal-mode fiber ring lasers based on an unbalanced fiber Michelson
Mingxiang Ma1, Zhengliang Hu, Pan Xu
1College of Optoelectronic Science and Technology, National University of Defense Technology, Changsha, Hunan, China.
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.

