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Updated: May 13, 2026

Automation of Mode Locking in a Nonlinear Polarization Rotation Fiber Laser through Output Polarization Measurements
Published on: February 28, 2016
Passive mode-locking of fiber ring laser at the 337th harmonic using gigahertz acoustic core resonances
M S Kang1, N Y Joly, P St J Russell
1Max Planck Institute for the Science of Light, University of Erlangen-Nuremberg, Guenther-Scharowsky-Str. 1, 91058 Erlangen, Germany. mskang@kaist.ac.kr
Abstract:
We report the experimental demonstration of a passively mode-locked Er-doped fiber ring laser operating at the 337th harmonic (1.80 GHz) of the cavity. The laser makes use of highly efficient Raman-like optoacoustic interactions between the guided light and gigahertz acoustic resonances trapped in the micron-sized solid glass core of a photonic crystal fiber. At sufficient pump power levels the laser output locks to a repetition rate corresponding to the acoustic frequency. A stable optical pulse train with a side-mode suppression ratio higher than 45 dB was obtained at low pump powers (~60 mW).
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