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A novel single‐mode Er‐doped fiber‐ring laser: Experiment
Author(s) -
Shi ChaoXiang
Publication year - 1996
Publication title -
microwave and optical technology letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.304
H-Index - 76
eISSN - 1098-2760
pISSN - 0895-2477
DOI - 10.1002/(sici)1098-2760(199603)11:4<187::aid-mop6>3.0.co;2-g
Subject(s) - fiber laser , polarization maintaining optical fiber , optics , materials science , single mode optical fiber , dispersion shifted fiber , ring laser , mode volume , polarization (electrochemistry) , laser , graded index fiber , optical fiber , optoelectronics , fiber optic sensor , physics , chemistry
A single‐mode Er‐doped fiber‐ring laser having no polarization‐mode instability is proposed, and its single‐mode operation is experimentally investigated. The Er‐doped fiber is twisted to form a fiber‐ring laser. The right‐ and the left‐hand‐rotated circular‐polarization waves presented in the twisted fiber are exchanged by a fiber‐type ½ element placed in the fiber ring. This configuration can fix the separation between the two polarization‐mode resonances (i.e, the two ESOP resonances) and suppress the polarization‐mode instability. Tunable optical filters are cascaded and placed within the resonator in order to obtain single‐mode operation. The frequency spectrum of the single‐mode fiber laser is measured using the delayed self‐heterodyne detection. The tunable range of the laser frequency is about 39 nm. © 1996 John Wiley & Sons, Inc.