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Appl. Sci. 2018, 8(7), 1135;

Tunable and Switchable Erbium-Doped Fiber Laser Using a Multimode-Fiber Based Filter

Department of Physics and Computer Science, Wilfrid Laurier University, Waterloo, ON N2L 3C5, Canada
Department of Physics and Astronomy, University of Waterloo, Guelph-Waterloo Physics Institute, Waterloo, ON N2L 3G1, Canada
Author to whom correspondence should be addressed.
Received: 16 June 2018 / Revised: 9 July 2018 / Accepted: 11 July 2018 / Published: 13 July 2018
(This article belongs to the Special Issue Erbium-doped Fiber Lasers)
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We demonstrated a compact tunable and switchable single/dual-wavelength erbium-doped fiber laser. The fiber laser can be tuned and switched from single-wavelength to dual-wavelength oscillation by using our recently proposed tunable comb filter. The comb filter consists of a section of multimode fiber (MMF) coiled into a polarization controller and two sections of single mode fibers (SMFs) to form a SMF/MMF/SMF structure, serving as a simple tunable all-fiber Mach-Zehnder interferometer. Due to the insertion of the MMF-based polarization controller (PC), an additional phase shift is introduced from the difference of the birefringence intensity in different dominant modes, which can be used to tune the fiber laser. In the experiment, by properly adjusting the PC, a tuning range of 9.3 nm can be achieved for the single-wavelength operation. Moreover, dual-wavelength operation with different free-spectral-ranges can be obtained. The tunable and switchable fiber lasers are of great importance for their applications in optical testing, optical fiber sensing, and signal processing. View Full-Text
Keywords: fiber laser; laser tuning; switchable; tunable optical filter fiber laser; laser tuning; switchable; tunable optical filter

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Khattak, A.; Tatel, G.; Wei, L. Tunable and Switchable Erbium-Doped Fiber Laser Using a Multimode-Fiber Based Filter. Appl. Sci. 2018, 8, 1135.

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