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Optical Engineering

Switchable multiwavelength thulium-doped fiber ring lasers
Author(s): Shui Zhao; Ping Lu; Deming Liu; Jiangshan Zhang
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Paper Abstract

Two kinds of thulium-doped fiber ring lasers based on a spatial mode beating filter and comb filtering effect are presented and experimentally demonstrated, which all show multiwavelength laser spectrum around 2 μm. In the implementation of the first type of experiment configuration by the use of a piece of multimode fiber (MMF) as a spatial mode beating filter, dual-,triple-, and quadruple-wavelengths appeared whose extinction noise ratio is 25 dB by adjusting the angle of polarization controller. Different wavelength spaces are obtained by inserting different lengths of MMF. The second type is achieved by inserting a Sagnac loop mirror, which was constructed by a 3-dB coupler and a piece of polarization maintaining fiber. Seven stable wavelengths with channel spacing of 0.65 nm and an extinction ratio of 35 dB was achieved. These systems are simple and easy to construct, which can be useful for 2 μm wavelength-division-multiplexed applications.

Paper Details

Date Published: 7 August 2013
PDF: 7 pages
Opt. Eng. 52(8) 086105 doi: 10.1117/1.OE.52.8.086105
Published in: Optical Engineering Volume 52, Issue 8
Show Author Affiliations
Shui Zhao, Huazhong Univ. of Science and Technology (China)
Ping Lu, Huazhong Univ. of Science and Technology (China)
Deming Liu, Huazhong Univ. of Science and Technology (China)
Jiangshan Zhang, Huazhong Univ. of Science and Technology (China)

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