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Fibers 2013, 1(3), 82-92; doi:10.3390/fib1030082
Article

Heavily Tm3+-Doped Silicate Fiber for High-Gain Fiber Amplifiers

1,* , 1
,
1
,
1
,
1
 and
2
1 Department of Electro-optical Engineering, National Taipei University of Technology, 1, Sec. 3, Chung-Hsiao E. Rd, 10608, Taiwan 2 AdValue Photonics Inc., 3708 E. Columbia Street, Suite 100, Tucson, AZ 85714, USA
* Author to whom correspondence should be addressed.
Received: 4 November 2013 / Revised: 26 November 2013 / Accepted: 27 November 2013 / Published: 3 December 2013
(This article belongs to the Special Issue Advances on Optical Fibers)
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Abstract

We report on investigation the potential of a 7 wt% (8.35 × 1020 Tm3+/cm3) doped silicate fibers for high-gain fiber amplifiers. Such a high ion concentration significantly reduces the required fiber length of high-power 2 μm fiber laser systems and allows the high-repetition rate operation in 2 μm mode-locked fiber lasers. To evaluate the feasibility of extracting high gain-per-unit-length from this gain medium, we measure several key material properties of the silicate fiber, including the absorption/emission cross-sections, upper-state lifetime, fiber background loss, and photodarkening resistance. We show through numerical simulations that a signal gain-per-unit-length of 3.78 dB/cm at 1950 nm can be achieved in a watt-level core-pumped Tm3+-doped silicate fiber amplifier. In addition, an 18-dB 2013-nm amplifier is demonstrated in a 50-cm 7 wt% Tm3+-doped double-clad silicate fiber. Finally, we experimentally confirm that the reported silicate host exhibits no observable photodarkening.
Keywords: Thulium; silicate fiber; fiber laser; fiber amplifiers Thulium; silicate fiber; fiber laser; fiber amplifiers
This is an open access article distributed under the Creative Commons Attribution License (CC BY 3.0).

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Lee, Y.-W.; Chien, H.-W.; Cho, C.-H.; Chen, J.-Z.; Chang, J.-S.; Jiang, S. Heavily Tm3+-Doped Silicate Fiber for High-Gain Fiber Amplifiers. Fibers 2013, 1, 82-92.

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