Z.-C. Luo, J.-R. Liu, H.-Y. Wang, A.-P. Luo*, and W.-C. Xu**
Key laboratory of Photonic Information Technology of Guangdong Higher Education Institutes,
School of Information and Optoelectronic Science and Engineering, South China Normal University,
Guangzhou, Guangdong 510006, China
*e-mail: luoaiping@scnu.edu.cn
**e-mail: xuwch@scnu.edu.cn
Received March 24, 2011; in final form, June 20, 2011; published online October 24, 2011
Abstract—A wide-band tunable passively Q-switched all-fiber ring laser based on nonlinear polarization rota-
tion (NPR) technique is demonstrated. The NPR-induced intensity-dependent loss effect acts as an artificial sat-
urable absorber, which was used to achieve the Q-switched operation with a low pump threshold of about 25
mW. Taking advantage of the intracavity birefringence-induced spectral filtering effect, the central wavelength
of Q-switched pulse can be continuously tuned from 1543.4 to 1592.4 nm by simply rotating the PCs.
10.1134/S1054660X11230125
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