S. X. Liu, C. H. Wang*, X. J. Zhu, C. X. Bu, and G. J. Zhang
Institute of Modern Optical Technologies, Key Laboratory of Advanced Optical Manufacturing of Jiangsu Province,
Soochow University, Suzhou 215006, China
*e-mail: chinhua.wang@suda.edu.cn
Received February 21, 2012; in final form, March 2, 2012; published online June 12, 2012
Abstract—An arbitrarily switchable multi-wavelength Yb-doped fiber laser (YDFL) based on a phase-shifted
long-period fiber grating (PS-LPFG) is proposed and demonstrated. The PS-LPFG, which was fabricated by a
CO2 laser under asymmetric exposure, acts as a spectral filter with anisotropic transmission spectrum at differ-
ent states of polarization. The capability of arbitrary wavelength switching can be attributed to the combination
of the polarization-dependent loss (PDL) of the PS-LPFG and the nonlinear polarization rotation (NPR) effect.
The method suggests a new possibility to achieve even more wavelengths output with an all-fiber format, arbi-
trarily switchable and tunable capability in the Yb-doped fiber laser system in a simple, stable and well con-
trolled manner.
DOI: 10.1134/S1054660X12070080
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