All-Fiber Widely Wavelength-Tunable Thulium-Doped Fiber
Ring Laser Incorporating a FabryPerot Filter¹

Y. Wei^{a, b}, K. Hu^b, B. Sun^b, and T. Wang^a, *

^a College of Communication Engineering and Hangzhou Dianzi University, Hangzhou 310000, China

^b Centre for Optical and Electromagnetic Research, State Key Laboratory for Modern Optical Instrumentation,
Zhejiang University, Hangzhou, 310058 China

e-mail: tianshuw@hdu.edu.cn

Received November 10, 2011; in final form, November 12, 2011; published online March 6, 2012

Abstract—We demonstrate 1940 to 2010 nm continuous CW wavelength-tuning in a thulium-doped fiber laser
(TDFL), using only fiber-format components. A fiber Fabry–Perot (FP) tunable filter is employed to achieve the
wavelength tunability of 70 nm. By imposing a 200 Hz triangle wave signal on the filter, rapid wavelength-
sweeping is demonstrated from 1952 to 1992 nm every 5 ms, corresponding to 8 nm/ms. This all-fiber wave-
length-tunable and swept laser may find applications such as gas monitoring in the wavelength region of 2 m.

DOI: 10.1134/S1054660X12040263

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