L. L. Shi*, T. Zhu, F. Y. Chen, M. Deng, and W. Huang
Key Lab of Optoelectronic Technology and System (Education Ministry of China), Chongqing University,
Chongqing 400044, China
*e-mail: zhutao@cqu.edu.cn
Received August 15, 2011; in final form, September 26, 2011; published online February 6, 2012
Abstract—A filter based on a Mach–Zehnder interferometer (MZI) formed by cascading a pair of long-period
fiber gratings (LPFGs) written by CO2 laser in a twisted single-mode fiber is proposed. The transmission spec-
trum of the filter is tuned by modifying the bending curvature of the MZI, and thus wavelength tuning is
achieved. And a tunable erbium-doped fiber (EDF) ring laser employing the filter as a wavelength-selection
component is experimentally demonstrated. The laser can be tuned continuously from 1573.05 to 1595.75 nm
with a side-mode suppression ration of ~50 dB over the total tuning range.
DOI: 10.1134/S1054660X1203019X
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