Journal
OPTICS LETTERS
Volume 33, Issue 17, Pages 2014-2016Publisher
OPTICAL SOC AMER
DOI: 10.1364/OL.33.002014
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We report a widely tunable ring-cavity tellurite fiber Raman laser covering the S+C+L+U band. Atunable range (1495-1600 nm, limited by the tunable optical bandpass filter) over 100 nm is obtained by using a single-mode tellurite fiber with high Raman gain coefficients (55 W-1 km(-1)) and large Raman shift (similar to 22.3 THz) as the gain medium. Furthermore, the free-running 1665 nm Raman fiber laser is achieved from the ring cavity by removing the tunable optical bandpass filter, which shows that such a tellurite fiber has potential for constructing a widely tunable fiber Raman laSEr covering the S+C+L+U band. A high optical signal-to-noise ratio of over 60 dB for almost all of the tunable range is also demonstrated. (c) 2008 Optical Society of America.
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