Abstract

We report a widely tunable ring-cavity tellurite fiber Raman laser covering the S+C+L+U band. A tunable range (14951600nm, limited by the tunable optical bandpass filter) over 100nm is obtained by using a single-mode tellurite fiber with high Raman gain coefficients (55W1km1) and large Raman shift (22.3THz) as the gain medium. Furthermore, the free-running 1665nm 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 60dB for almost all of the tunable range is also demonstrated.

© 2008 Optical Society of America

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