Abstract

We report a widely tunable ring-cavity tellurite fiber Raman laser covering the $\mathrm{S}+\mathrm{C}+\mathrm{L}+\mathrm{U}$ band. A tunable range ($1495–1600\mathrm{nm}$, limited by the tunable optical bandpass filter) over $100\mathrm{nm}$ is obtained by using a single-mode tellurite fiber with high Raman gain coefficients $\left(55{\mathrm{W}}^{-1}{\mathrm{km}}^{-1}\right)$ and large Raman shift $(\sim 22.3\mathrm{THz})$ as the gain medium. Furthermore, the free-running $1665\mathrm{nm}$ 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 $\mathrm{S}+\mathrm{C}+\mathrm{L}+\mathrm{U}$ band. A high optical signal-to-noise ratio of over $60\mathrm{dB}$ for almost all of the tunable range is also demonstrated.

© 2008 Optical Society of America

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