Abstract

We propose and demonstrate a tunable fiber laser based on an optical circulator (OC) and two tunable fiber Bragg gratings (TFBGs). The OC acts as a pump power router to improve the pumping efficiency, and a 4% increase in overall conversion efficiency has been observed. The combined tuning spectra range of two TFBGs could cover the entire C-band spectrum from 1530 to $1560\text{\hspace{0.17em} nm}$. Stable laser output power above $\text{10 dBm}$ is obtained using 1.9 m of erbium-doped fiber and TFBGs with 50% reflectivity. With power equalization by using variable optical attenuators, the power variation is less than $\text{0 .1 dB}$ in the whole C band with narrow linewidth of $\text{0 .05 nm}$. A signal-to-noise ratio of $\text{60 dB}$ and a continuous tuning resolution of $\text{0 .5 nm}$ have been achieved. The TFBG-based tunable fiber laser can be a promising light source for WDM transmission and fiber sensor applications.

© 2007 Optical Society of America

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