Abstract

We present an ultrafine tunable single-frequency Brillouin fiber laser in which the fiber Brillouin gain also acts as a high-precision tunable filter. Controlling the strain on the fiber, the Stokes frequency shift may be precisely changed, and thus the lasing frequency can be tuned. Assisted by the frequency pulling effect, this method provides continuous ultrafine tuning ability for 30% of the free spectral range without mode hopping, and can cover 271MHz. The experiments showed that the laser achieves tuning step of 60kHz.

© 2011 Optical Society of America

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