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Narrow Linewidth Bismuth-Doped All-Fiber Ring Laser

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5 Author(s)
Kelleher, E.J.R. ; Dept. of Phys., Imperial Coll. London, London, UK ; Travers, J.C. ; Golant, K.M. ; Popov, S.V.
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We report a novel narrow linewidth Bismuth-doped all-fiber ring laser, operating at 1177 nm. We achieve a 10-mW output in a 4-GHz linewidth, direct from the oscillator under 7 W of pumping, delivered by an Yb-fiber laser. Mode suppression in the 50-m unidirectional ring cavity is provided by a narrowband fiber Bragg grating and two fiber integrated Fabry-Perot (FP) filters. The FP filters provide a factor of 20 mode suppression, while improving the relative intensity noise by up to 20 dB/Hz. The optical signal-to-noise ratio (OSNR) is ~60 dB.

Published in:

Photonics Technology Letters, IEEE  (Volume:22 ,  Issue: 11 )