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Suppression of Raman gain in single-transverse-mode dual-hole-assisted fiber

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Abstract

Measurements of backscattered Raman amplified spontaneous emission in single-mode dual-hole-assisted fiber indicate suppression of Raman gain by more than two orders of magnitude compared to SMF. These results imply that fiber lasers based on the dual-hole-assisted fiber design are effectively immune to SRS, thus enabling significant power scaling beyond current limits from a single-mode core.

©2005 Optical Society of America

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Figures (5)

Fig. 1.
Fig. 1. Experimental set-up
Fig. 2.
Fig. 2. Spectral transmission of hole-assisted fiber
Fig. 3.
Fig. 3. Raman ASE spectrum of hole-assisted fiber and SMF-28R fiber
Fig. 4.
Fig. 4. Cladding mode intensity distribution plotted vs fiber radius in micron
Fig .5.
Fig .5. Normalized effective area vs fraction of power in the core

Equations (4)

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P ASE h Δ v { Exp [ ( γ R α s ) L ] 1 } 1 α s γ R
γ R = g R P A eff
A eff = I s d A I p d A I s I p d A
P th = A eff g R L eff ( α s L + Log 1 R 1 R 2 )
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