Abstract
A side-pump coupler with a refractive index valley was investigated
theoretically and experimentally. The high pump coupling efficiency and the
suppression of backward light propagation due to the refractive index valley
are illustrated. Based on the analysis, the
$(2+1) \times 1$
pump and signal coupler
with both pump coupling efficiency and signal transfer efficiency of
$> 96\%$
and the BR of 2.82 was implemented, which accompanied
with the maximum pump power of 398 W. And based on these couplers, an all-fiber
bi-directionally pumping MOPA laser with an output power of 256 W and optical-optical
efficiency of 80.5% was achieved in the experiment.
© 2013 USGov
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