Experimental characterisation of Raman gain efficiency of holey fibre

摘要

The Raman gain efficiency of a 2.3 /spl mu/m-core-diameter holey fibre was measured using three different techniques. A /spl sim/4.65/spl times/10/sup -3/ W/sup -1/ m/sup -1/ efficiency is obtained by all techniques with mismatches lying within the estimated errors. It is shown that the high efficiency is due to small mode-field diameter of the holey fibre, as expected. The use of the fibre as a continuous-wave-pumped Raman amplifier is discussed.