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Multicore rare earth doped fibres; application to amplifiers, filters and lasers

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Figure

Figure 2 shows an end picture of an optimised twincore fibre.  Herethe outer fibre diameter is ~125 microns,  the core NAs are 0.23with 1.4 micron radii and 4.5 micron core separation
Figure 3(a,b): Spectral holes for co- and counter- pumped amplifiers
Figure 5 (a-c): Output powers for theTC-EDFA and conventional EDFA link
Figure 8: 8 channel output of TC-EDFlaser
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