Dispersion compensating fibre (DCF) and high NA fibre (HNA) can be fusion spliced to standard communications single mode fibre (SMF) with considerably reduced splice losses if the cores on both sides of the splice are adiabatically diffused. Overall losses of 0.2 dB and 0.05 dB for DCF/SMF and HNA/SMF splices, respectively, have been repeatably achieved with this technique. With an alternative adiabatic splice fattening technique, small diameter fibre (80/5.3 μm) can be fusion spliced to standard communications fibre (125/9.5μm) with losses as low as 0.6 dB.
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