Gradient-index fiber lenses are used to fabricate high-strength (> 100 kpsi) fusion splices between microstructured optical fibers. High coupling efficiencies are attainable (< 0.6 dB loss), providing the mode field diameter is at least about 3.5 μm.|Gradient-index fiber lenses are used to fabricate high-strength (> 100 kpsi) fusion splices between microstructured optical fibers. High coupling efficiencies are attainable (< 0.6 dB loss), providing the mode field diameter is at least about 3.5 μm.

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