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Multiport N × N multimode air-clad holey fiber coupler for high-power combiner and splitter

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Abstract

We report 2×2 and 4×4 multimode air-clad holey fiber couplers fabricated by a novel fusion and tapering technique. The devices showed excellent port-to-port coupling uniformity over a wide spectral range of 8001650nm. The 4×4 coupler showed a low insertion loss of 9.9dB and excess loss of 3.9dB at 1310nm. Because of its unique air cladding and the high numerical aperture of the holey fiber structure, the device showed strong potential in high-power applications.

© 2005 Optical Society of America

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