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 800–1650?nm. The 4×4 coupler showed a low insertion loss of 9.9?dB and excess loss of 3.9?dB at 1310?nm. 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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