We report the fabrication of a new type of optical waveguide: the phot
onic crystal fiber. It consists of a pure silica core surrounded by a
silica-air photonic crystal material with a hexagonal symmetry. The fi
ber supports a single robust low-loss guided mode over a very broad sp
ectral range of at least 458-1550 nm. (C) 1996 Optical Society of Amer
ica