SINGLE-MODE OPTICAL FIBERS WITH LOW CUTOFF WAVELENGTH AND LOW BEND LOSS

An optical fiber having a silica-based core region with an outer radius r1 from about 4.0 microns to about 4.6 microns and a core volume from about 4.5% Δ-micron2 to about 5.5% Δ-micron2. The optical fiber further includes a depressed-index cladding region and an outer cladding region. The depressed-index cladding region having an inner radius r2 such that r1/r2 is greater than about 0.4 and less than about 0.6 and a trench volume between about −50% Δ-micron2s and about −20% Δ-micron2. The optical fiber has a mode field diameter at 1310 nm from about 8.8 microns to about 9.4 microns, a 2 m cable cutoff from about 1120 nm to about 1260 nm, a bending loss at 1310 nm, as determined by the mandrel wrap test using a 15 mm diameter mandrel, of less than 1.0 dB/turn, and a zero dispersion wavelength between 1300 nm and 1324 nm.