Bend Resistant Multimode Optical Fiber

An optical fiber which is multimoded at 850 nm, comprising a graded index multimode glass core having an optical core radius between 21 and 27 microns and a maximum refractive index delta at 850 nm, Δ1MAX, a depressed index annular region surrounding said multimode core exhibiting minimum refractive index delta at 850 nm, Δ2MIN, wherein the inner boundary of said depressed index region is an extension of the graded index core, the depressed region having a moat volume greater than 105%-um2, and an outer cladding region surrounding said depressed index region and exhibiting a refractive index delta at 850 nm, Δ3, wherein Δ1MAX>Δ3 >Δ2MIN, and wherein the fiber exhibits (a) an overfilled bandwidth of greater than 1.5 GHz-km at a wavelength of 850 nm, and (b) a 1 turn 10 mm diameter mandrel wrap attenuation increase at a wavelength of 1550 nm of less than 0.28 dB.