Bandwidth-Maintaining Multimode Optical Fibers

A bend resistant multimode optical fiber comprising a core region with a first radius a1 and a profile alpha, wherein alpha is a core shape profile parameter and defines a shape of a graded refractive index profile of the multimode optical fiber, an inner cladding extending radially from first radius a1 to second radius a2 wherein there is substantially a constant refractive index from first radius a1 to second radius a2, a trench extending radially from second radius a2 to a third radius a3, and an outer cladding extending to a fourth radius a4, wherein a maximum refractive index of the core region is d1, a refractive index of the inner cladding is d2, a refractive index of the trench is d3, and a refractive index of the outer cladding is d4, wherein:

• a1 is 7-50 microns;
• alpha is 1.6 to 2.2;
• (a2−a1)/a1 is 0.4 to 0.7;
• (a3−a2)/a1 is 0.086 to 0.7;
• a4 is 30-250 microns;
• d1-d4 is −0.019 to 0.032;
• d2-d4 is −0.01 to 0.01;
• d3-d4 is −0.05 to −0.0025;
• and
• d4 is 1.397 to 1.511,
• wherein the multimode optical fiber that exhibits a change in differential mode delay measured as bend mode performance of less than 0.07 picoseconds per meter from an unbent state to bent state, given a reference state of 2 turns around a 10 mm diameter.