A disclosed multimode optical fiber comprises a core and a cladding surrounding the core. The core has an outer radius r1 in between 20 μm and 30 μm. The cladding includes a first outer cladding region having an outer radius r4a and a second outer cladding region having an outer radius r4b less than or equal to 45 μm. The second outer cladding region comprises silica-based glass doped with titania. The optical fiber further includes a primary coating with an outer radius r5 less than or equal to 80 μm, and a thickness (r5−r4) less than or equal to 30 μm. The optical fiber further includes a secondary coating with an outer radius r6 less than or equal to 100 μm. The secondary coating has a thickness (r6−r5) less than or equal to 30 μm, and a normalized puncture load greater than 3.6×10−3 g/micron2.