Reduced diameter multi mode optical fibers with high mechanical reliability

A multimode optical fiber, comprising:

• a core region having an outer radius r1 in a range from 20 microns to 30 microns;
• a cladding region surrounding and directly adjacent to the core region, the cladding region including a first outer cladding region having an outer radius r4a and a second outer cladding region surrounding and directly adjacent to the first outer cladding region and having an outer radius r4b, wherein the second outer cladding region comprises silica-based glass doped with titania and r4b is less than or equal to 45 microns;
• a primary coating with an outer radius r5 less than or equal to 80 microns surrounding and directly adjacent to the cladding region, the primary coating having a thickness (r5−r4) less than or equal to 30 microns;
• and
• a secondary coating with an outer radius r6 less than or equal to 100 microns surrounding and directly adjacent to the primary coating, the secondary coating having a thickness (r6−r5) less than or equal to 30 microns, and a normalized puncture load greater than 3.6×10−3 g/micron2.