Optical fiber cable with high fiber count

An optical fiber comprising:

• a core region, the core region comprising silica glass doped with an alkali metal oxide, the core region having a radius r1 in the range from 3.0 μm to 10.0 μm and a relative refractive index profile Δ1 having a maximum relative refractive index Δ1max in the range from −0.15% to 0.30%;
• and
• a cladding region surrounding and directly adjacent to the core region, the cladding region having a radius r4 in the range from 37.5 μm to 62.5 μm;
• and
• a primary coating surrounding and directly adjacent to the cladding region, the primary coating having a radius r5, an in situ modulus in the range from 0.05 MPa to 0.30 MPa and a thickness r5−r4 in the range from 8.0 μm to 20.0 μm;
• and
• a secondary coating surrounding and directly adjacent to the primary coating, the secondary coating having a radius r6 less than or equal to 100.0 μm, a Young's modulus greater than 1600 MPa and a thickness r6−r5 in the range from 8.0 μm to 20.0 μm;
• and
• wherein the optical fiber has a wire-mesh covered drum microbending loss at 1550 nm of less than 1.0 dB/km.