Low-diameter optical fiber with low bend loss at large and small bend diameter, and intermediate effective area

An optical fiber comprising:

• a core region, the core region having a radius r1 in a range from 5.5 μm to 9.0 μm and a relative refractive index profile Δ1 having a maximum relative refractive index Δ1max in a range from −0.05% to 0.05%;
• a cladding region surrounding and directly adjacent to the core region, the cladding region comprising:
• a trench cladding region surrounding the core region, the trench cladding region comprising silica glass and having a radius r3, a relative refractive index Δ3, and a trench volume less than 20% μm2;
• and
• an outer cladding region surrounding and directly adjacent to the trench cladding region, the outer cladding region comprising silica glass having a radius r4 and a relative refractive index Δ4 in a range from −0.40% to −0.20%;
• and
• a coating surrounding and directly adjacent to the outer cladding region, the coating having an outer radius less than or equal to 110 μm;
• and
• wherein the optical fiber has an effective area at 1550 nm in the range from 115 μm2 to 135 μm2;
• a macrobend loss at 1550 nm, as determined by a mandrel wrap test using a mandrel with a diameter of 32 mm, less than 0.300 dB/turn;
• a macrobend loss at 1550 nm, as determined by a mandrel wrap test using a mandrel with a diameter of 50 mm, less than 0.030 dB/turn;
• and a microbend loss at 1550 nm, as determined by winding at a tension of 30 g about a drum having a radius of 153 mm covered with sandpaper (40 micron, Al2O3), less than 3.0 dB/km.