Optical fiber and method of manufacturing the same

An optical fiber comprising:

• a core having an outer radius r1 and a refractive index n1;
• an inner cladding layer provided on a periphery of the core, the inner cladding layer having an outer radius r2 and a refractive index n2;
• a trench layer provided on a periphery of the inner cladding layer, the trench layer having an outer radius r3 and a refractive index n3;
• and
• an outer cladding layer provided on a periphery of the trench layer, the outer cladding layer having an outer radius r4 and a refractive index n4,
• wherein:
• a maximum refractive index of the core n1max is greater than n2, n3, and n4,
• a minimum refractive index of the trench layer n3min is less than n1, n2, and n4,
• a relative refractive index difference of a minimum refractive index of the trench layer to the refractive index of the outer cladding layer Δ3min is between about −0.30% and about −0.15%,
• a relative refractive index difference of a maximum refractive index of the core to the refractive index of the outer cladding layer Δ1max is from about 0.15% to about 0.32%,
• an effective area Aeff at a wavelength of 1550 nm is from about 100 μm2 to about 140 μm2, and
• a macrobending loss at a wavelength of 1550 nm is less than about 0.5 dB for 10 turns at a bending radius of 15 mm,
• a cable cutoff wavelength is about 1300 nm to about 1500 nm,
• a ratio r2/r1 is from about 3.0 to about 4.5, and
• the outer radius r1 and a ratio of a width of the trench layer to the outer radius of said core w3/r1 meet either one of the following:
• (i) the outer radius r1 is from about 4.0 μm to about 5.0 μm and the ratio w3/r1 is less than about 2.1;
• and
• (ii) the outer radius r1 is from about 5.0 μm to about 6.0 μm and the ratio w3/r1 is more than about 1.6.