Single-mode optical fiber having reduced bending losses

A single-mode optical fiber, comprising:

• a central core surrounded by an outer optical cladding, the central core having a radius r1 and a positive refractive index difference Δn1 with the outer optical cladding;
• an intermediate cladding positioned between the central core and the outer optical cladding, the intermediate cladding having a radius r2 and a refractive index difference Δn2 with the outer optical cladding, wherein the refractive index difference Δn2 is less than the refractive index difference Δn1;
• and
• a depressed trench positioned between the intermediate cladding and the outer optical cladding, the depressed trench having a radius r3 and a negative refractive index difference Δn3 with the outer optical cladding;
• wherein, at a wavelength of 1310 nanometers, the optical fiber has a nominal mode field diameter (MFD) between 8.6 microns and 9.5 microns;
• wherein, at a wavelength of 1550 nanometers, the optical fiber has bending losses of 0.25×10−3 dB/turn or less for a radius of curvature of 15 millimeters;
• and
• wherein, at a wavelength of 1260 nanometers, the LP11 mode of the optical fiber is attenuated to 19.3 dB at a length of less than 90 meters.