A non-zero dispersion shifted optical fiber, comprising: a central core having an outer radius r 1 and a maximum refractive index difference Dn 1 with respect to an outer cladding, said central core's outer radius r 1 is between 1.0 micron and 2.5 microns; a first intermediate cladding positioned between said central core and said outer cladding, said first intermediate cladding having an outer radius r 2 and a refractive index difference Dn 2 with respect to said outer cladding; a buried trench positioned between said first intermediate cladding and said outer cladding, said buried trench having an outer radius r 3, a width w 3, and a negative refractive index difference Dn 3 with respect to said outer cladding; wherein, for a radius of curvature of 30 millimeters at a wavelength of 1625 nanometers, the optical fiber exhibits bending losses of less than 0.5 dB/100 turns; and wherein, at a wavelength of 1550 nanometers, the optical fiber's effective area is 95 μm 2 or greater, wherein the ratio r 2:r 1 of said first intermediate cladding's outer radius r 2 to said central core's outer radius r 1 is between 5 and 9, said buried trench's width w 3 is between 3 microns and 6 microns, and said buried trench's outer radius r 3 is less than 19 microns; said non-zero dispersion shifted optical fiber further comprising a second intermediate cladding positioned between said buried trench and said outer cladding, said second intermediate cladding having an outer radius r 4 and a refractive index difference Dn 4 with respect to said outer cladding, said second intermediate cladding's refractive index difference Dn 4 being between -10.5 x 10 -3 and -6.5 x 10 -3, said second intermediate cladding's outer radius r 4 being 41 microns or less, the difference Dn 2 - Dn 4 between said first intermediate cladding's refractive index difference Dn 2 and said second intermediate cladding's refractive index difference Dn 4 being between 1 x 10 -3 and 2.5 x 10 -3, the difference Dn 3 - Dn 4 between said buried trench's refractive index difference Dn 3 and said second intermediate cladding's refractive index difference Dn 4 being between -15 x 10 -3 and -4 x 10 -3, and the difference Dn 1 - Dn 4 between said central core's maximum refractive index difference Dn 1 and said second intermediate cladding's refractive index difference Dn 4 being between 6.5 x 10 -3 and 10.5 x 10 -3. a central core having an outer radius r 1 and a maximum refractive index difference Dn 1 with respect to an outer cladding, said central core's outer radius r 1 is between 1.0 micron and 2.5 microns; a first intermediate cladding positioned between said central core and said outer cladding, said first intermediate cladding having an outer radius r 2 and a refractive index difference Dn 2 with respect to said outer cladding; a buried trench positioned between said first intermediate cladding and said outer cladding, said buried trench having an outer radius r 3, a width w 3, and a negative refractive index difference Dn 3 with respect to said outer cladding; wherein, for a radius of curvature of 30 millimeters at a wavelength of 1625 nanometers, the optical fiber exhibits bending losses of less than 0.5 dB/100 turns; and wherein, at a wavelength of 1550 nanometers, the optical fiber's effective area is 95 μm 2 or greater, wherein the ratio r 2:r 1 of said first intermediate cladding's outer radius r 2 to said central core's outer radius r 1 is between 5 and 9, said buried trench's width w 3 is between 3 microns and 6 microns, and said buried trench's outer radius r 3 is less than 19 microns; said non-zero dispersion shifted optical fiber further comprising a second intermediate cladding positioned between said buried trench and said outer cladding, said second intermediate cladding having an outer radius r 4 and a refractive index difference Dn 4 with respect to said outer cladding, said second intermediate cladding's refractive index difference Dn 4 being between -10.5 x 10 -3 and -6.5 x 10 -3, said second intermediate cladding's outer radius r 4 being 41 microns or less, the difference Dn 2 - Dn 4 between said first intermediate cladding's refractive index difference Dn 2 and said second intermediate cladding's refractive index difference Dn 4 being between 1 x 10 -3 and 2.5 x 10 -3, the difference Dn 3 - Dn 4 between said buried trench's refractive index difference Dn 3 and said second intermediate cladding's refractive index difference Dn 4 being between -15 x 10 -3 and -4 x 10 -3, and the difference Dn 1 - Dn 4 between said central core's maximum refractive index difference Dn 1 and said second intermediate cladding's refractive index difference Dn 4 being between 6.5 x 10 -3 and 10.5 x 10 -3.