Patent ID: 8676015

Claim:
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; 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; and 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; wherein the optical fiber's 22-meter cable cutoff wavelength (22 m-λ cc ) is about 1150 nanometers or less; and wherein the optical fiber's effective two-meter fiber cutoff wavelength (2 m-λ ceff ) is about 1150 nanometers or less.