| 摘要 |
A single-mode optical fiber includes a central core, an intermediate cladding, a depressed trench, and an external optical cladding. The central core has a radius r1 and a positive refractive index difference &Dgr;n1 with the optical cladding. The intermediate cladding has a radius r2 and a refractive index difference &Dgr;n2 with the optical cladding, wherein &Dgr;n2 is less than the central core's refractive index difference &Dgr;n1. The depressed trench has a radius r3 and a negative index difference &Dgr;n3 with the optical cladding. The optical fiber has a nominal mode field diameter (MFD) between 8.6 microns and 9.5 microns at a wavelength of 1310 nanometers, and at a wavelength of 1550 nanometers, the optical fiber has bending losses less than 0.15 dB/turn for a radius of curvature of 5 millimeters and cable cut-off wavelengths of less than or equal to 1260 nanometers.
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