| 摘要 |
A non-zero dispersion shifted optical fiber (NZDSF) includes a central core, an inner cladding, and an outer cladding. The central core has an outer radius r 1 , and a maximum refractive index difference Dn 1 with respect to the outer cladding. The inner cladding includes a first intermediate cladding and a buried trench. The first intermediate cladding has an outer radius r 2 and a refractive index difference Dn 2 with respect to the outer cladding. The buried trench has an outer radius r 3 , a width w 3 , and a negative refractive index difference Dn 3 with respect to the outer cladding. In some embodiments, the inner cladding includes a second intermediate cladding having an outer radius r 4 and a refractive index difference Dn 4 with respect to the outer cladding. For a radius of curvature of 30 millimeters at a wavelength of 1625 nanometers, the optical fiber typically exhibits bending losses of about 0.5 dB/100 turns or less. The optical fiber's 22-meter cable cutoff wavelength (22m-» cc ) and effective cutoff wavelength at two meters are typically less than 1150 nanometers. |
