| 摘要 |
A dispersion shifted optical fiber (NZDSF) comprises a central core (r1,Dn1), an inner cladding having at least three zones with a first intermediate cladding zone (r2,Dn2), a second ring zone (r3,Dn3) and a third buried trench zone (Wtr,Dnt). The buried trench zone has an index difference (Dnt) with the optical cladding comprised between -5.10 -3 and -15.10 -3 and has a width (Wtr) comprised between 2.5 µm and 5.5 µm. The fiber comprises further a fourth inner cladding zone located between the ring zone (r3,Dn3) and the buried trench zone (Wtr,Dnt), having a radius (r4) and an index difference (Dn4) with the optical cladding comprised between - 2.5x10 -3 and 1.10 -3 . The proposed optical fiber has reduced Rayleigh scattering losses, of less than 0.164 dB/km at the wavelength of 1,550 nm, with limited bending losses.
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