The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Mar. 02, 1999
Filed:
Jun. 05, 1997
David W Peckham, Norcross, GA (US);
Lucent Technologies Inc., Murray Hill, NJ (US);
Abstract
An optical fiber is disclosed that is suitable for use in wave-division-multiplex (WDM) systems served by Erbium-doped fiber amplifiers. The fiber has a chromatic dispersion whose absolute magnitude is at least 0.8 ps/(nm-km) over the wavelength region 1530-1565 nm, and has a dispersion slope that is less than 0.05 ps/(nm.sup.2 -km). This optical fiber exhibits a loss that is less than about 0.20 dB/km and is relatively insensitive to bending; moreover, its effective area exceeds 50 .mu.m.sup.2. The optical fiber includes a core of transparent material having a maximum refractive index n.sub.1, and a layer of transparent cladding material on the outer surface of said core having a refractive index n.sub.2. The core includes an annular region of transparent material whose minimum refractive index, n.sub.3, is depressed with respect to n.sub.2. These indexes are constrained by the following equations: 0.50<(n.sub.1 -n.sub.2)/n.sub.2 <0.70; and -0.30<(n.sub.3 -n.sub.2)/n.sub.2 <-0.05.