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:
Nov. 19, 2002
Filed:
Apr. 27, 2001
Lucas Hsu, Allentown, PA (US);
David W Peckham, Lawrenceville, GA (US);
William Alfred Reed, Summit, NJ (US);
Man Fei Yan, Berkeley Heights, NJ (US);
Fitel USA Corp., Norcross, GA (US);
Abstract
Embodiments of the invention include an optical communications system including one or more optical transmission devices, one or more optical receiving devices, and at least one positive dispersion optical fiber coupled therebetween. The fiber includes a doped core region with an index of refraction n , a cladding region with an index of refraction n , and first and second annular rings or regions therebetween with indices of refraction n and n , respectively. The various regions are manufactured in such a way that the refractive index value ranges are: 0.14<(n −n )/n <0.31, −0.19<(n −n )/n <−0.02, and −0.20<(n −n )/n <−0.08. The fibers exhibit a chromatic dispersion greater than 20±2.0 ps/(nm-km) and a dispersion slope less than 0.062 ps/(nm -km) at a wavelength of 1550 nm. Also, the fibers have a relatively large effective core area, A , e.g., greater than 100.0 &mgr;m , and a relative dispersion slope (RDS) less than 0.0032 nm . The mode field diameter (MFD) is at least 11.9±0.7 &mgr;m. These desirable transmission characteristics are achieved without many of the manufacturing and economic limitations of conventional fibers.