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:
Dec. 28, 2004
Filed:
Nov. 12, 2002
Sumitomo Electric Industries, Ltd., Osaka, JP;
Abstract
An optical fiber preform having a low core noncircularity and eccentricity for producing an optical fiber having an improved polarization mode dispersion, a method for producing the preform, and an optical fiber produced from the preform. The optical fiber preform is produced by the following steps. Diameter-reduced portions and are formed in the vicinity of the ends of the glass pipe . A glass rod is inserted into the glass pipe . The glass rod is fixed to the glass pipe at the diameter-reduced portion . The glass pipe and the glass rod are heat-unified from the diameter-reduced portion forward to the diameter-reduced portion . The optical fiber preform has a core noncircularity of at most 1.5%. The optical fiber has a polarization mode dispersion of at most 0.15 ps/km at a wavelength of 1,550 nm.