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:
Jan. 23, 2001
Filed:
Mar. 20, 1998
Kazunori Mukasa, Ichihara, JP;
Yoshihisa Suzuki, Funabashi, JP;
The Furukawa Electric Co. Ltd., Tokyo, JP;
Abstract
The invention relates to a dispersion compensating optical fiber which is connected to a single-mode optical fiber having zero dispersion in the wavelength of 1.31 &mgr;m and has both a dispersion compensating function and a function serving as an optical transmission line, wherein the distribution of refractive indexes of dispersion compensating optical fiber is of W-type profile, the dispersion value in the wavelength of 1.55 &mgr;m is in a range from −20 ms/nm/km or more to −10 ps/nm/km or less, the ratio of dispersion slope to the dispersion value in the wavelength of 1.55 &mgr;m is set to almost the same as the absolute value of the ratio of dispersion slope with the dispersion value in the same wavelength of 1.55 &mgr;m of the single-mode optical fiber while the positive and negative codes thereof are inversed, the specific refractive index difference &Dgr;+ of center core,to clad,is in the range from 1.0% or more to 1.8% or less, the ratio R &Dgr; of the specific refractive index difference &Dgr;− of side core,to clad,with respect to the specific refractive index difference &Dgr;+ is made −0.025 or less, the ratio Ra (Ra=a/b) of center core,to the diameter b of the side core is in a range from 0.3 to 0.4, and the mode field diameter is 6 &mgr;m or more.