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. 09, 1993
Filed:
Dec. 22, 1992
Craig D Poole, Ocean, NJ (US);
AT&T Bell Laboratories, Murray Hill, NJ (US);
Abstract
An optical fiber communication system according to the invention comprises, in addition to conventional single mode (SM) optical fiber, dispersion compensating (DC) optical fiber. The DC fiber is selected such that its chromatic dispersion (D.sub.DC (.lambda.)) and first derivative of the chromatic dispersion with respect to wavelength (D'.sub.DC (.lambda.)) at a wavelength .lambda.=.lambda..sub.op have opposite sign from those of the SM fiber. Advantageously, the DC fiber is selected such that L.sub.DC .multidot.D.sub.DC (.lambda.)+L.multidot.D(.lambda.) is approximately zero at .lambda.=.lambda..sub.op, and such that D'.sub.DC (.lambda.) is approximately equal to --(L/L.sub.DC).multidot.D'(.lambda.) at .lambda.=.lambda..sub.op, where L.sub.DC and L are appropriate lengths of DC and SM fiber, respectively. Typically, L is much greater than L.sub.DC, and .lambda..sub.op typically is about 1.5 .mu.m, e.g., about 1.56 .mu.m. Preferred embodiments of the invention have low chromatic dispersion over a substantial wavelength region (e.g., dispersion less than 1.5 ps/nm.multidot.km over at least 50 nm) that includes .lambda..sub.o, facilitating wavelength division multiplexing.