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. 25, 2003
Filed:
Jan. 16, 2001
Cisco Technology Inc., San Jose, CA (US);
Abstract
A system for providing noise reduction in a long-distance telecommunications system is disclosed. A transmitter generates an optical signal. An optical link includes an optical amplifier that transmits the optical signal in a pre-established direction of propagation with substantially compensated dispersion to have an associated optical noise. A receiver is configured to receive a noisy optical signal including the transmitted optical signal and an optical noise signal. The receiver includes a photodetecting device that is configured to generate an electronic signal correlated with the noisy optical signal. The electronic signal being associated with a quality parameter (Q) that depends on said optical noise signal and distortion of the optical signal in the optical link. The optical link further includes a dispersive and nonlinear filtering device that has a normal dispersion and nonlinear component. The filtering device is placed along said optical link and has an associated normal dispersion parameter &bgr; •L and a nonlinearity parameter &ggr; operatively selected so as to increase the quality parameter by at least 1 dB.