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:
Apr. 23, 2002
Filed:
Feb. 26, 1999
Victor Mizrahi, Columbia, MD (US);
Ciena Corporation, Linthicum, MD (US);
Abstract
A WDM ring transmission system is provided whereby each optical signal is first dropped from the ring, supplied to an amplifier, and then input to an optical receiver. Typically, a filtering element is also provided either prior to or after the amplifier. The amplifier increases the power of the transmitted optical signal so that the optical signals can be transmitted over greater distances, and the filtering element minimizes any adjacent channel cross-talk light fed to the receiver. Moreover, since the amplifier only amplifies the dropped channel, excessive noise accumulation due to non-uniform spectral gain can be avoided. In addition, channels can be arbitrarily assigned to add/drop elements along the ring. A simplified amplifier design is further disclosed.