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, 1999
Filed:
Jun. 02, 1997
Ilya M Fishman, Palo Alto, CA (US);
Fishman Consulting, Palo Alto, CA (US);
Abstract
A service restoration system and method for a mixed SONET/WDM optical fiber telecommunication networks comprising a plurality of self healing SONET rings and at least one WDM link which is shared by these SONET rings, provides protection on the optical layer of at least one WDM link in case of fiber or cable cut. The WDM link protection is provided by rerouting the WDM link traffic through a dedicated protection ring which is selected from the plurality of self healing SONET rings, via color blind optical fiber-to-fiber switches. The WDM working equipment protection is provided by rerouting the SONET traffic via additional optical switches and wavelength converters through WDM link. Wavelength converter aligns the wavelength of the optical signal to match the wavelength of failed WDM channel, to localize and heal the failure of the WDM working equipment without reporting to the adjacent nodes.