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:
Jun. 26, 2018
Filed:
Mar. 24, 2014
Telefonaktiebolaget Lm Ericsson (Publ), Stockholm, SE;
Giulio Bottari, Pisa, IT;
Luca Giorgi, Pisa, IT;
Peter Öhlén, Stockholm, SE;
Björn Skubic, Stockholm, SE;
Telefonaktiebolaget LM Ericsson (publ), Stockholm, SE;
Abstract
An optical communications network has an interconnecting node () coupled in between at least one hub node () and at least first () and second () access nodes, to provide working and protection optical paths. The interconnecting node has a working wavelength selective switch () to select which working wavelengths are coupled. A corresponding protection wavelength selective switch () is also provided for the protection wavelengths. In the event of detection of a fault, protection switching () is carried out at the access node and the hub node without altering the selections made by the wavelength selective switches in the interconnecting node. Thus protection schemes across the interconnecting node for more than one access node can be handled. By not needing to alter wavelength selections at the interconnecting node during protection switching operation, the complexity and thus costs can be reduced.