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. 07, 2017
Filed:
Jul. 10, 2013
Telefonaktiebolaget L M Ericsson (Publ), Stockholm, SE;
Fabio Cavaliere, Pisa, IT;
Alberto Bianchi, Pisa, IT;
Telefonaktiebolaget LM Ericsson (publ), Stockholm, SE;
Abstract
A node () for a single fiber bidirectional WDM optical ring network has a first optical protection switch () having first and second ports for coupling to the single fiber bidirectional ring, while providing a pass through optical path for wavelengths on the bidirectional ring. A further port is coupled to an external optical path. In operation the switch couples optically bidirectional selected wavelengths between the external optical path and either of the first and second ports selectively, according to an indication of a fault on the ring, so as to use different portions of the bidirectional ring respectively as working path and protection path. This combines coupling wavelengths with the ring, with the selection of protection or working path, which simplifies the optical equipment, and upstream and downstream optical delays can be symmetrical.