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:
Dec. 15, 2009
Filed:
Oct. 06, 2004
Ornan Gerstel, Los Altos, CA (US);
Stefano Piciaccia, Milan, IT;
Mauro Macchi, Varese, IT;
Mauro Rudi Casanova, Milan, IT;
Ronald Johnson, San Ramon, CA (US);
Ornan Gerstel, Los Altos, CA (US);
Stefano Piciaccia, Milan, IT;
Mauro Macchi, Varese, IT;
Mauro Rudi Casanova, Milan, IT;
Ronald Johnson, San Ramon, CA (US);
Cisco Technology, Inc., San Jose, CA (US);
Abstract
A reconfigurable WDM add/drop multiplexer and its method of operation at an add/drop node on an optical fiber carrying a plurality of WDM signals is described. The WDM add/drop multiplexer has a coupler and a demultiplexer element dropping WDM signals from the optical fiber to a plurality of drop terminals, and a wavelength-selective switch adding WDM signals from a plurality of add terminals onto the optical fiber. The coupler splits the WDM signals received from the optical fiber and passes the split WDM signals to the first and second output terminals. The demultiplexer element separates the split WDM signals at the plurality of drop terminals. The wavelength-selective switch, which has an input terminal for connection to the second coupler output terminal and an output terminal for connection to the optical fiber, selectively adds WDM signals on the plurality of add terminals to the optical fiber responsive to control signals.