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:
Feb. 05, 2002
Filed:
Sep. 21, 1999
Torsten Augustsson, Upplands Väsby, SE;
Telefonaktiebolaget LM Ericsson (publ), Stockholm, SE;
Abstract
The present invention relates to a tuneable add/drop demultiplexer. The add/drop multiplexer includes at least one N×N MMI-waveguide ( ), where N≧3, at least N-number of Michelson waveguides ( and ), at least one Bragg grating ( and ) per Michelson waveguide ( and ) and at least one phase control element ( and ) in at least N−1 number of Michelson waveguides ( and ). The Michelson waveguides ( and ) include said phase control elements ( and ) and said Bragg gratings ( and ) and are coupled to at least one MMI-waveguide ( ). Each Michelson waveguide ( and ) can be provided with a broadband reflection section ( ). The invention also relates to a method for tuneable add/drop multiplexing, the use of a wavelength selective switch as a tuneable add/drop multiplexer and the use of a tuneable add/drop multiplexer as a wavelength selective switch.