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:
Sep. 24, 2002
Filed:
Oct. 01, 1999
Torsten Augustsson, Upplands Väsby, SE;
Telefonaktiebolaget LM Ericsson, Stockholm, SE;
Abstract
The present invention relates to an arrangement and to a method for wavelength selecting transmission, said arrangement comprising two N×N MMI waveguides ( and ), where N≧2, 2 (N−1) number of lasers ( and ) and N-number of Mach-Zehnder waveguides ( and ). A first N×N MMI waveguide ( ) is coupled with N−1 number of lasers ( ) and a free access waveguide ( ) on a first side, and N-number of Mach-Zehnder waveguides ( and ) of mutually different lengths on a second side. The free access waveguide ( ) is coupled with a last port (a ) on the first side of the first MMI waveguide ( ). A second N×N MMI waveguide ( ) is coupled with said N-number of Mach-Zehnder waveguides ( and ) on a second side and N−1 number of lasers ) and a free access waveguide ( ) on a first side, where N−1 number of Mach-Zehnder waveguides ( and ) include a trimming section ( and ). The free access waveguide ( ) is coupled with a first port (a ) on the first side of the second MMI waveguide ( ). A first to a last Mach-Zehnder waveguide ( and ) are arranged between a first to a last port (b , b , b , b and b ) on a second side of the first MMI waveguide ( ) and a last to a first port (b , b , b , b and b ) on a second side of the second MMI waveguide ( ).