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:
Oct. 29, 2002
Filed:
Apr. 26, 2000
Torsten Augustsson, Upplands Väsby, SE;
Telefonaktiebolaget LM Ericsson (publ), Stockholm, SE;
Abstract
The present invention relates to a device and to a method for the wavelength selective filtration of optical wavelength channels. The device includes at least one 3 dB-coupler or at least one Q port circulator ( ), where Q≧3, a 1×N WDM-(de)multiplexer ( ), where N≧2, N number of waveguides ( and ), at least N number of reflection sections ( and ) and at least N number of variable optical attenuators ( and ). One of the ports on the circulator ( ) or on the 3 dB-coupler is connected to a first side of the WDM-(de)multiplexer ( ). Each waveguide ( and ) includes at least one variable optical attenuator ( and ) and at least one reflection section ( and ), such that at least one variable optical attenuator ( and ) will be located between a reflection section ( and ) and the WDN-(de)multiplexer ( ).