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:
May. 16, 1995
Filed:
Aug. 25, 1993
Applicant:
Inventor:
Olof G Sahlen, Solna, SE;
Assignee:
Telefonaktiebolaget L M Ericsson, Stockholm, SE;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
G02B / ;
U.S. Cl.
CPC ...
385 37 ; 385 14 ; 385 27 ; 385 41 ; 385 42 ; 385131 ;
Abstract
A tunable optical filter device has a wavelength selective optical filter that includes a grating structure arranged in a waveguide structure. The grating structure is formed so that it comprises two controllable grating sections electrically isolated from each other and which have different grating periods.