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. 23, 2008
Filed:
May. 18, 2004
Timo Aalto, Espoo, FI;
Timo Aalto, Espoo, FI;
Valtion Teknillinen Tutkimuskeskus, Espoo, FI;
Abstract
A structure comprises an inner strip waveguide () and an outer rib waveguide () on a common substrate. The thicker inner waveguide () is patterned into an inner core layer (). The thinner outer waveguide () is patterned into an outer core layer (). The inner and outer waveguides are separated by a gap () being less than 500 nm. The structure forms an adiabatic coupler. In the method, the first (inner) waveguide () is patterned into the thicker inner core layer () by etching trenches (). A thinner outer silicon layer () is attached on top of the inner-core layer () and the first waveguide () to form an outer core layer (). The second (outer) waveguide () is patterned into the outer core layer ().