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:
Aug. 19, 1997
Filed:
Jan. 26, 1995
Jean-Francedilla.ois Vinchant, Bruyeres le Chatel, FR;
Pierre Doussiere, Saint Germain les Arpajon, FR;
Alcatel N.V., Rijswijk, NL;
Abstract
The invention concerns an optical waveguide transition and its fabrication method, enabling coupling between a buried optical waveguide and a ridged optical waveguide. The transition structure is formed during etching of a layer containing the buried optical waveguide, the transition area being formed by adiabatically increasing the lateral dimensions of the buried waveguide. Top layers are deposited on the buried waveguide and its widened structure in the transition area, and the ridged optical waveguide is fabricated with one part on top of the transition area. Coupling of the respective propagation modes in the buried and ridged waveguides is effected by mode adaptation in the region between the two waveguide structures in the transition area. The transition of the invention is made in two conventional epitaxy steps.