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:
Nov. 27, 2018
Filed:
Dec. 30, 2015
Stmicroelectronics SA, Montrouge, FR;
Stmicroelectronics (Crolles 2) Sas, Crolles, FR;
STMICROELECTRONICS SA, Montrouge, FR;
STMICROELECTRONICS (CROLLES 2) SAS, Crolles, FR;
Abstract
A method is for making a photonic chip including EO devices having multiple thicknesses. The method may include forming a first semiconductor layer over a semiconductor film, forming a second semiconductor layer over the first semiconductor layer, and forming a mask layer over the second semiconductor layer. The method may include performing a first selective etching of the mask layer to provide initial alignment trenches, performing a second etching, aligned with some of the initial alignment trenches and using the first semiconductor layer as an etch stop, to provide multi-level trenches, and filling the multi-level trenches to make the EO devices having multiple thicknesses.