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:
Jan. 09, 2007
Filed:
Jul. 16, 2002
Suhas Bhandarkar, Alfred, NY (US);
Henry Du, Short Hills, NJ (US);
David Wilfred Johnson, Bedminster, NJ (US);
Deok-yang Kim, New York, NY (US);
Glen R. Kowach, Fanwood, NJ (US);
Suhas Bhandarkar, Alfred, NY (US);
Henry Du, Short Hills, NJ (US);
David Wilfred Johnson, Bedminster, NJ (US);
Deok-Yang Kim, New York, NY (US);
Glen R. Kowach, Fanwood, NJ (US);
Agere Systems Inc., Allentown, PA (US);
Abstract
Silica sol techniques are described for making thick silica or silica based films useful for planar optical waveguides. The process involves coating of a colloidal silica sol onto a substrate, drying the sol, and consolidating the dried sol to form the planar waveguide. Coating is performed in a simple operation, either by dipping, or preferably by spin coating. In a preferred embodiment the substrate is coated with a wetting agent prior to spin coating. It is found that the wetting agent substantially improves the thickness uniformity of the layer. Thick waveguide layers may be produced by repeating the coating process one or more times to produce a layer with the desired thickness. Buried waveguides are produced by forming a doped core layer, patterning the doped core layer and using the coating technique of the invention to form the cladding material.