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:
Feb. 17, 2004
Filed:
Apr. 05, 2001
Harold Yoonsung Hwang, Jersey City, NJ (US);
Markus J P Siegert, Cologne, DE;
Lucent Technologies Inc., Murray Hill, NJ (US);
Abstract
An optical device comprises a body of ferroelectric material exhibiting an effective electro-optic coefficient (r ) and an optical loss (&agr;), with the body being adapted for the propagation of optical radiation at a wavelength &lgr; through it, and means for applying an electric field to the body in order to alter the refractive index therein, characterized in that the body is polycrystalline and has an average grain size such that r is relatively high and &agr; is relatively low, both at &lgr; . In a preferred embodiment the body has an average grain size that is less than about &lgr; /10, preferably in the range of approximately 8-20 nm, which is especially well suited for devices operating at near infrared wavelengths in the range of about 1000-1600 nm. Illustratively, the ferroelectric body is a perovskite material such as barium titanate or lithium niobate.