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:
Mar. 05, 1991
Filed:
Jan. 04, 1990
Richard E DuPuy, Aloha, OR (US);
Leon McCaughan, Madison, WI (US);
Edwin B Osgood, Beaverton, OR (US);
Smiths Industries Aerospace & Defense Systems Incorporated, Grand Rapids, MI (US);
Abstract
An electrooptical device comprises a substrate of electrooptic material having first, second and third optical waveguide formed therein. The first and second waveguides have first and second waveguide segments respectively, and the third waveguide has third and fourth waveguide segments extending adjacent the first and second waveguide segments respectively, so that first and second directional couplers are formed. The interaction length of the first directional coupler is slightly greater than an optimum interaction length for a predetermined wavelength and the interaction length of the second directional coupler is slightly less than an optimum interaction length for the predetermined wavelength. A first electrode structure influences the first directional coupler and a second electrode structure influences the second directional coupler. Potentials can be applied to the first and second electrode structures such that for the predetermined wavelength first and second states of the device can be established in which polarized light is propagated from one end of the first waveguide to one end of the second waveguide with higher and lower transmissions respectively and the transmission in the first state is substantially independent of the polarization eigen state.