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:
Sep. 19, 1995
Filed:
Apr. 20, 1993
H Paul Maruska, Acton, MA (US);
Spire Corporation, Bedford, MA (US);
Abstract
A monolithic integrated optical heterodyne receiver circuit formed on a single chip and a process of its manufacture are disclosed. The heterodyne receiver circuit essentially includes a tunable local oscillator formed on a substrate for generating a first light beam, a first waveguide coplanarly formed on the substrate adjacent to the local oscillator for transmitting the first light beam, a second waveguide formed on top of the first waveguide for receiving and transmitting an information-encoded second light beam, a coupler region sandwiched between the first and second waveguides for mixing the two light beams, and a pair of detectors mounted in electrical series with one another for converting the mixed light beams to a radio frequency signal operating at an intermediate frequency.