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. 12, 2002
Filed:
May. 05, 2000
William K. Burns, Alexandria, VA (US);
The United States of America as represented by the Secretary of the Navy, Washington, DC (US);
Abstract
A low loss coplanar waveguide horn with low drive voltage LiNbO modulators wherein the electrical transmission of the traveling wave electrode structure, and of the input and output coupling structures, sometimes called the “horn”, which transition the active electrode structure with microwave connectors, is maximized by an appropriate design of the horn structure. The conflicting requirements of the leaky mode loss and maintaining sufficient size to allow microwave connection, can be reconciled by an adjustment of the ground plane width, which also effects the magnitude of coupling of the guided mode to substrate modes. Control of both the maximum horn size and the width of the ground planes in particular modulator electrode structures can provide operation to 40 GHz in LiNbO devices with substrate thicknesses of ˜≦1.0 mm, without excess leaky mode loss. The horn structures are ≦3 mm long and the active waveguides are ˜4-5 cm long. They are made on Z-cut LiNbO , with electroplated gold CPW electrodes of 10-30 &mgr;m thickness.