Accession Number : ADD017590
Title : Broadband, Low Drive Voltage, Electrooptic, Integrated Optical Modulator.
Descriptive Note : Patent, Filed 14 Apr 93, patented 16 May 95,
Corporate Author : DEPARTMENT OF THE NAVY WASHINGTON DC
Personal Author(s) : Burns, William R ; Bulmer, Catherine H ; Gopalakrishnan, Ganesh K
Report Date : 16 May 1995
Pagination or Media Count : 19
Abstract : A broadband, electrooptic modulator is disclosed which, in a first embodiment, comprises: a substrate having substrate modes, having electrooptic effects, and having a first optical waveguide adapted to receive and transmit light therethrough in a first direction and with a first phase velocity; a buffer layer disposed on the substrate; and a coplanar waveguide electrode structure having a coplanar mode and being disposed on the buffer layer for receiving an electrical signal propagating therethrough in the first direction with a second phase velocity to phase modulate the light in the optical waveguide at a frequency in the range from 0 Hz up to substantially 40 GHz. The substrate has a sufficiently small thickness so that coupling between the coplanar mode of the coplanar waveguide electrode structure and any one of the substrate modes of the substrate substantially does not occur over a desired frequency bandwidth of operation, and the coplanar waveguide electrode structure has a sufficiently large thickness so that the second phase velocity of the electrical signal is substantially equal to the first phase velocity. In a second embodiment of the invention an intensity modulator is produced by adding a second optical waveguide which, in combination with the first optical waveguide, forms an interferometer.
Descriptors : *ELECTROOPTICS, *OPTICAL WAVEGUIDES, *OPTICAL INTERFEROMETERS, *LIGHT MODULATORS, *PATENTS, BUFFERS, THICKNESS, LAYERS, VOLTAGE, SUBSTRATES, ELECTRODES, PLANAR STRUCTURES, BROADBAND, OPERATION, DRIVES(ELECTRONICS), LOW VOLTAGE, PHASE VELOCITY
Subject Categories : Electrooptical and Optoelectronic Devices
Distribution Statement : APPROVED FOR PUBLIC RELEASE