Accession Number : ADP008157

Title :   Performance and Modeling of Proton Exchanged LiTaO3 Modulators,

Corporate Author : SFA INC LANDOVER MD

Personal Author(s) : Howerton, M. M. ; Burns, W. K. ; Moeller, R. P.

Report Date : APR 1992

Pagination or Media Count : 2

Abstract : LX2 BRANCHING MODULATORS AND 2X2 DIGITAL SWITCHES ARE OF INTEREST DUE TO THEIR STEP-LIKE RESPONSE. We report results on branching modulators at 0.83 micrometers which were made by the annealed proton exchange process in LiTaO3 in order to take advantage of its superior photorefractive behavior. The modulators are intended for use in a space communications program. Adiabatic devices have been modeled by direct calculation with step models, the beam propagation method, Fourier analysis, and by approximate methods using normal modes represented from coupled mode theory (CMT). We focus on the latter approach here as it is simple to use and required CMT parameters can be experimentally obtained. We show that the model gives a reasonable description of the experimental results. We also demonstrate that crosstalk in these devices (with linear branches) is linearly proportional to the voltage-length product.

Descriptors :   *ELECTRONIC SWITCHES, CROSSTALK, EXCHANGE, FOURIER ANALYSIS, LENGTH, MICROMETERS, MODELS, PARAMETERS, PROPAGATION, PROTONS, SPACE COMMUNICATIONS, THEORY, VOLTAGE, LITHIUM TANTALATES, LIGHT MODULATORS.

Subject Categories : Electrooptical and Optoelectronic Devices

Distribution Statement : APPROVED FOR PUBLIC RELEASE