Accession Number : ADD017760

Title :   Adaptive Polarization Diversity Detection Scheme for Coherent Communications and Interferometric Fiber Sensors.

Descriptive Note : Patent, Filed 2 Feb 90, patented 8 Aug 95,

Corporate Author : DEPARTMENT OF THE NAVY WASHINGTON DC

Personal Author(s) : Kersey, Alan D ; Marrone, Michael J

Report Date : 08 Aug 1995

Pagination or Media Count : 12

Abstract : A method and apparatus for overcoming polarization induced signal fading in both heterodyne communication and interferometric sensing. An adjustable birefringent element in series with a linear polarization beam splitter forms an elliptical polarization beam splitter. The birefringent element controllably evolves the states of polarization of two input signals thereby controlling the power contribution of each signal onto the orthogonal axes used by the linear beam splitter. When the states of polarization are evolved such that there are equal signal to reference power ratios on the beam splitter axes, subsequent detectors generate a constant, optimum amplitude signal without the need for weighting or decision circuits.

Descriptors :   *RECEIVERS, *OPTICAL CIRCUITS, *PATENTS, FIBER OPTICS, LINEAR SYSTEMS, POLARIZATION, OPTIMIZATION, HETERODYNING, DECISION MAKING, COHERENCE, BEAM SPLITTING, INTERFEROMETRY, SIGNALS, AXES, BIREFRINGENCE, COMMUNICATION AND RADIO SYSTEMS, AMPLITUDE, ORTHOGONALITY, ELLIPSES

Subject Categories : Optical Detection and Detectors

Distribution Statement : APPROVED FOR PUBLIC RELEASE