Accession Number : ADD014600

Title :   Apparatus and Method for Minimizing Polarization-Induced Signal Fading in an Interferometric Fiber-Optic Sensor Using Input-Polarization Modulation.

Descriptive Note : Patent, filed 21 Jul 89, patented 12 Jun 90,

Corporate Author : DEPARTMENT OF THE NAVY WASHINGTON DC

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

Report Date : 12 Jun 1990

Pagination or Media Count : 1

Abstract : An apparatus for minimizing polarization-induced signal fading in an interferometric fiber-optic sensor is disclosed. The apparatus includes an optical source for providing an input light beam, a polarization modulator for modulating the state of polarization of the input light beam into at least three states represented by mutually perpendicular polarization vectors on a Poincare Sphere. The apparatus further includes means for conveying the input light beam with the at least three mutually perpendicular modulated states of polarization to the fiber-optic sensor, the interferometric fiber-optic sensor being responsive to the input light beam with modulated polarization states for developing an interference pattern output, wherein the interference pattern output has at least three visibilities corresponding to the input states of polarization. A photodetector is responsive to the interference pattern output for developing an electrical signal having at least three amplitudes corresponding to the at least three states of polarization. Patents. (jhd)

Descriptors :   *FIBER OPTICS, *PHASE MODULATION, *PATENTS, *PHOTODETECTORS, *POLARIZATION, AMPLITUDE, DETECTORS, ELECTRICITY, INPUT, INTERFERENCE, INTERFEROMETRY, LIGHT, MODULATION, MODULATORS, OUTPUT, PATTERNS, SIGNALS, SPHERES

Subject Categories : Fiber Optics and Integrated Optics

Distribution Statement : APPROVED FOR PUBLIC RELEASE