Accession Number : ADD017415

Title :   Demodulators for Optical Fiber Interferometers with (3 x 3) Outputs.

Descriptive Note : Patent, Filed 17 Aug 92, patented 17 May 94,

Corporate Author : DEPARTMENT OF THE NAVY WASHINGTON DC

Personal Author(s) : Keolian, Robert M ; Garrett, Steven L ; Cameron, Charles B

Report Date : 17 May 1994

Pagination or Media Count : 41

Abstract : A highly sensitive optical fiber interferometer sensor comprising a laser light source, a (2 x 2) optical fiber coupler to split the beam in two, a differential transducer which converts a signal of interest into optical phase shift in the laser light transmitted through the two optical fibers in the interferometer and a (3 x 3) optical fiber complex which recombines the two beams, producing interference which can be electronically detected The use of the (3 x 3) coupler permits Passive Homodyne demodulation of the phase-modulated signals provided by the interferometer without feedback control or modulation of the laser itself and without requiring the use of electronics within the interferometer.

Descriptors :   *FIBER OPTICS, *OPTICAL INTERFEROMETERS, *DEMODULATORS, *PATENTS, OPTICAL EQUIPMENT, PRESSURE TRANSDUCERS, PASSIVE SYSTEMS, LASER BEAMS, LIGHT SOURCES, FEEDBACK, DEMODULATION, DIFFERENTIAL ANALYZERS, PHASE MODULATION, PHASE SHIFT, HOMODYNE RADIO RECEIVERS, WAVEGUIDE COUPLERS

Subject Categories : Fiber Optics and Integrated Optics

Distribution Statement : APPROVED FOR PUBLIC RELEASE