The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Dec. 28, 2004
Filed:
Oct. 31, 2001
Sidney M. Bennett, Chicago, IL (US);
KVH Industries, Inc., Middletown, RI (US);
Abstract
The invention comprises a system and method for reducing a shot noise component of the Angle Random Walk Noise in a fiber optic sensor by providing a first optical amplifier prior to the photodetector of the sensor to increase the power seen at the detector. An optical amplifier and second detector may be provided to detect a source sample, which can be useful in reducing RIN noise. Optical isolators may be added at the optical amplifiers to prevent rear facet emissions from the optical amplifiers from affecting sensor signals. A coupler with an isolator, amplifier and detector may be provided to receive a sample of the facet emissions from the first optical amplifier, which may be subtracted from the sensor signal at the detector so as to eliminate the facet emissions from the sensor signals. Polarizers may be provided prior to each detector to further eliminate emissions.