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:
Jun. 28, 1988
Filed:
Jun. 23, 1986
Michael R Layton, Newbury Park, CA (US);
Litton Systems, Inc., Beverly Hills, CA (US);
Abstract
Intensity modulated incoherent light is input to an interferometer. The interferometer is preferably formed to have a first arm comprising a first optical fiber and a second arm comprising a second optical fiber. The fibers have an initial optical pathlength difference .DELTA.L.sub.o. The refractive index of a selected one of the optical fibers is determined, and the output of the interferometer is monitored to detect a null signal output with an initial predetermined frequency resolution bandwidth. The initial length resolution is calculated, and the length of one of the fibers is reduced. The frequency resolution bandwidth is then reduced to a new predetermined value, and the frequency providing a null signal output at the new frequency resolution bandwidth is measured. The process is repeated until the pathlength difference becomes a predetermined value.