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:
Nov. 05, 2002
Filed:
Sep. 24, 1999
Other;
Abstract
Emitted light from a light source is separated into two parts through an optical fiber coupler , one is entered in a measured optical module as measurement light, and the other is given a group delay by means of an optical fiber delay line , a reflector , etc., as local light signal, then the local light signal is combined with reflected light signal from the measured optical module through an optical fiber coupler and the reflected light signal and the local light signal are caused to interfere with each other. A polarization controller comprising a polarizer and a polarization rotation device for arbitrarily rotating the polarization state 0 degrees and 90 degrees at the time is used to generate beat signals at the polarization rotation angles, and the sum of the intensities of the beat signals is found, making it possible to measure the light power of the reflected light signal regardless of the polarization state of the local light signal or reflected light signal.