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:
Mar. 16, 2004
Filed:
May. 08, 2001
Gentaro Ishihara, Tokyo, JP;
Ando Electric Co., Ltd., Tokyo, JP;
Abstract
In a method of analyzing wavelength-division multiplexed signal light, a plurality of reference wavelengths (&lgr;C -&lgr;Cm) as preliminary specified by the ITU-T standards are stored in a memory; then, maximum points of light intensity are determined from waveform data obtained by measuring an actual wavelength-division multiplexed optical spectrum; any one of the maximum points which at least differs in light intensity from the two minimum points, one being right to said maximum point and the other being left, by at least a channel identifying threshold (TH) level is identified as a channel, and the wavelength of the identified channel is determined as &lgr;Dn; then, the &lgr;Dn for each channel is rounded to the value of the nearest ITU-T grid wavelength &lgr;Cm so as to determine the reference wavelength &lgr;An for each channel and the determined reference wavelengths &lgr;An are stored in the memory.