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:
Feb. 15, 2005
Filed:
Sep. 22, 2000
Hiromasa Ito, Sendai, JP;
Masato Yoshida, Sendai, JP;
Koichiro Nakamura, Sendai, JP;
Japan Science and Technology Agency, Saitama, JP;
Abstract
A group velocity dispersion measuring device capable of measuring group velocity dispersion (GVD) with a simple configuration and in a short time, comprising an FSF laser (FSFL) () for generating frequency chirp light, an optical amplifier (AMP) () for amplifying the frequency chirp light, an optical coupler (), a circulator () for branch-controlling optical signals, a photodetector () for receiving a ray of light before and after its propagation through an optical fiber () to be measured, and an RF spectrum analyzer (RFSA) () for observing an optical spectrum waveform. Beat signals generated between chirp lights before and after the propagation, through the optical fiber () to be measured, of frequency chirp light emitted from the FSF laser () are alternately observed to calculate a GVD value from frequency differences between these beat signals.