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. 03, 2013
Filed:
Apr. 10, 2012
Masatoshi Tokushima, Tokyo, JP;
Masatoshi Tokushima, Tokyo, JP;
NEC Corporation, Tokyo, JP;
Abstract
Disclosed is an optical delay element that makes use of a line-defect waveguide of a photonic crystal, in which long optical delay time and small group speed dispersion are rendered compatible with each other and in which waveform distortion that might otherwise be produced in processing an ultra-high speed signal is eliminated. Two line-defect waveguidesand, having different pillar diameters and group velocity dispersions of opposite signs, are interconnected by a line-defect waveguide, the pillar diameters of which are gradually varied from oneof the line-defect waveguides to the other line-defect waveguide, such as to compensate for group speed dispersion as well as to maintain an optical delay effect.