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:
Jul. 09, 2002
Filed:
Jun. 28, 2001
Hirohito Yamada, Tokyo, JP;
NEC Corporation, Tokyo, JP;
Abstract
A lightwave circuit, by which the degree of integration can be further improved by employing a multilayered structure of wiring, is disclosed. The disclosed photonic crystal multilayer substrate has portions, each portion having a slab-waveguide type photonic crystal structure, multilayered in the direction of the thickness of the substrate. In the photonic crystal structure, a photonic crystal layer is disposed between cladding layers; the photonic crystal layer is made of a photonic crystal having a two or three dimensional periodically modulated structure with respect to the effective refractive index in the order of optical wavelengths; and each cladding layer is made of a material whose effective refractive index differs from the effective refractive index of the photonic crystal layer.